Bug 366333

Summary: Plasma-5 crash using sddm as login manager using "users switch".
Product: [Plasma] plasmashell Reporter: Sandro <alcerb1972>
Component: generalAssignee: David Edmundson <kde>
Status: RESOLVED FIXED    
Severity: critical CC: bshah, cfeck, plasma-bugs-null, sheedy
Priority: NOR    
Version First Reported In: 5.1.1   
Target Milestone: 1.0   
Platform: Gentoo Packages   
OS: Linux   
Latest Commit: Version Fixed In:
Sentry Crash Report:

Description Sandro 2016-08-01 19:48:10 UTC 
Example:
If I open a session (plasma-5 on Funtoo Linux "Stable" 64 bits" with my user;
Then I switch to another user;
Then I close the 2nd session;
I obtain error (graphical system crashes).

There is a message but for systemd i think.

But My Funtoo uses OpenRC.

I had this trouble also with plasma-4 with kdm as login manager.

I use nvidia-drivers (proprietary from the "Portage").

Thanx. 

Reproducible: Always



Expected Results:  
plasma5 doesn't crash whit multisession.

kernel 4.4.6 (gentoo-sources)
Comment 1 Christoph Feck 2016-08-02 12:15:49 UTC 
> graphical system crashes

Which process crashes? If it is indeed the plasmashell process, please add the backtrace. For more information, please see https://techbase.kde.org/Development/Tutorials/Debugging/How_to_create_useful_crash_reports

If the the X11 server process crashes, the bug is most likely in the video drivers, and you would need to report it to their developers via https://bugs.freedesktop.org/
Comment 2 Sandro 2016-08-02 16:49:36 UTC 
Now i try with "nouveau" drivers ; to see if the error is caused by "proprietary nvidia-drivers" _'_
Comment 3 Sandro 2016-08-02 18:02:26 UTC 
I tried it with the drivers nouveau.
But with nouveau i've some troubles.
Then i think may be better to focus on my (and others) systems with the nvidia-drivers; i have necessity to use nvidia-drivers because I have to be able to use technology "cuda" & "OpenCL".
Some time ago I have already reported in the nvidia forum my problem.
But there was no answer.

Since my system is Funtoo (similar to Gentoo) , i give You a link with my configuration files: 

https://github.com/Sandro1972/My_Funtoo_config_files_and_Scripts/

I've build my system using those config_files ..... _'_
Comment 4 Sandro 2016-08-02 20:02:01 UTC 
Ok ... Now i'm experimenting lightdm as login manager; it seems to works fine.
Comment 5 Sandro 2016-08-02 20:12:41 UTC 
No ... also with entrance i obtain errors.
Comment 6 Christoph Feck 2016-08-03 12:25:03 UTC 
The information which process has actually crashed is still missing.
Comment 7 Sandro 2016-08-03 16:25:38 UTC 
Excuse me I'm not an expert user.

1) I see on screen:
_______________________________________________________________________________
* Il blocco dello schermo non è più possibile.
* Per sbloccare, passa a un terminale virtuale (e.g. Ctrl + Alt + F2)
* Accedi ed esegui il comando:
*** loginctl unblock-session (but it is not present in my system)
* Successivamente, torna alla sessione in esecuzione (Ctrl + Alt+ F7).
______________________________________________________________________________


2) /var/log/messages:

Aug  3 18:07:10 localhost syslog-ng[9245]: syslog-ng starting up; version='3.7.3'
Aug  3 18:07:17 localhost su[9210]: pam_unix(su:session): session closed for user root
Aug  3 18:07:27 localhost root[9273]: ACPI event unhandled: jack/lineout LINEOUT unplug
Aug  3 18:07:27 localhost root[9276]: ACPI event unhandled: jack/videoout VIDEOOUT unplug
Aug  3 18:07:27 localhost acpid[3539]: client 8830[0:0] has disconnected
Aug  3 18:07:27 localhost acpid[3539]: client connected from 9268[0:0]
Aug  3 18:07:27 localhost acpid[3539]: 1 client rule loaded
Aug  3 18:07:27 localhost kernel: snd_hda_codec_hdmi hdaudioC1D0: HDMI: invalid ELD data byte 6
Aug  3 18:07:28 localhost sddm-helper[9282]: PAM unable to dlopen(/lib64/security/pam_systemd.so): /lib64/security/pam_systemd.so: cannot open shared object file: No such file or directory
Aug  3 18:07:28 localhost sddm-helper[9282]: PAM adding faulty module: /lib64/security/pam_systemd.so
Aug  3 18:07:28 localhost sddm-helper[9282]: pam_unix(sddm-greeter:session): session opened for user sddm by (uid=0)
Aug  3 18:07:28 localhost root[9319]: ACPI event unhandled: jack/lineout LINEOUT plug
Aug  3 18:07:28 localhost root[9321]: ACPI event unhandled: jack/videoout VIDEOOUT plug
Aug  3 18:07:35 localhost sddm-helper[9344]: pam_kwallet(sddm:auth): (null): pam_sm_authenticate
Aug  3 18:07:35 localhost sddm-helper[9344]: pam_kwallet5(sddm:auth): (null): pam_sm_authenticate
Aug  3 18:07:35 localhost sddm-helper[9344]: pam_kwallet(sddm:setcred): pam_kwallet: pam_sm_setcred
Aug  3 18:07:35 localhost sddm-helper[9344]: pam_kwallet5(sddm:setcred): pam_kwallet5: pam_sm_setcred
Aug  3 18:07:35 localhost sddm-helper[9344]: pam_unix(sddm:session): session opened for user vincio by (uid=0)
Aug  3 18:07:35 localhost sddm-helper[9344]: pam_ck_connector(sddm:session): nox11 mode, ignoring PAM_TTY :1
Aug  3 18:07:35 localhost sddm-helper[9344]: pam_kwallet(sddm:session): pam_kwallet: pam_sm_open_session
Aug  3 18:07:35 localhost sddm-helper[9344]: pam_kwallet(sddm:session): pam_kwallet: final socket path: /tmp/kwallet_vincio.socket
Aug  3 18:07:35 localhost sddm-helper[9344]: pam_kwallet5(sddm:session): pam_kwallet5: pam_sm_open_session
Aug  3 18:07:35 localhost sddm-helper[9344]: pam_kwallet5(sddm:session): pam_kwallet5: final socket path: /tmp/kwallet5_vincio.socket
Aug  3 18:07:35 localhost dbus[3569]: [system] Activating service name='org.kde.powerdevil.backlighthelper' (using servicehelper)
Aug  3 18:07:35 localhost dbus[3569]: [system] Successfully activated service 'org.kde.powerdevil.backlighthelper'
Aug  3 18:07:36 localhost polkitd[3647]: Registered Authentication Agent for unix-session:/org/freedesktop/ConsoleKit/Session20 (system bus name :1.226 [/usr/lib64/libexec/polkit-kde-authentication-agent-1], object path /org/kde/PolicyKit1/AuthenticationAgent, locale it_IT.UTF-8)
Aug  3 18:07:36 localhost pulseaudio[9593]: [pulseaudio] main.c: Compiled with DEPRECATED libsamplerate support!
Aug  3 18:07:36 localhost pulseaudio[9593]: [pulseaudio] pid.c: Stale PID file, overwriting.
Aug  3 18:07:37 localhost obexd[9636]: OBEX daemon 5.39
Aug  3 18:07:37 localhost pulseaudio[9661]: [pulseaudio] main.c: Compiled with DEPRECATED libsamplerate support!
Aug  3 18:07:37 localhost pulseaudio[9661]: [pulseaudio] pid.c: Daemon already running.
Aug  3 18:07:37 localhost pulseaudio[9667]: [pulseaudio] main.c: Compiled with DEPRECATED libsamplerate support!
Aug  3 18:07:37 localhost pulseaudio[9667]: [pulseaudio] pid.c: Daemon already running.
Aug  3 18:08:03 localhost polkitd[3647]: Unregistered Authentication Agent for unix-session:/org/freedesktop/ConsoleKit/Session20 (system bus name :1.226, object path /org/kde/PolicyKit1/AuthenticationAgent, locale it_IT.UTF-8)
Aug  3 18:08:05 localhost kernel: kactivitymanage[9452]: segfault at 7f9ac9942c50 ip 00007f9aa2d82e31 sp 00007fffff4241a8 error 4 in libQt5Sql.so.5.6.1[7f9aa2d6e000+41000]
Aug  3 18:08:06 localhost root[9726]: ACPI event unhandled: jack/lineout LINEOUT unplug
Aug  3 18:08:06 localhost root[9729]: ACPI event unhandled: jack/videoout VIDEOOUT unplug
Aug  3 18:08:06 localhost acpid[3539]: client 9268[0:0] has disconnected
Aug  3 18:08:06 localhost acpid[3539]: client connected from 8830[0:0]
Aug  3 18:08:06 localhost acpid[3539]: 1 client rule loaded
Aug  3 18:08:06 localhost root[9746]: ACPI event unhandled: jack/lineout LINEOUT plug
Aug  3 18:08:06 localhost root[9748]: ACPI event unhandled: jack/videoout VIDEOOUT plug
Aug  3 18:08:30 localhost root[9829]: ACPI event unhandled: jack/lineout LINEOUT unplug
Aug  3 18:08:30 localhost root[9832]: ACPI event unhandled: jack/videoout VIDEOOUT unplug
Aug  3 18:08:30 localhost acpid[3539]: client 8830[0:0] has disconnected
Aug  3 18:08:30 localhost acpid[3539]: client connected from 9826[0:0]
Aug  3 18:08:30 localhost acpid[3539]: 1 client rule loaded
Aug  3 18:08:30 localhost kernel: snd_hda_codec_hdmi hdaudioC1D0: HDMI: invalid ELD data byte 9
Aug  3 18:08:30 localhost sddm-helper[9837]: PAM unable to dlopen(/lib64/security/pam_systemd.so): /lib64/security/pam_systemd.so: cannot open shared object file: No such file or directory
Aug  3 18:08:30 localhost sddm-helper[9837]: PAM adding faulty module: /lib64/security/pam_systemd.so
Aug  3 18:08:30 localhost sddm-helper[9837]: pam_unix(sddm-greeter:session): session opened for user sddm by (uid=0)
Aug  3 18:08:30 localhost root[9879]: ACPI event unhandled: jack/lineout LINEOUT plug
Aug  3 18:08:30 localhost root[9881]: ACPI event unhandled: jack/videoout VIDEOOUT plug
Aug  3 18:08:38 localhost sddm-helper[9914]: pam_kwallet(sddm:auth): (null): pam_sm_authenticate
Aug  3 18:08:38 localhost sddm-helper[9914]: pam_kwallet5(sddm:auth): (null): pam_sm_authenticate
Aug  3 18:08:38 localhost sddm-helper[9914]: pam_kwallet(sddm:setcred): pam_kwallet: pam_sm_setcred
Aug  3 18:08:38 localhost sddm-helper[9914]: pam_kwallet5(sddm:setcred): pam_kwallet5: pam_sm_setcred
Aug  3 18:08:38 localhost sddm-helper[9914]: pam_unix(sddm:session): session opened for user vincio by (uid=0)
Aug  3 18:08:38 localhost sddm-helper[9914]: pam_ck_connector(sddm:session): nox11 mode, ignoring PAM_TTY :1
Aug  3 18:08:38 localhost sddm-helper[9914]: pam_kwallet(sddm:session): pam_kwallet: pam_sm_open_session
Aug  3 18:08:38 localhost sddm-helper[9914]: pam_kwallet(sddm:session): pam_kwallet: final socket path: /tmp/kwallet_vincio.socket
Aug  3 18:08:38 localhost sddm-helper[9914]: pam_kwallet5(sddm:session): pam_kwallet5: pam_sm_open_session
Aug  3 18:08:38 localhost sddm-helper[9914]: pam_kwallet5(sddm:session): pam_kwallet5: final socket path: /tmp/kwallet5_vincio.socket
Aug  3 18:08:39 localhost dbus[3569]: [system] Activating service name='org.kde.powerdevil.backlighthelper' (using servicehelper)
Aug  3 18:08:39 localhost dbus[3569]: [system] Successfully activated service 'org.kde.powerdevil.backlighthelper'
Aug  3 18:08:39 localhost polkitd[3647]: Registered Authentication Agent for unix-session:/org/freedesktop/ConsoleKit/Session21 (system bus name :1.249 [/usr/lib64/libexec/polkit-kde-authentication-agent-1], object path /org/kde/PolicyKit1/AuthenticationAgent, locale it_IT.UTF-8)
Aug  3 18:08:39 localhost pulseaudio[10163]: [pulseaudio] main.c: Compiled with DEPRECATED libsamplerate support!
Aug  3 18:08:40 localhost obexd[10204]: OBEX daemon 5.39
Aug  3 18:08:41 localhost pulseaudio[10230]: [pulseaudio] main.c: Compiled with DEPRECATED libsamplerate support!
Aug  3 18:08:41 localhost pulseaudio[10230]: [pulseaudio] pid.c: Daemon already running.
Aug  3 18:08:41 localhost pulseaudio[10236]: [pulseaudio] main.c: Compiled with DEPRECATED libsamplerate support!
Aug  3 18:08:41 localhost pulseaudio[10236]: [pulseaudio] pid.c: Daemon already running.
Aug  3 18:09:01 localhost polkitd[3647]: Unregistered Authentication Agent for unix-session:/org/freedesktop/ConsoleKit/Session21 (system bus name :1.249, object path /org/kde/PolicyKit1/AuthenticationAgent, locale it_IT.UTF-8)
Aug  3 18:09:03 localhost kernel: kactivitymanage[10022]: segfault at 7f3aa4d57c50 ip 00007f3a8618fe31 sp 00007ffdb8f31018 error 4 in libQt5Sql.so.5.6.1[7f3a8617b000+41000]
Aug  3 18:09:04 localhost root[10479]: ACPI event unhandled: jack/lineout LINEOUT unplug
Aug  3 18:09:04 localhost root[10481]: ACPI event unhandled: jack/videoout VIDEOOUT unplug
Aug  3 18:09:04 localhost acpid[3539]: client 9826[0:0] has disconnected
Aug  3 18:09:04 localhost acpid[3539]: client connected from 8830[0:0]
Aug  3 18:09:04 localhost acpid[3539]: 1 client rule loaded
Aug  3 18:09:04 localhost root[10504]: ACPI event unhandled: jack/lineout LINEOUT plug
Aug  3 18:09:04 localhost root[10507]: ACPI event unhandled: jack/videoout VIDEOOUT plug
Aug  3 18:10:01 localhost cron[10564]: (root) CMD (test -x /usr/sbin/run-crons && /usr/sbin/run-crons)
Aug  3 18:12:36 localhost root[10586]: ACPI event unhandled: jack/lineout LINEOUT unplug
Aug  3 18:12:36 localhost root[10589]: ACPI event unhandled: jack/videoout VIDEOOUT unplug
Aug  3 18:12:36 localhost acpid[3539]: client 8830[0:0] has disconnected
Aug  3 18:12:45 localhost login[5626]: pam_unix(login:session): session opened for user root by LOGIN(uid=0)
Aug  3 18:12:45 localhost login[10612]: ROOT LOGIN  on '/dev/tty3'
Aug  3 18:12:50 localhost kernel: kactivitymanage[8985]: segfault at 7f9604691c50 ip 00007f95ec12ce31 sp 00007fff866b6738 error 4 in libQt5Sql.so.5.6.1[7f95ec118000+41000]
Aug  3 18:12:50 localhost polkitd[3647]: Unregistered Authentication Agent for unix-session:/org/freedesktop/ConsoleKit/Session19 (system bus name :1.200, object path /org/kde/PolicyKit1/AuthenticationAgent, locale it_IT.UTF-8) (disconnected from bus)
Aug  3 18:12:51 localhost kernel: nvidia-modeset: Freed GPU:0 (GPU-da0edd0e-9bb0-26db-cafe-55755ae8c63f) @ PCI:0000:01:00.0

_________________________________________________________________________--

3) cat /var/log/Xorg.0.log
[  1030.951] _XSERVTransSocketUNIXCreateListener: ...SocketCreateListener() failed
[  1030.951] _XSERVTransMakeAllCOTSServerListeners: server already running
[  1030.951] 
X.Org X Server 1.16.4
Release Date: 2014-12-20
[  1030.951] X Protocol Version 11, Revision 0
[  1030.951] Build Operating System: Linux 4.4.6-gentoo x86_64 Gentoo
[  1030.951] Current Operating System: Linux ci74771ht 4.4.6-gentoo #1 SMP PREEMPT Tue Aug 2 19:22:05 CEST 2016 x86_64
[  1030.951] Kernel command line: BOOT_IMAGE=/kernel-genkernel-x86_64-4.4.6-gentoo rootfstype=auto real_root=/dev/sda6 rootfstype=ext4
[  1030.951] Build Date: 31 July 2016  01:03:11AM
[  1030.951]  
[  1030.951] Current version of pixman: 0.32.8
[  1030.951]    Before reporting problems, check http://wiki.x.org
        to make sure that you have the latest version.
[  1030.951] Markers: (--) probed, (**) from config file, (==) default setting,
        (++) from command line, (!!) notice, (II) informational,
        (WW) warning, (EE) error, (NI) not implemented, (??) unknown.
[  1030.951] (==) Log file: "/var/log/Xorg.0.log", Time: Wed Aug  3 18:08:30 2016
[  1030.951] (==) Using config file: "/etc/X11/xorg.conf"
[  1030.951] (==) Using config directory: "/etc/X11/xorg.conf.d"
[  1030.951] (==) Using system config directory "/usr/share/X11/xorg.conf.d"
[  1030.951] (==) ServerLayout "X.org Configured"
[  1030.951] (**) |-->Screen "Screen0" (0)
[  1030.951] (**) |   |-->Monitor "Monitor0"
[  1030.951] (**) |   |-->Device "Card0"
[  1030.951] (**) |-->Input Device "Mouse0"
[  1030.951] (**) |-->Input Device "Keyboard0"
[  1030.951] (==) Automatically adding devices
[  1030.951] (==) Automatically enabling devices
[  1030.951] (==) Automatically adding GPU devices
[  1030.951] (**) FontPath set to:
        /usr/share/fonts/misc/,
        /usr/share/fonts/TTF/,
        /usr/share/fonts/OTF/,
        /usr/share/fonts/Type1/,
        /usr/share/fonts/100dpi/,
        /usr/share/fonts/75dpi/,
        /usr/share/fonts/misc/,
        /usr/share/fonts/TTF/,
        /usr/share/fonts/OTF/,
        /usr/share/fonts/Type1/,
        /usr/share/fonts/100dpi/,
        /usr/share/fonts/75dpi/
[  1030.951] (**) ModulePath set to "/usr/lib64/opengl/nvidia,/usr/lib64/xorg/modules,/usr/lib64/xorg/modules"
[  1030.951] (WW) Hotplugging is on, devices using drivers 'kbd', 'mouse' or 'vmmouse' will be disabled.
[  1030.951] (WW) Disabling Mouse0
[  1030.951] (WW) Disabling Keyboard0
[  1030.951] (II) Loader magic: 0x8088c0
[  1030.951] (II) Module ABI versions:
[  1030.951]    X.Org ANSI C Emulation: 0.4
[  1030.951]    X.Org Video Driver: 18.0
[  1030.951]    X.Org XInput driver : 21.0
[  1030.951]    X.Org Server Extension : 8.0
[  1030.952] (II) xfree86: Adding drm device (/dev/dri/card0)
[  1030.952] (--) PCI:*(0:1:0:0) 10de:11c0:1462:2872 rev 161, Mem @ 0xde000000/16777216, 0xd0000000/134217728, 0xd8000000/33554432, I/O @ 0x0000e000/128, BIOS @ 0x????????/524288
[  1030.952] (II) "glx" will be loaded. This was enabled by default and also specified in the config file.
[  1030.952] (II) LoadModule: "glx"
[  1030.952] (II) Loading /usr/lib64/opengl/nvidia/extensions/libglx.so
[  1030.955] (II) Module glx: vendor="NVIDIA Corporation"
[  1030.955]    compiled for 4.0.2, module version = 1.0.0
[  1030.955]    Module class: X.Org Server Extension
[  1030.955] (II) NVIDIA GLX Module  367.35  Mon Jul 11 22:39:07 PDT 2016
[  1030.955] (II) LoadModule: "nvidia"
[  1030.955] (II) Loading /usr/lib64/xorg/modules/drivers/nvidia_drv.so
[  1030.955] (II) Module nvidia: vendor="NVIDIA Corporation"
[  1030.955]    compiled for 4.0.2, module version = 1.0.0
[  1030.955]    Module class: X.Org Video Driver
[  1030.955] (II) NVIDIA dlloader X Driver  367.35  Mon Jul 11 22:14:48 PDT 2016
[  1030.955] (II) NVIDIA Unified Driver for all Supported NVIDIA GPUs
[  1030.955] (++) using VT number 8

[  1031.287] (II) Loading sub module "fb"
[  1031.287] (II) LoadModule: "fb"
[  1031.287] (II) Loading /usr/lib64/xorg/modules/libfb.so
[  1031.287] (II) Module fb: vendor="X.Org Foundation"
[  1031.287]    compiled for 1.16.4, module version = 1.0.0
[  1031.287]    ABI class: X.Org ANSI C Emulation, version 0.4
[  1031.287] (II) Loading sub module "wfb"
[  1031.287] (II) LoadModule: "wfb"
[  1031.287] (II) Loading /usr/lib64/xorg/modules/libwfb.so
[  1031.287] (II) Module wfb: vendor="X.Org Foundation"
[  1031.287]    compiled for 1.16.4, module version = 1.0.0
[  1031.287]    ABI class: X.Org ANSI C Emulation, version 0.4
[  1031.287] (II) Loading sub module "ramdac"
[  1031.287] (II) LoadModule: "ramdac"
[  1031.287] (II) Module "ramdac" already built-in
[  1031.287] (==) NVIDIA(0): Depth 24, (==) framebuffer bpp 32
[  1031.287] (==) NVIDIA(0): RGB weight 888
[  1031.287] (==) NVIDIA(0): Default visual is TrueColor
[  1031.287] (==) NVIDIA(0): Using gamma correction (1.0, 1.0, 1.0)
[  1031.287] (**) NVIDIA(0): Option "TripleBuffer" "True"
[  1031.287] (**) NVIDIA(0): Enabling 2D acceleration
[  1031.292] (--) NVIDIA(0): Valid display device(s) on GPU-0 at PCI:1:0:0
[  1031.292] (--) NVIDIA(0):     CRT-0
[  1031.292] (--) NVIDIA(0):     DFP-0
[  1031.292] (--) NVIDIA(0):     DFP-1 (boot)
[  1031.292] (--) NVIDIA(0):     DFP-2
[  1031.292] (--) NVIDIA(0):     DFP-3
[  1031.292] (--) NVIDIA(0):     DFP-4
[  1031.295] (--) NVIDIA(0): CRT-0: disconnected
[  1031.295] (--) NVIDIA(0): CRT-0: 400.0 MHz maximum pixel clock
[  1031.295] (--) NVIDIA(0): 
[  1031.298] (--) NVIDIA(0): DFP-0: disconnected
[  1031.298] (--) NVIDIA(0): DFP-0: Internal TMDS
[  1031.298] (--) NVIDIA(0): DFP-0: 330.0 MHz maximum pixel clock
[  1031.298] (--) NVIDIA(0): 
[  1031.322] (--) NVIDIA(0): Philips PHL 274E5 (DFP-1): connected
[  1031.323] (--) NVIDIA(0): Philips PHL 274E5 (DFP-1): Internal TMDS
[  1031.323] (--) NVIDIA(0): Philips PHL 274E5 (DFP-1): 340.0 MHz maximum pixel clock
[  1031.323] (--) NVIDIA(0): 
[  1031.323] (--) NVIDIA(0): DFP-2: disconnected
[  1031.323] (--) NVIDIA(0): DFP-2: Internal TMDS
[  1031.323] (--) NVIDIA(0): DFP-2: 165.0 MHz maximum pixel clock
[  1031.323] (--) NVIDIA(0): 
[  1031.323] (--) NVIDIA(0): DFP-3: disconnected
[  1031.323] (--) NVIDIA(0): DFP-3: Internal TMDS
[  1031.323] (--) NVIDIA(0): DFP-3: 330.0 MHz maximum pixel clock
[  1031.323] (--) NVIDIA(0): 
[  1031.323] (--) NVIDIA(0): DFP-4: disconnected
[  1031.323] (--) NVIDIA(0): DFP-4: Internal DisplayPort
[  1031.323] (--) NVIDIA(0): DFP-4: 960.0 MHz maximum pixel clock
[  1031.323] (--) NVIDIA(0): 
[  1031.325] (II) NVIDIA(0): NVIDIA GPU GeForce GTX 660 (GK106) at PCI:1:0:0 (GPU-0)
[  1031.325] (--) NVIDIA(0): Memory: 2097152 kBytes
[  1031.325] (--) NVIDIA(0): VideoBIOS: 80.06.10.00.85
[  1031.325] (II) NVIDIA(0): Detected PCI Express Link width: 16X
[  1031.325] (**) NVIDIA(0): Using HorizSync/VertRefresh ranges from the EDID for display
[  1031.325] (**) NVIDIA(0):     device Philips PHL 274E5 (DFP-1) (Using EDID frequencies
[  1031.325] (**) NVIDIA(0):     has been enabled on all display devices.)
[  1031.327] (==) NVIDIA(0): 
[  1031.327] (==) NVIDIA(0): No modes were requested; the default mode "nvidia-auto-select"
[  1031.327] (==) NVIDIA(0):     will be used as the requested mode.
[  1031.327] (==) NVIDIA(0): 
[  1031.327] (II) NVIDIA(0): Validated MetaModes:
[  1031.327] (II) NVIDIA(0):     "DFP-1:nvidia-auto-select"
[  1031.327] (II) NVIDIA(0): Virtual screen size determined to be 1920 x 1080
[  1031.334] (--) NVIDIA(0): DPI set to (81, 80); computed from "UseEdidDpi" X config
[  1031.334] (--) NVIDIA(0):     option
[  1031.334] (--) Depth 24 pixmap format is 32 bpp
[  1031.334] (II) NVIDIA: Using 12288.00 MB of virtual memory for indirect memory
[  1031.334] (II) NVIDIA:     access.
[  1031.352] (II) NVIDIA(0): Setting mode "DFP-1:nvidia-auto-select"
[  1031.396] (==) NVIDIA(0): Disabling shared memory pixmaps
[  1031.396] (==) NVIDIA(0): Backing store enabled
[  1031.396] (==) NVIDIA(0): Silken mouse enabled
[  1031.396] (==) NVIDIA(0): DPMS enabled
[  1031.396] (II) Loading sub module "dri2"
[  1031.396] (II) LoadModule: "dri2"
[  1031.396] (II) Module "dri2" already built-in
[  1031.396] (II) NVIDIA(0): [DRI2] Setup complete
[  1031.396] (II) NVIDIA(0): [DRI2]   VDPAU driver: nvidia
[  1031.396] (--) RandR disabled
[  1031.399] (II) Initializing extension GLX
[  1031.482] (II) config/udev: Adding input device Power Button (/dev/input/event1)
[  1031.482] (**) Power Button: Applying InputClass "evdev keyboard catchall"
[  1031.482] (**) Power Button: Applying InputClass "Keyboard0"
[  1031.482] (II) LoadModule: "evdev"
[  1031.482] (II) Loading /usr/lib64/xorg/modules/input/evdev_drv.so
[  1031.482] (II) Module evdev: vendor="X.Org Foundation"
[  1031.482]    compiled for 1.16.4, module version = 2.9.2
[  1031.482]    Module class: X.Org XInput Driver
[  1031.482]    ABI class: X.Org XInput driver, version 21.0
[  1031.482] (II) Using input driver 'evdev' for 'Power Button'
[  1031.482] (**) Power Button: always reports core events
[  1031.482] (**) evdev: Power Button: Device: "/dev/input/event1"
[  1031.482] (--) evdev: Power Button: Vendor 0 Product 0x1
[  1031.482] (--) evdev: Power Button: Found keys
[  1031.482] (II) evdev: Power Button: Configuring as keyboard
[  1031.482] (**) Option "config_info" "udev:/sys/devices/LNXSYSTM:00/LNXPWRBN:00/input/input1/event1"
[  1031.482] (II) XINPUT: Adding extended input device "Power Button" (type: KEYBOARD, id 6)
[  1031.482] (**) Option "xkb_rules" "evdev"
[  1031.482] (**) Option "xkb_model" "pc104"
[  1031.482] (**) Option "xkb_layout" "it"
[  1031.494] (II) config/udev: Adding input device Power Button (/dev/input/event0)
[  1031.494] (**) Power Button: Applying InputClass "evdev keyboard catchall"
[  1031.494] (**) Power Button: Applying InputClass "Keyboard0"
[  1031.494] (II) Using input driver 'evdev' for 'Power Button'
[  1031.494] (**) Power Button: always reports core events
[  1031.494] (**) evdev: Power Button: Device: "/dev/input/event0"
[  1031.494] (--) evdev: Power Button: Vendor 0 Product 0x1
[  1031.494] (--) evdev: Power Button: Found keys
[  1031.494] (II) evdev: Power Button: Configuring as keyboard
[  1031.494] (**) Option "config_info" "udev:/sys/devices/LNXSYSTM:00/LNXSYBUS:00/PNP0C0C:00/input/input0/event0"
[  1031.494] (II) XINPUT: Adding extended input device "Power Button" (type: KEYBOARD, id 7)
[  1031.494] (**) Option "xkb_rules" "evdev"
[  1031.494] (**) Option "xkb_model" "pc104"
[  1031.494] (**) Option "xkb_layout" "it"
[  1031.494] (II) config/udev: Adding input device HDA NVidia HDMI/DP,pcm=3 (/dev/input/event4)
[  1031.494] (**) HDA NVidia HDMI/DP,pcm=3: Applying InputClass "Keyboard0"
[  1031.494] (II) No input driver specified, ignoring this device.
[  1031.494] (II) This device may have been added with another device file.
[  1031.494] (II) config/udev: Adding input device HDA NVidia HDMI/DP,pcm=7 (/dev/input/event5)
[  1031.494] (**) HDA NVidia HDMI/DP,pcm=7: Applying InputClass "Keyboard0"
[  1031.494] (II) No input driver specified, ignoring this device.
[  1031.494] (II) This device may have been added with another device file.
[  1031.494] (II) config/udev: Adding input device HDA NVidia HDMI/DP,pcm=8 (/dev/input/event6)
[  1031.494] (**) HDA NVidia HDMI/DP,pcm=8: Applying InputClass "Keyboard0"
[  1031.494] (II) No input driver specified, ignoring this device.
[  1031.494] (II) This device may have been added with another device file.
[  1031.494] (II) config/udev: Adding input device HDA NVidia HDMI/DP,pcm=9 (/dev/input/event7)
[  1031.494] (**) HDA NVidia HDMI/DP,pcm=9: Applying InputClass "Keyboard0"
[  1031.494] (II) No input driver specified, ignoring this device.
[  1031.494] (II) This device may have been added with another device file.
[  1031.495] (II) config/udev: Adding input device A4Tech USB Full Speed (/dev/input/event16)
[  1031.495] (**) A4Tech USB Full Speed: Applying InputClass "evdev pointer catchall"
[  1031.495] (**) A4Tech USB Full Speed: Applying InputClass "Keyboard0"
[  1031.495] (II) Using input driver 'evdev' for 'A4Tech USB Full Speed'
[  1031.495] (**) A4Tech USB Full Speed: always reports core events
[  1031.495] (**) evdev: A4Tech USB Full Speed: Device: "/dev/input/event16"
[  1031.546] (--) evdev: A4Tech USB Full Speed: Vendor 0x9da Product 0x8090
[  1031.546] (--) evdev: A4Tech USB Full Speed: Found 20 mouse buttons
[  1031.546] (--) evdev: A4Tech USB Full Speed: Found scroll wheel(s)
[  1031.546] (--) evdev: A4Tech USB Full Speed: Found relative axes
[  1031.546] (--) evdev: A4Tech USB Full Speed: Found x and y relative axes
[  1031.546] (II) evdev: A4Tech USB Full Speed: Configuring as mouse
[  1031.546] (II) evdev: A4Tech USB Full Speed: Adding scrollwheel support
[  1031.546] (**) evdev: A4Tech USB Full Speed: YAxisMapping: buttons 4 and 5
[  1031.546] (**) evdev: A4Tech USB Full Speed: EmulateWheelButton: 4, EmulateWheelInertia: 10, EmulateWheelTimeout: 200
[  1031.546] (**) Option "config_info" "udev:/sys/devices/pci0000:00/0000:00:14.0/usb3/3-10/3-10:1.0/0003:09DA:8090.0002/input/input16/event16"
[  1031.546] (II) XINPUT: Adding extended input device "A4Tech USB Full Speed" (type: MOUSE, id 8)
[  1031.546] (II) evdev: A4Tech USB Full Speed: initialized for relative axes.
[  1031.546] (**) A4Tech USB Full Speed: (accel) keeping acceleration scheme 1
[  1031.546] (**) A4Tech USB Full Speed: (accel) acceleration profile 0
[  1031.546] (**) A4Tech USB Full Speed: (accel) acceleration factor: 2.000
[  1031.546] (**) A4Tech USB Full Speed: (accel) acceleration threshold: 4
[  1031.546] (II) config/udev: Adding input device A4Tech USB Full Speed (/dev/input/mouse0)
[  1031.546] (**) A4Tech USB Full Speed: Applying InputClass "Keyboard0"
[  1031.546] (II) No input driver specified, ignoring this device.
[  1031.546] (II) This device may have been added with another device file.
[  1031.546] (II) config/udev: Adding input device A4Tech USB Full Speed (/dev/input/event17)
[  1031.546] (**) A4Tech USB Full Speed: Applying InputClass "evdev keyboard catchall"
[  1031.546] (**) A4Tech USB Full Speed: Applying InputClass "Keyboard0"
[  1031.546] (II) Using input driver 'evdev' for 'A4Tech USB Full Speed'
[  1031.546] (**) A4Tech USB Full Speed: always reports core events
[  1031.546] (**) evdev: A4Tech USB Full Speed: Device: "/dev/input/event17"
[  1031.546] (--) evdev: A4Tech USB Full Speed: Vendor 0x9da Product 0x8090
[  1031.547] (--) evdev: A4Tech USB Full Speed: Found 1 mouse buttons
[  1031.547] (--) evdev: A4Tech USB Full Speed: Found scroll wheel(s)
[  1031.547] (--) evdev: A4Tech USB Full Speed: Found relative axes
[  1031.547] (--) evdev: A4Tech USB Full Speed: Found absolute axes
[  1031.547] (--) evdev: A4Tech USB Full Speed: Found absolute multitouch axes
[  1031.547] (--) evdev: A4Tech USB Full Speed: Found x and y absolute axes
[  1031.547] (--) evdev: A4Tech USB Full Speed: Found keys
[  1031.547] (II) evdev: A4Tech USB Full Speed: Forcing relative x/y axes to exist.
[  1031.547] (II) evdev: A4Tech USB Full Speed: Configuring as mouse
[  1031.547] (II) evdev: A4Tech USB Full Speed: Configuring as keyboard
[  1031.547] (II) evdev: A4Tech USB Full Speed: Adding scrollwheel support
[  1031.547] (**) evdev: A4Tech USB Full Speed: YAxisMapping: buttons 4 and 5
[  1031.547] (**) evdev: A4Tech USB Full Speed: EmulateWheelButton: 4, EmulateWheelInertia: 10, EmulateWheelTimeout: 200
[  1031.547] (**) Option "config_info" "udev:/sys/devices/pci0000:00/0000:00:14.0/usb3/3-10/3-10:1.1/0003:09DA:8090.0003/input/input17/event17"
[  1031.547] (II) XINPUT: Adding extended input device "A4Tech USB Full Speed" (type: KEYBOARD, id 9)
[  1031.547] (**) Option "xkb_rules" "evdev"
[  1031.547] (**) Option "xkb_model" "pc104"
[  1031.547] (**) Option "xkb_layout" "it"
[  1031.547] (II) evdev: A4Tech USB Full Speed: initialized for relative axes.
[  1031.547] (WW) evdev: A4Tech USB Full Speed: ignoring absolute axes.
[  1031.547] (**) A4Tech USB Full Speed: (accel) keeping acceleration scheme 1
[  1031.547] (**) A4Tech USB Full Speed: (accel) acceleration profile 0
[  1031.547] (**) A4Tech USB Full Speed: (accel) acceleration factor: 2.000
[  1031.547] (**) A4Tech USB Full Speed: (accel) acceleration threshold: 4
[  1031.547] (II) config/udev: Adding input device A4Tech USB Full Speed (/dev/input/js0)
[  1031.547] (**) A4Tech USB Full Speed: Applying InputClass "Keyboard0"
[  1031.547] (II) No input driver specified, ignoring this device.
[  1031.547] (II) This device may have been added with another device file.
[  1031.547] (II) config/udev: Adding input device Microsoft® LifeCam HD-3000 (/dev/input/event15)
[  1031.547] (**) Microsoft® LifeCam HD-3000: Applying InputClass "evdev keyboard catchall"
[  1031.547] (**) Microsoft® LifeCam HD-3000: Applying InputClass "Keyboard0"
[  1031.547] (II) Using input driver 'evdev' for 'Microsoft® LifeCam HD-3000'
[  1031.547] (**) Microsoft® LifeCam HD-3000: always reports core events
[  1031.547] (**) evdev: Microsoft® LifeCam HD-3000: Device: "/dev/input/event15"
[  1031.547] (--) evdev: Microsoft® LifeCam HD-3000: Vendor 0x45e Product 0x779
[  1031.547] (--) evdev: Microsoft® LifeCam HD-3000: Found keys
[  1031.547] (II) evdev: Microsoft® LifeCam HD-3000: Configuring as keyboard
[  1031.547] (**) Option "config_info" "udev:/sys/devices/pci0000:00/0000:00:14.0/usb3/3-14/3-14:1.0/input/input15/event15"
[  1031.547] (II) XINPUT: Adding extended input device "Microsoft® LifeCam HD-3000" (type: KEYBOARD, id 10)
[  1031.547] (**) Option "xkb_rules" "evdev"
[  1031.547] (**) Option "xkb_model" "pc104"
[  1031.547] (**) Option "xkb_layout" "it"
[  1031.548] (II) config/udev: Adding input device HDA Intel PCH Line (/dev/input/event10)
[  1031.548] (**) HDA Intel PCH Line: Applying InputClass "Keyboard0"
[  1031.548] (II) No input driver specified, ignoring this device.
[  1031.548] (II) This device may have been added with another device file.
[  1031.548] (II) config/udev: Adding input device HDA Intel PCH Line Out Front (/dev/input/event11)
[  1031.548] (**) HDA Intel PCH Line Out Front: Applying InputClass "Keyboard0"
[  1031.548] (II) No input driver specified, ignoring this device.
[  1031.548] (II) This device may have been added with another device file.
[  1031.548] (II) config/udev: Adding input device HDA Intel PCH Line Out Surround (/dev/input/event12)
[  1031.548] (**) HDA Intel PCH Line Out Surround: Applying InputClass "Keyboard0"
[  1031.548] (II) No input driver specified, ignoring this device.
[  1031.548] (II) This device may have been added with another device file.
[  1031.548] (II) config/udev: Adding input device HDA Intel PCH Line Out CLFE (/dev/input/event13)
[  1031.548] (**) HDA Intel PCH Line Out CLFE: Applying InputClass "Keyboard0"
[  1031.548] (II) No input driver specified, ignoring this device.
[  1031.548] (II) This device may have been added with another device file.
[  1031.548] (II) config/udev: Adding input device HDA Intel PCH Front Headphone (/dev/input/event14)
[  1031.548] (**) HDA Intel PCH Front Headphone: Applying InputClass "Keyboard0"
[  1031.548] (II) No input driver specified, ignoring this device.
[  1031.548] (II) This device may have been added with another device file.
[  1031.549] (II) config/udev: Adding input device HDA Intel PCH Front Mic (/dev/input/event8)
[  1031.549] (**) HDA Intel PCH Front Mic: Applying InputClass "Keyboard0"
[  1031.549] (II) No input driver specified, ignoring this device.
[  1031.549] (II) This device may have been added with another device file.
[  1031.549] (II) config/udev: Adding input device HDA Intel PCH Rear Mic (/dev/input/event9)
[  1031.549] (**) HDA Intel PCH Rear Mic: Applying InputClass "Keyboard0"
[  1031.549] (II) No input driver specified, ignoring this device.
[  1031.549] (II) This device may have been added with another device file.
[  1031.549] (II) config/udev: Adding input device Eee PC WMI hotkeys (/dev/input/event3)
[  1031.549] (**) Eee PC WMI hotkeys: Applying InputClass "evdev keyboard catchall"
[  1031.549] (**) Eee PC WMI hotkeys: Applying InputClass "Keyboard0"
[  1031.549] (II) Using input driver 'evdev' for 'Eee PC WMI hotkeys'
[  1031.549] (**) Eee PC WMI hotkeys: always reports core events
[  1031.549] (**) evdev: Eee PC WMI hotkeys: Device: "/dev/input/event3"
[  1031.549] (--) evdev: Eee PC WMI hotkeys: Vendor 0 Product 0
[  1031.549] (--) evdev: Eee PC WMI hotkeys: Found keys
[  1031.549] (II) evdev: Eee PC WMI hotkeys: Configuring as keyboard
[  1031.549] (**) Option "config_info" "udev:/sys/devices/platform/eeepc-wmi/input/input3/event3"
[  1031.549] (II) XINPUT: Adding extended input device "Eee PC WMI hotkeys" (type: KEYBOARD, id 11)
[  1031.549] (**) Option "xkb_rules" "evdev"
[  1031.549] (**) Option "xkb_model" "pc104"
[  1031.549] (**) Option "xkb_layout" "it"
[  1031.549] (II) config/udev: Adding input device AT Translated Set 2 keyboard (/dev/input/event2)
[  1031.549] (**) AT Translated Set 2 keyboard: Applying InputClass "evdev keyboard catchall"
[  1031.549] (**) AT Translated Set 2 keyboard: Applying InputClass "Keyboard0"
[  1031.549] (II) Using input driver 'evdev' for 'AT Translated Set 2 keyboard'
[  1031.549] (**) AT Translated Set 2 keyboard: always reports core events
[  1031.549] (**) evdev: AT Translated Set 2 keyboard: Device: "/dev/input/event2"
[  1031.549] (--) evdev: AT Translated Set 2 keyboard: Vendor 0x1 Product 0x1
[  1031.549] (--) evdev: AT Translated Set 2 keyboard: Found keys
[  1031.549] (II) evdev: AT Translated Set 2 keyboard: Configuring as keyboard
[  1031.550] (**) Option "config_info" "udev:/sys/devices/platform/i8042/serio0/input/input2/event2"
[  1031.550] (II) XINPUT: Adding extended input device "AT Translated Set 2 keyboard" (type: KEYBOARD, id 12)
[  1031.550] (**) Option "xkb_rules" "evdev"
[  1031.550] (**) Option "xkb_model" "pc104"
[  1031.550] (**) Option "xkb_layout" "it"
[  1040.245] (--) NVIDIA(GPU-0): CRT-0: disconnected
[  1040.245] (--) NVIDIA(GPU-0): CRT-0: 400.0 MHz maximum pixel clock
[  1040.245] (--) NVIDIA(GPU-0): 
[  1040.247] (--) NVIDIA(GPU-0): DFP-0: disconnected
[  1040.247] (--) NVIDIA(GPU-0): DFP-0: Internal TMDS
[  1040.247] (--) NVIDIA(GPU-0): DFP-0: 330.0 MHz maximum pixel clock
[  1040.247] (--) NVIDIA(GPU-0): 
[  1040.258] (--) NVIDIA(GPU-0): Philips PHL 274E5 (DFP-1): connected
[  1040.258] (--) NVIDIA(GPU-0): Philips PHL 274E5 (DFP-1): Internal TMDS
[  1040.258] (--) NVIDIA(GPU-0): Philips PHL 274E5 (DFP-1): 340.0 MHz maximum pixel clock
[  1040.258] (--) NVIDIA(GPU-0): 
[  1040.258] (--) NVIDIA(GPU-0): DFP-2: disconnected
[  1040.258] (--) NVIDIA(GPU-0): DFP-2: Internal TMDS
[  1040.258] (--) NVIDIA(GPU-0): DFP-2: 165.0 MHz maximum pixel clock
[  1040.258] (--) NVIDIA(GPU-0): 
[  1040.258] (--) NVIDIA(GPU-0): DFP-3: disconnected
[  1040.258] (--) NVIDIA(GPU-0): DFP-3: Internal TMDS
[  1040.258] (--) NVIDIA(GPU-0): DFP-3: 330.0 MHz maximum pixel clock
[  1040.258] (--) NVIDIA(GPU-0): 
[  1040.258] (--) NVIDIA(GPU-0): DFP-4: disconnected
[  1040.258] (--) NVIDIA(GPU-0): DFP-4: Internal DisplayPort
[  1040.258] (--) NVIDIA(GPU-0): DFP-4: 960.0 MHz maximum pixel clock
[  1040.258] (--) NVIDIA(GPU-0): 
[  1040.915] (--) NVIDIA(GPU-0): CRT-0: disconnected
[  1040.915] (--) NVIDIA(GPU-0): CRT-0: 400.0 MHz maximum pixel clock
[  1040.915] (--) NVIDIA(GPU-0): 
[  1040.918] (--) NVIDIA(GPU-0): DFP-0: disconnected
[  1040.918] (--) NVIDIA(GPU-0): DFP-0: Internal TMDS
[  1040.918] (--) NVIDIA(GPU-0): DFP-0: 330.0 MHz maximum pixel clock
[  1040.918] (--) NVIDIA(GPU-0): 
[  1040.928] (--) NVIDIA(GPU-0): Philips PHL 274E5 (DFP-1): connected
[  1040.929] (--) NVIDIA(GPU-0): Philips PHL 274E5 (DFP-1): Internal TMDS
[  1040.929] (--) NVIDIA(GPU-0): Philips PHL 274E5 (DFP-1): 340.0 MHz maximum pixel clock
[  1040.929] (--) NVIDIA(GPU-0): 
[  1040.929] (--) NVIDIA(GPU-0): DFP-2: disconnected
[  1040.929] (--) NVIDIA(GPU-0): DFP-2: Internal TMDS
[  1040.929] (--) NVIDIA(GPU-0): DFP-2: 165.0 MHz maximum pixel clock
[  1040.929] (--) NVIDIA(GPU-0): 
[  1040.929] (--) NVIDIA(GPU-0): DFP-3: disconnected
[  1040.929] (--) NVIDIA(GPU-0): DFP-3: Internal TMDS
[  1040.929] (--) NVIDIA(GPU-0): DFP-3: 330.0 MHz maximum pixel clock
[  1040.929] (--) NVIDIA(GPU-0): 
[  1040.929] (--) NVIDIA(GPU-0): DFP-4: disconnected
[  1040.929] (--) NVIDIA(GPU-0): DFP-4: Internal DisplayPort
[  1040.929] (--) NVIDIA(GPU-0): DFP-4: 960.0 MHz maximum pixel clock
[  1040.929] (--) NVIDIA(GPU-0): 
[  1064.966] (II) evdev: AT Translated Set 2 keyboard: Close
[  1064.966] (II) UnloadModule: "evdev"
[  1064.966] (II) evdev: Eee PC WMI hotkeys: Close
[  1064.966] (II) UnloadModule: "evdev"
[  1064.966] (II) evdev: Microsoft® LifeCam HD-3000: Close
[  1064.966] (II) UnloadModule: "evdev"
[  1064.966] (II) evdev: A4Tech USB Full Speed: Close
[  1064.966] (II) UnloadModule: "evdev"
[  1064.966] (II) evdev: A4Tech USB Full Speed: Close
[  1064.966] (II) UnloadModule: "evdev"
[  1064.966] (II) evdev: Power Button: Close
[  1064.966] (II) UnloadModule: "evdev"
[  1064.966] (II) evdev: Power Button: Close
[  1064.966] (II) UnloadModule: "evdev"
[  1065.181] (II) NVIDIA(GPU-0): Deleting GPU-0
[  1065.186] (EE) Server terminated successfully (0). Closing log file.
_______________________________________________________________________________

If also those outputs are not sufficient, tell me how is the log file that you want to see

excuse my ignorance ..... :(

Thx.
Comment 8 Christoph Feck 2016-08-04 07:04:56 UTC 
You are getting bug 348194, but I am unsure if it is the cause for the session crash. You might need to check available disk space, or try with a fresh user account.
Comment 9 Sandro 2016-08-04 16:55:55 UTC 
Hi dear; also using a "new fresh" user the trouble is still present.
sandro@ci74771ht ~ $ df -h
File system     Dim. Usati Dispon. Uso% Montato su
udev             10M     0     10M   0% /dev
/dev/sda6        41G   16G     24G  41% /
tmpfs           1,6G  1,2M    1,6G   1% /run
cgroup_root      10M     0     10M   0% /sys/fs/cgroup
shm             7,9G  4,1M    7,9G   1% /dev/shm
/dev/sdb2       246G   66G    168G  29% /home
/dev/sdb1       550G  236G    315G  43% /mnt/Volume

If You want (but for me will be the first time) i can recompile all my Funtoo (e. g. emerge -e world --keep-going)with "debug option activated" and in *FLAGS to add the -gddb USE flag.

Tell me if may be a good idea or not; and i've necessity about a "little" assintance ... cause for me is the first time that i try to introduce "debugging" in my sytem. However i've started the emerge -e world. Excuse my ignorance but i wish to learn .... so can give to you a good feedback.

Thanx for interest :)
Comment 10 Sandro 2016-08-04 17:54:13 UTC 
Sorry but if i use -ggdb *FLAG (with -O0) the system give to me errors; let me try to ask Gentoo or Funtoo forums to know "how to creates a good back-trace". _'_

And excuse me _'_
Comment 11 Sandro 2016-08-09 19:38:51 UTC 
Ok .... now i've made some experiment:

I tried with "Funtoo Stable" with xorg-server-1.17.4 and "nouveau" drivers.
The users exchange now takes place on a regular basis. Then the problem is probably due to the release of xorg-server and / or proprietary nvidia-drivers.

Sorry for this bug report; Now the "users-switch" seems to work properly.

I tried it with "Funtoo Stable" with xorg-server-1.17.4 and "nouveau" drivers.
The users exchange now takes place on a regular basis. Then the problem is probably due to the release of xorg-server and / or proprietary nvidia-drivers.

But I also tried other distributions as Manjaro and devuan; with them there were problems with nouveau.

I hope this feedback can be considered "positive" :)
I will write in "nvidia.com" that there are troubles with graphics proprietary drivers _'_
Thanks for All _'_