Bug 355928 - kscreen reports change of primary screen without apparent reason
Summary: kscreen reports change of primary screen without apparent reason
Status: RESOLVED FIXED
Alias: None
Product: KScreen
Classification: Plasma
Component: common (show other bugs)
Version: 5.4.95
Platform: Gentoo Packages Linux
: NOR normal
Target Milestone: ---
Assignee: Sebastian Kügler
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2015-11-26 10:31 UTC by Fabio Coatti
Modified: 2018-06-16 17:12 UTC (History)
28 users (show)

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Latest Commit:
Version Fixed In:

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Description Fabio Coatti 2015-11-26 10:31:31 UTC 
my .xsession-errors is full of messages like this:

nov 26 11:26:55 calvin kded5[2845]: kscreen.kded: Change detected
nov 26 11:26:56 calvin kded5[2845]: kscreen.kded: Saving current config to file
nov 26 11:26:56 calvin kded5[2845]: kscreen.kded: Calculating config ID for KScreen::Config(0x2742230)
nov 26 11:26:56 calvin kded5[2845]: kscreen.kded:         Part of the Id:  "f0cb89c45b53adc93f98e9594806f337"
nov 26 11:26:56 calvin kded5[2845]: kscreen.kded:         Part of the Id:  "b2826f0c9826cc8776a196bf34a1bf7b"
nov 26 11:26:56 calvin kded5[2845]: kscreen.kded:         Config ID: "c569cd1e06d55046907ad24a4fe71777"
nov 26 11:26:56 calvin kded5[2845]: kscreen.kded: Config saved on:  "/home/cova/.local/share/kscreen/c569cd1e06d55046907ad24a4fe71777"
nov 26 11:28:25 calvin kscreen_backend_launcher[2963]: kscreen: Primary output changed from KScreen::Output(Id: 70 , Name: "DP3" ) ( "DP3" ) to KScreen::Output(Id: 70 , Name: "DP3" ) ( "DP3" )
nov 26 11:28:25 calvin kscreen_backend_launcher[2963]: kscreen: Primary output changed from KScreen::Output(Id: 70 , Name: "DP3" ) ( "DP3" ) to KScreen::Output(Id: 70 , Name: "DP3" ) ( "DP3" )
nov 26 11:28:25 calvin kscreen_backend_launcher[2963]: kscreen: Primary output changed from KScreen::Output(Id: 70 , Name: "DP3" ) ( "DP3" ) to KScreen::Output(Id: 70 , Name: "DP3" ) ( "DP3" )
nov 26 11:28:25 calvin kscreen_backend_launcher[2963]: kscreen: Primary output changed from KScreen::Output(Id: 70 , Name: "DP3" ) ( "DP3" ) to KScreen::Output(Id: 70 , Name: "DP3" ) ( "DP3" )
nov 26 11:28:25 calvin kded5[2845]: kscreen: Primary output changed from KScreen::Output(Id: 70 , Name: "DP3" ) ( "DP3" ) to KScreen::Output(Id: 70 , Name: "DP3" ) ( "DP3" )
nov 26 11:28:25 calvin kscreen_backend_launcher[2963]: kscreen: Primary output changed from KScreen::Output(Id: 70 , Name: "DP3" ) ( "DP3" ) to KScreen::Output(Id: 70 , Name: "DP3" ) ( "DP3" )
nov 26 11:28:25 calvin kscreen_backend_launcher[2963]: kscreen: Primary output changed from KScreen::Output(Id: 70 , Name: "DP3" ) ( "DP3" ) to KScreen::Output(Id: 70 , Name: "DP3" ) ( "DP3" )
nov 26 11:28:25 calvin kded5[2845]: kscreen: Primary output changed from KScreen::Output(Id: 70 , Name: "DP3" ) ( "DP3" ) to KScreen::Output(Id: 70 , Name: "DP3" ) ( "DP3" )
nov 26 11:28:25 calvin kscreen_backend_launcher[2963]: kscreen: Primary output changed from KScreen::Output(Id: 70 , Name: "DP3" ) ( "DP3" ) to KScreen::Output(Id: 70 , Name: "DP3" ) ( "DP3" )
nov 26 11:28:25 calvin kscreen_backend_launcher[2963]: kscreen: Primary output changed from KScreen::Output(Id: 70 , Name: "DP3" ) ( "DP3" ) to KScreen::Output(Id: 70 , Name: "DP3" ) ( "DP3" )
nov 26 11:28:25 calvin kded5[2845]: kscreen.kded: Change detected
nov 26 11:28:26 calvin kded5[2845]: kscreen.kded: Saving current config to file
nov 26 11:28:26 calvin kded5[2845]: kscreen.kded: Calculating config ID for KScreen::Config(0x2742230)
nov 26 11:28:26 calvin kded5[2845]: kscreen.kded:         Part of the Id:  "f0cb89c45b53adc93f98e9594806f337"
nov 26 11:28:26 calvin kded5[2845]: kscreen.kded:         Part of the Id:  "b2826f0c9826cc8776a196bf34a1bf7b"
nov 26 11:28:26 calvin kded5[2845]: kscreen.kded:         Config ID: "c569cd1e06d55046907ad24a4fe71777"
nov 26 11:28:26 calvin kded5[2845]: kscreen.kded: Config saved on:  "/home/cova/.local/share/kscreen/c569cd1e06d55046907ad24a4fe71777"

There seems no obviuos reason for this behaviour, as nothing changed on the system.

I have other problems related to kscreen (panels placement, primary screen setup and so on), but I don't know if they are related to this issue.


Reproducible: Always
Comment 1 auxsvr 2015-12-10 13:53:24 UTC 
The message:

kscreen: Primary output changed from KScreen::Output(Id: 571 , Name: "VGA-0" ) ( "VGA-0" ) to  Screen::Output(Id: 571 , Name: "VGA-0" )

appears every 5-10 min in the system log on openSUSE Leap 42.1, plasma 5.5.0, since the update of plasma.
Comment 2 bzi@samadhi-institute.org 2015-12-14 10:27:37 UTC 
It happens very frequently with nvidea 

Dez 12 12:00:19 osiris org.kde.KScreen[9196]: kscreen: Primary output changed from KScreen::Output(Id: 176 , Name: "HDMI-1" ) ( "HDMI-1" ) to KScreen

... and so on
Comment 3 Javier Villavicencio 2015-12-15 11:48:19 UTC 
Gentoo and nvidia proprietary drivers here as well, running 5.5
However logs get sent to systemd so I'm looking at many more messages *per second* and, in particular, this one is noticeable out of the spam:

Dec 15 08:37:05 shaula kded5[1789]: kscreen: Failed to retrieve current config:  "Backend invalidated"

Uncommon piece of my setup is one extra custom xorg ModeLine that bumps 59.95Hz to 60Hz on my monitor, selected by xrandr from /etc/X11/xinit/xinitrc.d scripts.


The common messages are (duplicates removed):
Dec 15 08:37:05 shaula kscreen_backend_launcher[4076]: kscreen: Primary output changed from KScreen::Output(Id: 667 , Name: "DVI-I-3" ) ( "DVI-I-3" ) to KScreen::Output(Id: 667 , Name: "DVI-I-3" ) ( "DVI-I-3" )
Dec 15 08:37:05 shaula kded5[1789]: kscreen: Primary output changed from KScreen::Output(Id: 667 , Name: "DVI-I-3" ) ( "DVI-I-3" ) to KScreen::Output(Id: 667 , Name: "DVI-I-3" ) ( "DVI-I-3" )
Dec 15 08:37:05 shaula kded5[1789]: kscreen.kded: Change detected
Dec 15 08:37:05 shaula kded5[1789]: kscreen.kded: Saving current config to file
Dec 15 08:37:05 shaula kded5[1789]: kscreen.kded: Calculating config ID for KScreen::Config(0x7e5b90)
Dec 15 08:37:05 shaula kded5[1789]: kscreen.kded:       Part of the Id:  "dbfb250a34ac61354a924bc0098b1396"
Dec 15 08:37:05 shaula kded5[1789]: kscreen.kded:       Config ID: "1ddcbf6d3ea69c05e51332b217575713"
Dec 15 08:37:05 shaula kded5[1789]: kscreen.kded: Config saved on:  "/home/paya/.local/share/kscreen/1ddcbf6d3ea69c05e51332b217575713"

The contents of "1ddcbf6d3ea69c05e51332b217575713":
[
    {
        "enabled": true,
        "id": "dbfb250a34ac61354a924bc0098b1396",
        "metadata": {
            "fullname": "xrandr-DELL 2209WA-H736H01A173L",
            "name": "DVI-I-3"
        },
        "mode": {
            "refresh": 59.99993896484375,
            "size": {
                "height": 1050,
                "width": 1680
            }
        },
        "pos": {
            "x": 0,
            "y": 0
        },
        "primary": true,
        "rotation": 1
    }
]
Comment 4 Angelos Skembris 2015-12-16 00:21:49 UTC 
(In reply to auxsvr from comment #1)
> The message:
> 
> kscreen: Primary output changed from KScreen::Output(Id: 571 , Name: "VGA-0"
> ) ( "VGA-0" ) to  Screen::Output(Id: 571 , Name: "VGA-0" )
> 
> appears every 5-10 min in the system log on openSUSE Leap 42.1, plasma
> 5.5.0, since the update of plasma.

I am getting the same behaviour on openSUSE Leap 42.1 and plasma 5.5, on an ATI 4870. Don't know if it related, but I am using a dual monitor setup, one of the monitors is rotated. Both on DVI outputs.

No other serious issues detected, apart from a flicker during log in, which is not present on my laptop, which uses Intel graphics with a dual monitor setup (in that case the external screen is on HDMI).
Comment 5 perrantrevan 2016-01-01 16:54:25 UTC 
I get the same message very frequently on Intel with Arch Linux. Obviously it stops if I uninstall kscreen!
Comment 6 andrew.paulsen 2016-01-04 15:58:39 UTC 
I have the same type of messages in my logs on Arch Linux with the Nvidia proprietary driver.

kscreen: Primary output changed from KScreen::Output(Id: 639 , Name: "DVI-D-0" ) ( "DVI-D-0" ) to KScreen::Output(Id: 639 , Name: "DVI-D-0" ) ( "DVI-D-0" )
Comment 7 Marc Cousin 2016-01-13 08:08:25 UTC 
Same problem too, with an Intel HD3000 video card, xf86-video-intel 1:2.99.917+519+g8229390-1
 on an Archlinux distribution. It seems correlated with the taskbar blinking.
Comment 8 revealed 2016-01-19 19:38:55 UTC 
I can confirm this issue with current OpenSUSE Tumbleweed snapshot 20160116; Extended with Plasma 5.5.3; Kernel 4.4.0-1. Nvidia Beta driver NVIDIA-Linux-x86_64-361.18.run

Greetings,
Comment 9 shining.scias 2016-01-21 02:28:28 UTC 
Same here, NVIDIA dual head, Archlinux, KF 5.18, latest Plasma.

It seems that it triggers everytime I close a window.
Comment 10 tuxfusion 2016-01-22 12:11:56 UTC 
Same here, repeats every 12 seconds exactly

Arch Linux, plasma 5
shortened output from  "journalctl -b -t kdeinit5 -t kscreen_backend_launcher" :

Jan 22 11:00:30 hal8000 kscreen_backend_launcher[921]: kscreen: Primary output changed from KScreen::Output(Id: 639 , Name: "HDMI-0" ) ( "HDMI-0" ) to KScreen::Output(Id: 639 , Name: "HDMI-0" ) ( "HDMI-0" )
Jan 22 11:00:30 hal8000 kscreen_backend_launcher[921]: kscreen: Primary output changed from KScreen::Output(Id: 639 , Name: "HDMI-0" ) ( "HDMI-0" ) to KScreen::Output(Id: 639 , Name: "HDMI-0" ) ( "HDMI-0" )
Jan 22 11:00:30 hal8000 kscreen_backend_launcher[921]: kscreen: Primary output changed from KScreen::Output(Id: 639 , Name: "HDMI-0" ) ( "HDMI-0" ) to KScreen::Output(Id: 639 , Name: "HDMI-0" ) ( "HDMI-0" )
Jan 22 11:00:30 hal8000 kscreen_backend_launcher[921]: kscreen: Primary output changed from KScreen::Output(Id: 639 , Name: "HDMI-0" ) ( "HDMI-0" ) to KScreen::Output(Id: 639 , Name: "HDMI-0" ) ( "HDMI-0" )
Jan 22 11:00:30 hal8000 kdeinit5[892]: kscreen: Primary output changed from KScreen::Output(Id: 639 , Name: "HDMI-0" ) ( "HDMI-0" ) to KScreen::Output(Id: 639 , Name: "HDMI-0" ) ( "HDMI-0" )
Jan 22 11:00:30 hal8000 kscreen_backend_launcher[921]: kscreen: Primary output changed from KScreen::Output(Id: 639 , Name: "HDMI-0" ) ( "HDMI-0" ) to KScreen::Output(Id: 639 , Name: "HDMI-0" ) ( "HDMI-0" )
Jan 22 11:00:30 hal8000 kscreen_backend_launcher[921]: kscreen: Primary output changed from KScreen::Output(Id: 639 , Name: "HDMI-0" ) ( "HDMI-0" ) to KScreen::Output(Id: 639 , Name: "HDMI-0" ) ( "HDMI-0" )
Jan 22 11:00:30 hal8000 kdeinit5[892]: kscreen: Primary output changed from KScreen::Output(Id: 639 , Name: "HDMI-0" ) ( "HDMI-0" ) to KScreen::Output(Id: 639 , Name: "HDMI-0" ) ( "HDMI-0" )
Jan 22 11:00:30 hal8000 kscreen_backend_launcher[921]: kscreen: Primary output changed from KScreen::Output(Id: 639 , Name: "HDMI-0" ) ( "HDMI-0" ) to KScreen::Output(Id: 639 , Name: "HDMI-0" ) ( "HDMI-0" )
Jan 22 11:00:30 hal8000 kscreen_backend_launcher[921]: kscreen: Primary output changed from KScreen::Output(Id: 639 , Name: "HDMI-0" ) ( "HDMI-0" ) to KScreen::Output(Id: 639 , Name: "HDMI-0" ) ( "HDMI-0" )
Jan 22 11:00:30 hal8000 kdeinit5[892]: kscreen.kded: Change detected
Jan 22 11:00:31 hal8000 kdeinit5[892]: kscreen.kded: Saving current config to file
Jan 22 11:00:31 hal8000 kdeinit5[892]: kscreen.kded: Calculating config ID for KScreen::Config(0xd3f210)
Jan 22 11:00:31 hal8000 kdeinit5[892]: kscreen.kded:         Part of the Id:  "382290b851cb5c7fff583389bf3bdc61"
Jan 22 11:00:31 hal8000 kdeinit5[892]: kscreen.kded:         Config ID: "2d0606ab1e3d55cda67323465ed3dec6"
Jan 22 11:00:31 hal8000 kdeinit5[892]: kscreen.kded: Config saved on:  "/home/ken/.local/share/kscreen/2d0606ab1e3d55cda67323465ed3dec6"
Jan 22 11:00:42 hal8000 kscreen_backend_launcher[921]: kscreen: Primary output changed from KScreen::Output(Id: 639 , Name: "HDMI-0" ) ( "HDMI-0" ) to KScreen::Output(Id: 639 , Name: "HDMI-0" ) ( "HDMI-0" )
Jan 22 11:00:42 hal8000 kscreen_backend_launcher[921]: kscreen: Primary output changed from KScreen::Output(Id: 639 , Name: "HDMI-0" ) ( "HDMI-0" ) to KScreen::Output(Id: 639 , Name: "HDMI-0" ) ( "HDMI-0" )
Jan 22 11:00:42 hal8000 kscreen_backend_launcher[921]: kscreen: Primary output changed from KScreen::Output(Id: 639 , Name: "HDMI-0" ) ( "HDMI-0" ) to KScreen::Output(Id: 639 , Name: "HDMI-0" ) ( "HDMI-0" )
Jan 22 11:00:42 hal8000 kscreen_backend_launcher[921]: kscreen: Primary output changed from KScreen::Output(Id: 639 , Name: "HDMI-0" ) ( "HDMI-0" ) to KScreen::Output(Id: 639 , Name: "HDMI-0" ) ( "HDMI-0" )
Jan 22 11:00:42 hal8000 kdeinit5[892]: kscreen: Primary output changed from KScreen::Output(Id: 639 , Name: "HDMI-0" ) ( "HDMI-0" ) to KScreen::Output(Id: 639 , Name: "HDMI-0" ) ( "HDMI-0" )
Jan 22 11:00:42 hal8000 kscreen_backend_launcher[921]: kscreen: Primary output changed from KScreen::Output(Id: 639 , Name: "HDMI-0" ) ( "HDMI-0" ) to KScreen::Output(Id: 639 , Name: "HDMI-0" ) ( "HDMI-0" )
Jan 22 11:00:42 hal8000 kscreen_backend_launcher[921]: kscreen: Primary output changed from KScreen::Output(Id: 639 , Name: "HDMI-0" ) ( "HDMI-0" ) to KScreen::Output(Id: 639 , Name: "HDMI-0" ) ( "HDMI-0" )
Jan 22 11:00:42 hal8000 kdeinit5[892]: kscreen: Primary output changed from KScreen::Output(Id: 639 , Name: "HDMI-0" ) ( "HDMI-0" ) to KScreen::Output(Id: 639 , Name: "HDMI-0" ) ( "HDMI-0" )
Jan 22 11:00:42 hal8000 kscreen_backend_launcher[921]: kscreen: Primary output changed from KScreen::Output(Id: 639 , Name: "HDMI-0" ) ( "HDMI-0" ) to KScreen::Output(Id: 639 , Name: "HDMI-0" ) ( "HDMI-0" )
Jan 22 11:00:42 hal8000 kscreen_backend_launcher[921]: kscreen: Primary output changed from KScreen::Output(Id: 639 , Name: "HDMI-0" ) ( "HDMI-0" ) to KScreen::Output(Id: 639 , Name: "HDMI-0" ) ( "HDMI-0" )
Jan 22 11:00:42 hal8000 kdeinit5[892]: kscreen.kded: Change detected
Jan 22 11:00:43 hal8000 kdeinit5[892]: kscreen.kded: Saving current config to file
Jan 22 11:00:43 hal8000 kdeinit5[892]: kscreen.kded: Calculating config ID for KScreen::Config(0xd3f210)
Jan 22 11:00:43 hal8000 kdeinit5[892]: kscreen.kded:         Part of the Id:  "382290b851cb5c7fff583389bf3bdc61"
Jan 22 11:00:43 hal8000 kdeinit5[892]: kscreen.kded:         Config ID: "2d0606ab1e3d55cda67323465ed3dec6"
Jan 22 11:00:43 hal8000 kdeinit5[892]: kscreen.kded: Config saved on:  "/home/ken/.local/share/kscreen/2d0606ab1e3d55cda67323465ed3dec6"
Jan 22 11:00:54 hal8000 kscreen_backend_launcher[921]: kscreen: Primary output changed from KScreen::Output(Id: 639 , Name: "HDMI-0" ) ( "HDMI-0" ) to KScreen::Output(Id: 639 , Name: "HDMI-0" ) ( "HDMI-0" )
Jan 22 11:00:54 hal8000 kscreen_backend_launcher[921]: kscreen: Primary output changed from KScreen::Output(Id: 639 , Name: "HDMI-0" ) ( "HDMI-0" ) to KScreen::Output(Id: 639 , Name: "HDMI-0" ) ( "HDMI-0" )
Jan 22 11:00:54 hal8000 kscreen_backend_launcher[921]: kscreen: Primary output changed from KScreen::Output(Id: 639 , Name: "HDMI-0" ) ( "HDMI-0" ) to KScreen::Output(Id: 639 , Name: "HDMI-0" ) ( "HDMI-0" )
Jan 22 11:00:54 hal8000 kscreen_backend_launcher[921]: kscreen: Primary output changed from KScreen::Output(Id: 639 , Name: "HDMI-0" ) ( "HDMI-0" ) to KScreen::Output(Id: 639 , Name: "HDMI-0" ) ( "HDMI-0" )
Jan 22 11:00:54 hal8000 kdeinit5[892]: kscreen: Primary output changed from KScreen::Output(Id: 639 , Name: "HDMI-0" ) ( "HDMI-0" ) to KScreen::Output(Id: 639 , Name: "HDMI-0" ) ( "HDMI-0" )
Jan 22 11:00:54 hal8000 kscreen_backend_launcher[921]: kscreen: Primary output changed from KScreen::Output(Id: 639 , Name: "HDMI-0" ) ( "HDMI-0" ) to KScreen::Output(Id: 639 , Name: "HDMI-0" ) ( "HDMI-0" )
Jan 22 11:00:54 hal8000 kscreen_backend_launcher[921]: kscreen: Primary output changed from KScreen::Output(Id: 639 , Name: "HDMI-0" ) ( "HDMI-0" ) to KScreen::Output(Id: 639 , Name: "HDMI-0" ) ( "HDMI-0" )
Jan 22 11:00:54 hal8000 kdeinit5[892]: kscreen: Primary output changed from KScreen::Output(Id: 639 , Name: "HDMI-0" ) ( "HDMI-0" ) to KScreen::Output(Id: 639 , Name: "HDMI-0" ) ( "HDMI-0" )
Jan 22 11:00:54 hal8000 kscreen_backend_launcher[921]: kscreen: Primary output changed from KScreen::Output(Id: 639 , Name: "HDMI-0" ) ( "HDMI-0" ) to KScreen::Output(Id: 639 , Name: "HDMI-0" ) ( "HDMI-0" )
Jan 22 11:00:54 hal8000 kscreen_backend_launcher[921]: kscreen: Primary output changed from KScreen::Output(Id: 639 , Name: "HDMI-0" ) ( "HDMI-0" ) to KScreen::Output(Id: 639 , Name: "HDMI-0" ) ( "HDMI-0" )
Jan 22 11:00:54 hal8000 kdeinit5[892]: kscreen.kded: Change detected
Jan 22 11:00:55 hal8000 kdeinit5[892]: kscreen.kded: Saving current config to file
Jan 22 11:00:55 hal8000 kdeinit5[892]: kscreen.kded: Calculating config ID for KScreen::Config(0xd3f210)
Jan 22 11:00:55 hal8000 kdeinit5[892]: kscreen.kded:         Part of the Id:  "382290b851cb5c7fff583389bf3bdc61"
Jan 22 11:00:55 hal8000 kdeinit5[892]: kscreen.kded:         Config ID: "2d0606ab1e3d55cda67323465ed3dec6"
Jan 22 11:00:55 hal8000 kdeinit5[892]: kscreen.kded: Config saved on:  "/home/ken/.local/share/kscreen/2d0606ab1e3d55cda67323465ed3dec6"
Jan 22 11:01:06 hal8000 kscreen_backend_launcher[921]: kscreen: Primary output changed from KScreen::Output(Id: 639 , Name: "HDMI-0" ) ( "HDMI-0" ) to KScreen::Output(Id: 639 , Name: "HDMI-0" ) ( "HDMI-0" )
Jan 22 11:01:06 hal8000 kscreen_backend_launcher[921]: kscreen: Primary output changed from KScreen::Output(Id: 639 , Name: "HDMI-0" ) ( "HDMI-0" ) to KScreen::Output(Id: 639 , Name: "HDMI-0" ) ( "HDMI-0" )
Jan 22 11:01:06 hal8000 kscreen_backend_launcher[921]: kscreen: Primary output changed from KScreen::Output(Id: 639 , Name: "HDMI-0" ) ( "HDMI-0" ) to KScreen::Output(Id: 639 , Name: "HDMI-0" ) ( "HDMI-0" )


Full log here:  http://pastebin.com/LaVUwcjn
Comment 11 OlafLostViking 2016-01-28 14:30:58 UTC 
Archlinux, Plasma 5.5.4, nvidia driver

kscreen: Primary output changed from KScreen::Output(Id: 653 , Name: "DP-2" ) ( "DP-2" ) to KScreen::Output(Id: 653 , Name: "DP-2" ) ( "DP-2" )
kscreen: Primary output changed from KScreen::Output(Id: 653 , Name: "DP-2" ) ( "DP-2" ) to KScreen::Output(Id: 653 , Name: "DP-2" ) ( "DP-2" )

Appears always in pairs, but without any systematics (at lost none that are easily recognizeable for me).
Comment 12 Maxime Chassagneux 2016-01-29 13:48:28 UTC 
Lot of this kind of line for me too (NVIDIA driver) 

org.kde.KScreen[1506]: kscreen: Primary output changed from KScreen::Output(Id: 638 , Name: "DVI-D-0" ) ( "DVI-D-0" ) to KScreen::Output(Id: 638 , Name: "DVI-D-0" ) ( "DVI-D-0" )

All the time, the same line.
Dual head conf ( 2 HDMI , my screen + one TV )

Some time, I have this line too :

kscreen_backend[1722]: segfault at 10 ip 00007f9ededaba22 sp 00007ffd5cbe2dd0 error 4 in KSC_XRandR.so[7f9eded98000+20000]

And after, all context menu on plasma don't appear. Don't know if it's  concerns about this bug.
Comment 13 Mark Ferguson 2016-01-31 21:39:13 UTC 
I had the same issue when in Kubuntu when I upgraded to Plasma 5.5.3 and KDE’s Frameworks 5.18.0 from Plasma 5.4.3 and KDE Applications 15.08.3. Prior to the upgrade I did not see this log message at all.

org.kde.KScreen[1335]: kscreen: Primary output changed from KScreen::Output(Id: 639 , Name: "DP-2" ) ( "DP-2" ) to KScreen::Output(Id: 639 , Name: "DP-2" ) ( "DP-2" )

I downgraded again to Plasma 5.4.3 (KDE Applications 15.08.3.) because the system logs where starting to fill up with these log messages.

This error message comes form the libkscreen package (src/config.cpp)

The method that prints this message is called void Config::setPrimaryOutput(const OutputPtr &newPrimary)

It is actually classified as a debug message so I am wondering if it is a log level issue or a bug which is causing this method to be called more often than it should?



As mention I do not see this message in the system logs on Plasma 5.4.3 (KDE Applications 15.08.3.). Though I could get the message on the command line when running kscreen-console. I could also stop the message by creating ~/.config/QtProject/qtlogging.ini and adding:

[Rules]
kscreen.debug=false

I am guessing if upgrading again to Plasma 5.5.3 (KDE’s Frameworks 5.18.0) the log messages could be turned of by adding the qtlogging.ini change above to the /etc/xdg/QtProject/ directory.

I haven't been able to test whether this would work and I will probably won't have time this week. I would also be reluctant to do this unless it can be confirmed that the calling of Config::setPrimaryOutput so many times is not a bug?
Comment 14 Sebastian Kügler 2016-02-02 00:09:20 UTC 
I've disabled this (rather useless, to the general public) debug message, fixed in 5.6.
Comment 15 Bruce Wolfe 2016-03-23 05:24:33 UTC 
Disabling the debug message doesn't fix the problem. Can we stay focused on the actual showstopper bug?

org.kde.KScreen[2724]: message repeated 23 times: [ kscreen: Primary output changed from KScreen::Output(Id: 591 , Name: "HDMI-0" ) ( "HDMI-0" ) to KScreen::Output(Id: 591 , Name: "HDMI-0" ) ( "HDMI-0" )]

Kubuntu 15.10 64-bit
KDE Plasma 5.5.4
Qt 5.5.1
Kernel 4.2.0-34-generic
Nvidia GT216 (GeForce GT 220)
Comment 16 Sebastian Kügler 2016-04-04 22:55:21 UTC 
Sure. I've two theories:

(1) Qt gets the primary display change heuristics wrong
(2) Someone calls into xrandr 

In either case, an event trigger is triggered which writes out an errorneous config.

(1) should be fixed in Qt 5.6.0, could you test against this Qt version?
Comment 17 Sebastian Kügler 2016-04-04 22:57:03 UTC 
Ow, and please also try with Plasma 5.6, if that's possible. There have been some fixes in kscreen's xrandr backend.
Comment 18 Fabio Coatti 2016-04-07 07:51:15 UTC 
I no longer see those messages in .xsession-errors (plasma 5.6.2 and Qt 5.5.1)
Comment 19 lithi 2016-08-26 02:27:04 UTC 
I confirm this bug is on Kubuntu 16.04.  Here's what I see in the syslog:

Aug 25 14:26:35 bodhi org.kde.KScreen[5166]: kscreen: Primary output changed from KScreen::Output(Id: 65 , Name: "LVDS-1" ) ( "LVDS-1" ) to KScreen::Output(Id: 65 , Name: "LVDS-1" ) ( "LVDS-1" )
Aug 25 14:26:35 bodhi org.kde.KScreen[5166]: message repeated 15 times: [ kscreen: Primary output changed from KScreen::Output(Id: 65 , Name: "LVDS-1" ) ( "LVDS-1" ) to KScreen::Output(Id: 65 , Name: "LVDS-1" ) ( "LVDS-1" )]
Aug 25 14:28:14 bodhi org.kde.KScreen[5166]: kscreen: Primary output changed from KScreen::Output(Id: 65 , Name: "LVDS-1" ) ( "LVDS-1" ) to KScreen::Output(Id: 65 , Name: "LVDS-1" ) ( "LVDS-1" )
Aug 25 14:28:14 bodhi org.kde.KScreen[5166]: message repeated 15 times: [ kscreen: Primary output changed from KScreen::Output(Id: 65 , Name: "LVDS-1" ) ( "LVDS-1" ) to KScreen::Output(Id: 65 , Name: "LVDS-1" ) ( "LVDS-1" )]

My solution for the time being was to uninstall kscreen
Comment 20 dogshed 2016-08-26 13:50:32 UTC 
Me too.
It's a Dell XPS laptop (from 2012). I sometimes plug it into the TV so I don't want to lose that ability, but when it blanks the screen while sitting on my desk not hooked to anything I have no choice but to reboot.
Comment 21 Daniel T. 2016-11-17 19:59:52 UTC 
Still affects kscreen 4:5.5.5-0ubuntu1
Comment 22 Christoph Feck 2016-11-18 02:26:50 UTC 
Kubuntu 16.04 has Plasma/Qt 5.5.x.

Please add a comment if this is still an issue with Plasma 5.7.5 and Qt 5.6.2.
Comment 23 lithi 2016-11-18 02:55:59 UTC 
Have not had any issues with kscreen 4:5.7.5-0ubuntu1 and plasma 4:5.7.5-0ubuntu1