Bug 386035

Summary:	SDDM Loginscreen is black
Product:	[Plasma] plasmashell	Reporter:	Unknown <null>
Component:	general	Assignee:	David Edmundson <kde>
Status:	RESOLVED FIXED
Severity:	normal	CC:	nate, plasma-bugs-null, rion4ik
Priority:	NOR
Version First Reported In:	5.11.1
Target Milestone:	1.0
Platform:	Arch Linux
OS:	Linux
Latest Commit:		Version Fixed/Implemented In:	5.21
Sentry Crash Report:

Description Unknown 2017-10-21 18:36:16 UTC

Hello

Notebook with Optimus (Intel and Nvidia)
1. Operation with Intel, login screen is visible.
2. Operation with Nvidia, login screen is black.
It is however possible to log on blindly if the cursor is in the password field.
Error occurs with sddm.
Drivers are
Intel = xf86-video-intel 1: 2.99.917 + 796 + g04b4f3b7-1
Nvidia = nvidia 387.12-2
OS = ArchLinux

Config under Nvidia
Section "OutputClass"
    Identifier "intel"
    MatchDriver "i915"
    Driver "modesetting"
EndSection

Section "OutputClass"
    Identifier "nvidia"
    MatchDriver "nvidia-drm"
    Driver "nvidia"
    "AllowEmptyInitialConfiguration"
    Option "PrimaryGPU" "yes"
    ModulePath "/ usr / lib / nvidia / xorg"
EndSection

Xsetup contains:
xrandr --setprovideroutputsource modesetting NVIDIA-0

xrandr --listproviders returns:
Providers: number: 2
Provider 0: id: 0x2d6 cap: 0x1, Source Output crtcs: 0 outputs: 0 associatedProviders: 1 name: NVIDIA-0
Provider 1: id: 0x46 cap: 0xf, Source Output, Sink Output, Source Offload, Sink Offload crtcs: 3 outputs: 4 associated providers: 1 name: modesetting

Is it a bug in sddm?

greeting
Google Translate.

Comment 1 Sergey 2020-06-16 09:51:18 UTC

This looks similar to what I experience
Also an laptop with Intel and nvidia.
sddm shows black screen but I still can type my password and login. After I logged in everything works fine.

If I connect additional monitor, then usually I see the login prompt just on it while laptop display is black.

I guess sddm uses X configuration and probably there is something wrong it, while after login some xrandr magic fixes displays configuration.
In any case, showing the black screen is hardly a good option something is wrong with X config unless something is really terribly wrong.

KDE 5.18.5, Gentoo Linux.

$ cat /etc/X11/xorg.conf
# nvidia-xconfig: X configuration file generated by nvidia-xconfig
# nvidia-xconfig:  version 440.82

# nvidia-settings: X configuration file generated by nvidia-settings
# nvidia-settings:  version 440.82

Section "ServerLayout"
    Identifier     "Layout0"
    Screen      0  "Screen0" 0 0
    Inactive       "InactiveDevice1"
    Inactive       "InactiveDevice1"
    InputDevice    "Keyboard0" "CoreKeyboard"
    InputDevice    "Mouse0" "CorePointer"
    Option         "Xinerama" "0"
EndSection

Section "Files"
EndSection

Section "InputDevice"

    # generated from data in "/etc/conf.d/gpm"
    Identifier     "Mouse0"
    Driver         "mouse"
    Option         "Protocol"
    Option         "Device" "/dev/input/mice"
    Option         "Emulate3Buttons" "no"
    Option         "ZAxisMapping" "4 5"
EndSection

Section "InputDevice"

    # generated from default
    Identifier     "Keyboard0"
    Driver         "kbd"
EndSection

#Section "Monitor"
#    Identifier     "Monitor0"
#    VendorName     "Unknown"
#    ModelName      "LG Electronics LG ULTRAWIDE"
#    HorizSync       30.0 - 90.0
#    VertRefresh     56.0 - 75.0
#    Option         "DPMS"
#EndSection

Section "Device"
    Identifier     "Device0"
    Driver         "nvidia"
    VendorName     "NVIDIA Corporation"
    BoardName      "GeForce GTX 1660 Ti"
    BusID          "PCI:1:0:0"
EndSection

Section "Device"
    Identifier     "InactiveDevice1"
    Driver         "modesetting"
    VendorName     "Unknown"
EndSection

Section "Device"
    Identifier     "InactiveDevice1"
    Driver         "modesetting"
    VendorName     "Unknown"
EndSection

Section "Screen"
    Identifier     "Screen0"
    Device         "Device0"
    #Monitor        "Monitor0"
    DefaultDepth    24
    Option         "Stereo" "0"
    Option         "nvidiaXineramaInfoOrder" "DFP-0"
    Option         "metamodes" "nvidia-auto-select +1920+0"
    Option         "SLI" "Off"
    Option         "MultiGPU" "Off"
    Option         "BaseMosaic" "off"
    Option         "AllowEmptyInitialConfiguration" "True"
    SubSection     "Display"
        Depth       24
    EndSubSection
EndSection


$ xrandr --listproviders
Providers: number : 2
Provider 0: id: 0x1b8 cap: 0x1, Source Output crtcs: 4 outputs: 3 associated providers: 1 name:NVIDIA-0
Provider 1: id: 0x1e3 cap: 0xf, Source Output, Sink Output, Source Offload, Sink Offload crtcs: 3 outputs: 1 associated providers: 1 name:modesetting

Comment 2 Nate Graham 2021-03-11 19:20:50 UTC

This was fixed in Plasma 5.21.