https://bugs.kde.org/show_bug.cgi?id=460341
Dmitrii Chermnykh <chermnykh2...@gmail.com> changed:
What |Removed |Added
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CC| |chermnykh2...@gmail.com
--- Comment #118 from Dmitrii Chermnykh <chermnykh2...@gmail.com> ---
I have similar problem with hybrid amd+nvidia setup, but only after wake from
sleep (reboot works fine)
The problem first appeared on 5.26 branch, still persists on 5.27 beta with new
kscreen backend
STEPS TO REPRODUCE
1. Use amd+nvidia hybrid setup (using ryzen 5800 + nvidia 3050 ti)
X11 displays configuration:
```
Section "Files"
ModulePath "/usr/lib/nvidia"
ModulePath "/usr/lib32/nvidia"
ModulePath "/usr/lib32/nvidia/xorg/modules"
ModulePath "/usr/lib32/xorg/modules"
ModulePath "/usr/lib64/nvidia/xorg/modules"
ModulePath "/usr/lib64/nvidia/xorg"
ModulePath "/usr/lib64/xorg/modules"
EndSection
Section "ServerLayout"
Identifier "layout"
Screen 0 "integrated"
Inactive "nvidia"
Option "AllowNVIDIAGPUScreens"
EndSection
Section "Device"
Identifier "integrated"
Driver "modesetting"
BusID "PCI:6:0:0"
Option "TearFree" "true"
Option "DRI" "3"
Option "VariableRefresh" "on"
Option "AsyncFlipSecondaries" "on"
EndSection
Section "Screen"
Identifier "integrated"
Device "integrated"
Option "AllowExternalGpus"
EndSection
Section "Device"
Identifier "nvidia"
Driver "nvidia"
BusID "PCI:1:0:0"
Option "RegistryDwords" "EnableBrightnessControl=1"
Option "AsyncFlipSecondaries" "on"
EndSection
Section "Screen"
Identifier "nvidia"
Device "nvidia"
EndSection
```
2. Connect external screen via type c cable with display port alt mode protocol
3. Put laptop into sleep mode
4. Wake the laptop up from sleep
5. Only internal screen is available, the external one sees no signal
6. Switch to tty2 and back (ctrl+alt+f2 -> ctrl+alt+f1)
7. Kernel refreshed the available screens and the external screen is available
once again
OBSERVED RESULT
External display loses signal after sleep-wakeup cycle
EXPECTED RESULT
External display reconnects automatically
POSSIBLE WORKAROUNDS:
Ask kernel/x11 to rescan displays when quirky hardware is detected
SOFTWARE/OS VERSIONS
Linux/KDE Plasma:
(available in About System)
archlinux packages
KDE Plasma Version: 5.26.5
KDE Frameworks Version: 5.102.0
Qt Version: 5.15.8+kde+r174-1
NVIDIA drivers: 525.85.05-1
Linux kernel: 6.1.7-zen1-1-zen
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