https://bugs.kde.org/show_bug.cgi?id=466705
Bug ID: 466705
Summary: X11, AMD+Nvidia: The external screen connected via usb
type c port (display port 1.4 alt mode protocol) is
black after sleep-wakeup cycle
Classification: Plasma
Product: KScreen
Version: 5.27.2
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: common
Assignee: kscreen-bugs-n...@kde.org
Reporter: chermnykh2...@gmail.com
Target Milestone: ---
I have similar problem with hybrid amd+nvidia setup, but only after wake from
sleep (reboot works fine)
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: First noticed on 5.26.5, still reproduces on 5.27.2
KDE Frameworks Version: 5.103.0
Qt Version: 5.15.8
NVIDIA drivers: 525.89.02
Linux kernel: 6.2.1-zen1-1-zen
OTHER INFO:
See also https://bugs.kde.org/show_bug.cgi?id=460341#c118
After fixing the mentioned issue the problem still occurs for me
This problem only appears when using type-c <-> dp cable. Does not reproduce
with HDMI cable
Both ports are internally connected to the NVIDIA GPU. The internal screen is
connected to the integrated GPU
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