https://bugs.kde.org/show_bug.cgi?id=461824
Bug ID: 461824
Summary: Fullscreen Vulkan issues when game is running on
dedicated GPU on multi GPU setup
Classification: Plasma
Product: kwin
Version: unspecified
Platform: Archlinux
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: compositing
Assignee: kwin-bugs-n...@kde.org
Reporter: minexpla...@gmail.com
Target Milestone: ---
SUMMARY
Several problems when combining 2 gpu's usage in fullscreen mode on external
screens (plasmashell always reports running on integrated GPU (iGPU), while
games / apps run on dedicated GPU (dGPU) for maximum performance).
My laptop have 2 video output ports, one connected to iGPU and second to dGPU.
If external screen is connected to iGPU, then fullscreen Vulkan games running
on dGPU show just black screen with flashes of gameplay when changing volume
(when plasma volume bar shows up).
If external screen is connected to dGPU, then these games work fine, but if
volume bar shows up (or something else from shell on top of the window) game
freezes completely.
Problems occur only for Vulkan apps / games, only for external monitor and only
when in fullscreen mode (using KWin window rules to disable fullscreen, set
manually size to fill the screen and keep the window on top mitigates the
issue).
Tested only on Wayland, because something is bugged and the whole system runs
at 1FPS on X11 (not related issue).
STEPS TO REPRODUCE
1. Connect external monitor to a laptop using iGPU + dGPU
2. Run Vulkan game in fullscreen mode on dGPU
3. Change system volume and let the volume bar disappear
OBSERVED RESULT
Game freezes or black screen
EXPECTED RESULT
Game working fine
SOFTWARE/OS VERSIONS
Linux: EndeavourOS 6.0.5-arch1-g14-1
KDE Plasma Version: 5.26.3
KDE Frameworks Version: 5.99.0
Qt Version: 5.15.7
Graphics Platform: Wayland
ADDITIONAL INFORMATION
My laptop is Asus G14 RK402RJ (iGPU: Ryzen 7 6800HS + dGPU: AMD RX 6700S)
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