https://bugs.kde.org/show_bug.cgi?id=497764
Bug ID: 497764
Summary: Some games on hybrid AMD GPU setup stop rendering when
played on external monitor
Classification: Plasma
Product: kwin
Version: 6.2.4
Platform: Fedora RPMs
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: platform-drm
Assignee: kwin-bugs-n...@kde.org
Reporter: geo...@hypertextcoffee.com
Target Milestone: ---
Created attachment 176809
--> https://bugs.kde.org/attachment.cgi?id=176809&action=edit
video showing problem with playing games on external display
SUMMARY
I'm observing a behaviour with playing some games on Fedora Kinoite wherein
some games will just stop rendering entirely until you press the Super key to
open the Application Launcher. When doing this, the game will render normally
until you click into the window again. The game is still playing sound and
seemingly responding to user input in this state. This doesn't happen in
windowed mode however, and not with every day. This only happens when I have an
external display connected to my laptop via HDMI, which is connected directly
to the dGPU.
iGPU is an AMD Radeon 680M, and dGPU is an AMD Radeon RX 6800S.
A "fix" I have been using is to add
"KWIN_DRM_DEVICES="/dev/dri/card1:/dev/dri/card2"" to /etc/environment, which
forces the dGPU to take priority but results in terrible battery life when in
hybrid mode, due to everything then running on the dGPU by default. The other
workaround is to connect my external display via the left side USB-C port,
which is connected to the iGPU.
I found one other person with the same model of laptop as me on the Majaro
forum, with exactly the same issue (but using Manjaro instead)
https://forum.manjaro.org/t/games-dont-render-on-external-monitor/172060
It doesn't seem to happen in all games, but the 2 I've noticed are both Unreal
Engine 5 (Marvel Rivals, and Palworld). Could be because they're both DX12
titles. For good measure, I also tried a DX9 game (The Elder Scrolls IV:
Oblivion) and didn't observe the behaviour, and also an OpenGL game
(Minecraft), also did not observe the behaviour.
Just for clarification, this doesn't happen with any games when using the
internal laptop screen, as it is connected to the iGPu by default. I have not
tried setting the GPU MUX to connect the display directly to the dGPU, but I
presume the result would be the same.
STEPS TO REPRODUCE
1. Connect display to laptop with port connected directly to dGPU.
2. Launch Marvel Rivals
3. Once you get into the menu, start a practice match. As soon as the mouse
cursor is hidden (due to gameplay), the game will stop rendering.
OBSERVED RESULT
Game appears to freeze
EXPECTED RESULT
Game should play normally
SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Fedora Kinoite 41
KDE Plasma Version: 6.2.4
KDE Frameworks Version: 6.9.0
Qt Version: 6.8.1
Wayland
ADDITIONAL INFORMATION
I've attached a video to show the issue.
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