https://bugs.kde.org/show_bug.cgi?id=494749
Bug ID: 494749
Summary: Heuristic for selecting primary GPU
Classification: Plasma
Product: kwin
Version: unspecified
Platform: Other
OS: Other
Status: REPORTED
Severity: normal
Priority: NOR
Component: platform-drm
Assignee: kwin-bugs-n...@kde.org
Reporter: supe...@gmail.com
Target Milestone: ---
SUMMARY
On some laptops Kwin can pick the wrong GPU as the primary. This is most
notable if the PCI device ordering of the dGPU comes before the integrated GPU
in the APU.
OBSERVED RESULT
Wrong GPU picked on some ASUS Strix laptops
EXPECTED RESULT
Right GPU picked on some ASUS Strix laptops
ADDITIONAL INFORMATION
A heuristic proposal was submitted to GNOME/mutter to look at the connectors
[1]. I think Kwin can do the same thing.
I think it would be a good idea to add a heuristic that walks all the DRM
connectors. The compositor should look specifically for eDP connectors. If
any eDP connectors have an enabled display then mark the DRM device associated
with them as the primary GPU.
If multiple eDP connectors or no eDP connectors have an enabled display then
don't do anything differently.
There is a tangential issue that the kernel picks the wrong boot VGA device
[2].
[1] https://gitlab.gnome.org/GNOME/mutter/-/issues/3746
[2]
https://lore.kernel.org/linux-pci/4c33a9ad-fbdb-42ca-aff7-e50420c13...@kernel.org/T/#m205ed43a258cdc892eeb1a2365603c86d51c40b0
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