https://bugs.kde.org/show_bug.cgi?id=506523
Bug ID: 506523
Summary: KWin on Wayland in KDE 6.4.1 ignores iGPU preference,
defaults to dGPU, causes login loop if overridden, and
keeps AMD GPU always powered
Classification: Plasma
Product: kwin
Version First 6.4.1
Reported In:
Platform: Fedora RPMs
OS: Linux
Status: REPORTED
Severity: major
Priority: NOR
Component: platform-drm
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Target Milestone: ---
Created attachment 182888
--> https://bugs.kde.org/attachment.cgi?id=182888&action=edit
Full bug report
After upgrading to KDE Plasma 6.4.1 on Fedora 42 (Wayland session),
kwin_wayland forcibly uses the discrete AMD GPU (Radeon R5 M445) instead of the
default integrated Intel GPU, as reported by switcherooctl. This results in
constant dGPU usage, excessive battery drain, and system heat. Attempts to
override this behavior with KWIN_DRM_DEVICES result in an SDDM login loop.
Additionally, using DRI_PRIME=1 fails with Mesa errors.
This regression did not occur in KDE 6.3. The system is currently unbootable
due to these issues, and a snapshot rollback was required.
Please see the attached md for full details, logs, hardware specs, and
reproduction steps.
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