https://bugs.kde.org/show_bug.cgi?id=485655
Bug ID: 485655
Summary: [Wayland][AMDGPU] VRAM P-state locked at the highest
state
Classification: Plasma
Product: kwin
Version: 6.0.3
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: wayland-generic
Assignee: kwin-bugs-n...@kde.org
Reporter: nishiyama...@gmail.com
Target Milestone: ---
SUMMARY
KWin on Wayland starts with the VRAM locked at the highest P-state, requiring
to change the resolution or refresh rate to allow the GPU to lower it.
The lock does not happen on X11.
STEPS TO REPRODUCE
1. Start kwin-wayland
2. Run 'cat /sys/class/drm/card0/device/pp_dpm_mclk'
3. VRAM P-state will be set to the highest state and will not allow the GPU to
lower it
4. Change resolution or refresh rate
5. Now the GPU can change the p-state according to load
OBSERVED RESULT
$ cat /sys/class/drm/card0/device/pp_dpm_mclk
0: 96Mhz
1: 456Mhz
2: 675Mhz
3: 1124Mhz *
EXPECTED RESULT
P-state should not be locked at the highest state
SOFTWARE/OS VERSIONS
Linux: Artix Linux (radeonsi, navi22, LLVM 17.0.6, DRM 3.57, Mesa 24.0.5,
6.8.5-273-tkg-eevdf)
KDE Plasma Version: 6.0.3
KDE Frameworks Version: 6.1.0
Qt Version: 6.7.0
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