https://bugs.freedesktop.org/show_bug.cgi?id=106428
Bug ID: 106428
Summary: reported VDDGFX GPU voltage jumps above set limits in
pp_od_clk_voltage when UVD is used for VAAPI/VDPAU
Product: DRI
Version: unspecified
Hardware: x86-64 (AMD64)
OS: Linux (All)
Status: NEW
Severity: normal
Priority: medium
Component: DRM/AMDgpu
Assignee: dri-devel@lists.freedesktop.org
Reporter: tempel.jul...@gmail.com
I adjusted my pstates in "/sys/class/drm/card0/device/pp_od_clk_voltage" that
the GPU voltage should never be above 900 mV:
(...)
5: 1126Mhz 880 mV
6: 1180Mhz 890 mV
7: 1209Mhz 900 mV
And in normal 3D applications "watch -n 0.5 cat
/sys/kernel/debug/dri/0/amdgpu_pm_info" accordingly never reports more than 900
mV for VDDGFX.
But when I play a video in mpv with VAAPI/VDPAU, reported VDDGFX often jumps to
1100 mV, which clearly is undesired behavior. It sticks again to normal 900 mV
as soon as I disable hardware decoding.
Now the question is, if the reported voltage is correct (then adjusting
pp_od_clk_voltage has a bug) or if the real voltage is just reported wrong
(than information in amdgpu_pm_info would be wrong).
Happens with both 4.17rc2 and drm-next-4.18-wip.
GPU is RX 560.
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