| Bug ID | 99967 |
|---|---|
| Summary | RX 480 sclk clock speed lowers when under load |
| Product | DRI |
| Version | unspecified |
| Hardware | Other |
| OS | All |
| Status | NEW |
| Severity | normal |
| Priority | medium |
| Component | DRM/AMDgpu |
| Assignee | dri-devel@lists.freedesktop.org |
| Reporter | haagch@frickel.club |
Created attachment 129917 [details]
screenshot with echo manual > power_dpm_force_performance_level
My GPU is the factory overclocked XFX Radeon RX 480 XXX OC, this might have
something to do with it.
I noticed this on agd5d/drm-next-4.12-wip and found similar behavior on 4.10,
4.9 and 4.8.
It's even affected even with echo manual >
/sys/class/drm/card0/device/power_dpm_force_performance_level
I've made a screenshot of radeon-profile on linux 4.8.14 and annotated it.
Steps I took:
echo manual > /sys/class/drm/card0/device/power_dpm_force_performance_level
echo 7 > /sys/class/drm/card0/device/pp_dpm_sclk
then started unigine-heaven, closed it, waited a couple of seconds, started
furmark, closed it, waited a couple of seconds and then ran another echo 7 >
/sys/class/drm/card0/device/pp_dpm_sclk
When the GPU is "relatively" idle (just displaying the desktop with a browser,
etc.) this doesn't happen. I can echo any number in
/sys/class/drm/card0/device/pp_dpm_sclk and it sticks.
But when I start applications that put some stress on the GPU, the sclk clock
lowers - and stays on a lower level even when the load is gone, until another
number is echo'ed into /sys/class/drm/card0/device/pp_dpm_sclk
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