[Bug 202043] amdgpu: Vega 56 SCLK drops to 700 Mhz when undervolting

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=202043

--- Comment #5 from Ivan Avdeev (lists at w23.ru) ---
Created attachment 281917
  --> https://bugzilla.kernel.org/attachment.cgi?id=281917&action=edit
Example of undervolting effect

Example of what happens when undervolting is attempted. Notice how:
- frame time goes from stable ~15ms to stuttering 25-30ms
- core freq drops from ~1.4GHz to 1.1GHz
- memory freq goes from stable ~900MHz to rapidly oscillating between
200-900MHz.

Captured by running Unigine Superposition in game mode on medium setttings on
2560x1440 screen with
`GALLIUM_HUD=.d.w1920frametime,.d.w1920shader-clock+memory-clock
GALLIUM_HUD_PERIOD=0`

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