[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

Ivan Avdeev (lists at w23.ru) changed:

           What    |Removed                     |Added
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                 CC|                            |lists at w23.ru

--- Comment #4 from Ivan Avdeev (lists at w23.ru) ---
I have the very same issue on Vega 64. Changing any voltage value from stock
even by 1mV leads to severe throttling.

E.g.:
```
echo "manual" > $DEV/power_dpm_force_performance_level
echo "2" > $DEV/pp_sclk_od
echo "2" > $DEV/pp_mclk_od
echo "s 7 1663 1190" > $DEV/pp_od_clk_voltage # stock = 1200
echo "c" > $DEV/pp_od_clk_voltage
```

Will result in 0.5x performance and stutter.

This doesn't happen on windows on the same hardware.

Card: MSI Radeon RX Vega 64 Air Boost 8G OC
Kernels tried: 4.20, 5.0-rc2, 5.0.2
Mesa: 18.3.3, 18.3.4
MB: ASUS Prime X399-A, bios 0808
CPU: Threadripper 1950X

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