[Bug 210683] Nasty amdgpu powersave regression Navi14

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=210683

David Mak (david.18.19.21 at gmail.com) changed:

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--- Comment #4 from David Mak (david.18.19.21 at gmail.com) ---
Created attachment 294239
  --> https://bugzilla.kernel.org/attachment.cgi?id=294239&action=edit
dmesg outputs for 5.9.14 and 5.10.1.

I can reproduce the issue on the RX 6800 (Navi 21 XL).

I use Radeontop to inspect the memory/GPU clock of my GPU.

When using Linux 5.9.14:
- In both KDE Plasma and tty2, Memory Clock hovers at around 100MHz.
- GPU Power reported by lm_sensors is around 5-7W.

When using Linux 5.10.1:
- In tty2, Memory Clock hovers at around 100MHz and GPU Power reported by
lm_sensors is around 5-7W.
- In KDE Plasma, Memory Clock is usually around 1GHz (100%), although it can be
down to ~470MHz, and GPU Power reported by lm_sensors is around 30W.
- Disconnecting one of my two monitors does not change the memory clock.

I am trying to bisect the commit, but many revisions seem to give a blank
screen or the amdgpu module is not loaded. (I suspect I am not building the
kernel properly)

Tested linux-firmware versions: 20201120.bc9cd0b, 20201218.646f159

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