[Bug 106363] Powerplay support for SI asics

[bugzilla-daemon@freedesktop.org]

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https://bugs.freedesktop.org/show_bug.cgi?id=106363

--- Comment #4 from Gregor Münch <gr.muench@gmail.com> ---
(In reply to Alex Deucher from comment #3)
> dpm is enabled by default on SI parts so setting dpm=1 doesn't change
> anything.

This depends if you use amdgpu instead of radeon on SI. In that case amdgpu.dpm
seems to be disabled.
I tried to enable DPMS and read through a bunch of tutorials configuring Xorg
but nothing did work.
Then I stumbled about a newsentry on phoronix mentioned this patch:
https://lists.freedesktop.org/archives/amd-gfx/2018-May/022771.html
There you change the behavior for CIK parts to use PP by default. The logic of
this patch changes amdgpu.dpm=-1 (auto) to switch from whatever to Powerplay.


I started my Kernel with amdgpu.dpm=1 and everything suddenly worked like
magic.

Since I dont what Powerplay actually does in the Linux world and a quick google
search came up with nothing and modinfo amdgpu just reveils
dpm:DPM support (1 = enable, 0 = disable, -1 = auto) (int)
but nothing about Powerplay I was really under the impression that DPM also
enables Powerplay.
Im sorry for the confusion.

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