[Bug 109135] R9 390 hangs at boot with DPM/DC enabled for kernels 4.19.x and above, says KMS not supported

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Comment # 22 on bug 109135 from
(In reply to Alex Deucher from comment #21)
> (In reply to iive from comment #20)
> > Anyway, bisect was done successfully.
> > 
> > I just still kind of don't understand why it landed on that commit.
> > It doesn't look like this is the commit that changes the default amdgpu.dpm
> > method.
> 
> The default change may have happened before that change and that change may
> have broken the old dpm code since presumably dpm=1 was set while bisecting.

You haven't look at the commit.

It is code refactoring. It doesn't remove, add or modify any functionality. It
just changes how some functions are called. (1 function pointer and
switch/case, instead of 3 function pointers.)
I honestly could not spot what might be wrong with it.


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