[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 # 12 on bug 109135 from
(In reply to iive from comment #10)
> (In reply to Alex Deucher from comment #9)
> > (In reply to rmuncrief from comment #8)
> > > (In reply to Alex Deucher from comment #7)
> > > > Can you bisect to figure out what commit broke things for you?
> > > 
> > > Actually I remember doing that many years ago when I was a maintainer for
> > > Steam under wine. I'll look and see if I can find a current bisect tutorial
> > > and give it a try. Any links or tips you can give to help give me a quick
> > > start would be appreciated. I do remember it can take many days, which I'm
> > > willing to invest as I said. However the fewer days the better! :)
> > 
> > It's pretty straight forward.  Just google for "kernel git bisect howto".
> 
> Bisecting between two major stable kernel versions is a nightmare.(Aka
> 4.18.0 - 4.19.0)
> 
> Most of the new changes are done before RC1 and it is quite common that
> there are major breakages there, in systems we do not want to bother with.
> These breakages are usually fixed (or reverted) in later Release Candidates.

This is not always the case; in most cases bisects are pretty smooth.  If you
run into unrelated problems with a particular commit, you can always skip it
during the bisect (git bisect skip).


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