[Bug 99275] Kernel 4.9: amdgpu regression; gui flickers; amd radeon rx 460

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=99275

--- Comment #33 from Reimar Imhof <tuxuser at quantentunnel.de> ---
(In reply to Michel Dänzer from comment #27)
> (In reply to Reimar Imhof from comment #26)
> > Together with comment #24 there is a render bug in kernel 4.8 that shows up
> > at 100% cpu load.
> > With kernel 4.9 this same bug shows up at 0% / idle cpu load.
> > 
> > With 
> > af79ad2b1f337a00aa150b993635b10bc68dc842
> > Merge branch 'sched-core-for-linus' of
> > git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
> > it changed from "bug shows at 100% load" to "bug shows at 0% load". And the
> > change is something about the scheduler.
> > To me this seems likely.
> 
> Not really. That commit is a pure merge commit, which makes it unlikely that
> it behaves any differently from either of its parent commits. So git bisect
> should have identified one of its ancestor commits instead. The fact that it
> identified a pure merge commit indicates that the result is incorrect, most
> likely because at least one commit along the way was incorrectly classified
> as good (or bad).

I forgot to mention:
I had a look at the first merge commits. I did _not_ do a "git bisect" but for
example a "git reset --hard 7af8a0f8088831428051976cb06cc1e450f8bab5" followed
by a "make rpm" to compile "Merge tag 'arm64-upstream' of
git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux".
"e606d81d2d9596ab2b4fd0dc052eea0485b7e8c2
Merge branch 'ras-core-for-linus' of
git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip" was a good commit - no
problems at idle cpu as described in Comment #23.
That one was followed by "af79ad2b1f337a00aa150b993635b10bc68dc842
Merge branch 'sched-core-for-linus' of
git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip" which turned out to be
the first bad commit (glitches at 0 cpu load).
So all tested commits were pure merge commits.

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