[Bug 107889] colors are wrong on one screen with Radeon RX Vega M GL and Kernel 4.18

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=107889

--- Comment #9 from Mauro Carvalho Chehab <mchehab at infradead.org> ---
(In reply to Michel Dänzer from comment #8)
> (In reply to Mauro Carvalho Chehab from comment #6)
> > Bisect didn't work. There is a regression between 4.17 and 4.18-rc4 on
> > ext4fs that causes it fail to mount a file system:
> 
> There are ways to deal with that, e.g.:
> 
> * Manually apply the fix for the ext4 regression when necessary
> * Run "git bisect skip" for commits which aren't testable
> * Manually find another commit which can be tested

I tried to bisect, but I was unable to find the patch with broke it. I suspect
it could be some sort of race condition, perhaps when retrieving EDID from the
3 monitors. Which buggy Kernels, the collor has a chance to be mangled during
X11 start and after DPMS screen on. Sometimes, it goes fine, sometimes, it gets
messed.

Anyway, since yesterday I'm using Kernel 4.20, with the latest linux-firmware.
It seems that the issue vanished, but I need to keep it running for a while to
be certain.

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