[Bug 93826] 2560x1440 @144Hz graphic glitches and bad refresh rate

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=93826

--- Comment #31 from Yves W. <yves.weber at yahoo.de> ---
(In reply to Michel Dänzer from comment #29)
> (In reply to Yves W. from comment #27)
> > - with default driver and default kernel (Linux Mint 18 -> 4.4.0-38-generi)
> > it's working at 2560x1440 @144hz, no flickering issues.
> > 
> > -> tried using the Ubuntu 4.8.0 kernel -> flickering at 2560x1440 @144hz,120
> > and 100hz. only 60hz works without flickering
> 
> Can you bisect, or at least narrow down which version between 4.4.0 and
> 4.8.0 introduced the problem?

as I said, I only tried current linux mint Kernel which is 4.4.0-38-generic
right now. With that one AND the default radeon driver module for amd card R9
290 4GB, I have no problems at all. I can do 2560x1440 resolution @ 144hz.
Second I upgradedm, as I posted, to the ubuntu kernel 4.8.0 from ubuntu ppa,
which gives errors (strong flickering in 2d mode, 3d works at some point but
also gives few flickering problems) WITH 2560x1440 resolution, for all hz above
60hz (which means flickering at 100,120 and 144)

Furthermore the amd beta driver amdgpu-pro gives in every kernel I tried (4.4
and 4.8) flickering problems with refreshrates above 60hz.
 -> but here note: I switched ( with kernel 4.4.0-38-generic + amdgpu-pro
16.30.3-315407) to 1080p resolution and 144,120 and 100hz gave NO errors at
all, which means no flickering! Dunno why. maybe an 1440p issue.

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