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

[bugzilla-daemon at freedesktop.org]

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

--- Comment #14 from Damien <dherault at hotmail.com> ---
Grub uses the old VGA driver and can not handle the 290x @144hz. It's the same
issue with the opensource which works correctly only @60 Hz...  I fixed the
problem by forcing a resolution with grub. 

But impossible to solve the issue with the xf86-video-ati driver. Also tried
the git version.

Remember, no issue with windows & linux with Catalyst fglrx driver so I do not
trust a hardware issue.
There must be a différence in refresh rate management if catalyst wedge to
144Hz immediately after installation while the opensource driver made a bizarre
139Hz with artifacts (see attachments).

Can be an important point to clarify: I use DisplayPort 1.2.

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