WQHD Displayport only 27 Hz
Submitted by Michael Stenzel
Assigned to xf86-video-ati maintainers
Description
Hello,
since the new amd "crimson" driver removed support for older cards
and I read that the opensource "radeon" driver is now in a pretty usable
state, I decided to try it out a few days ago.
I run slackware64-current, and used the included xorg 1.18.0
and mesa 11.0.6. I compiled a fresh kernel from kernel.org - 4.4-rc4
Everything went pretty well, until I noticed that my WQHD Display
( 2560 x 1440 ) connected via Displayport was stuck at 27 Hz instead
the usual 60 Hz.
( I also have a second screen 1920 x 1980 connected via DVI which was
working correctly at 60Hz )
I tried a few things with xrandr to force it to 60 Hz, but nothing helped.
Also xrandr -q displayed it is using 60 Hz, but Monitor Info displayed 27 Hz.
Not sure if this is a bug, or 60 Hz via displayport at higher resolutions
requires some proprietary magic which is only present in fglrx driver?
Anyway I am back on fglrx driver now and have 60 Hz again, so I can't provide
any follow up data. But I thought it would still be a good idea to report it
in case this is a bug.
Kind regards,
Michael Stenzel