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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - WQHD Displayport only 27 Hz"
href="https://bugs.freedesktop.org/show_bug.cgi?id=93343">93343</a>
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<th>Summary</th>
<td>WQHD Displayport only 27 Hz
</td>
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<th>Product</th>
<td>xorg
</td>
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<th>Version</th>
<td>unspecified
</td>
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<th>Hardware</th>
<td>x86-64 (AMD64)
</td>
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<th>OS</th>
<td>Linux (All)
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>medium
</td>
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<th>Component</th>
<td>Driver/Radeon
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<th>Assignee</th>
<td>xorg-driver-ati@lists.x.org
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<th>Reporter</th>
<td>mastergizmo@arcor.de
</td>
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<th>QA Contact</th>
<td>xorg-team@lists.x.org
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<p>
<div>
<pre>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</pre>
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