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<base href="https://bugs.freedesktop.org/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - DisplayPort Cant's set 60hz refresh rate"
href="https://bugs.freedesktop.org/show_bug.cgi?id=89998">89998</a>
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<th>Summary</th>
<td>DisplayPort Cant's set 60hz refresh rate
</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)
</td>
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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/intel
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<th>Assignee</th>
<td>chris@chris-wilson.co.uk
</td>
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<th>Reporter</th>
<td>hawara@gmail.com
</td>
</tr>
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<th>QA Contact</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr></table>
<p>
<div>
<pre>I have a Philips Brilliance 288P monitor, which should support 3840x2160 @ 60Hz
through DisplayPort.
My computer is a Lenovo ThinkPad T550 with Intel HD Graphics 5500, which also
should support this resolution and refresh rate.
However, only 30Hz mode works - If I switch the display to 60hz (or when it
tries this setting automatically during login)
I just see weird grey lines on half of the screen, other half is black
(Screenshot -
<a href="https://www.dropbox.com/s/1toa4v4clxg71jf/2015-04-13%2012.04.04.jpg?dl=0">https://www.dropbox.com/s/1toa4v4clxg71jf/2015-04-13%2012.04.04.jpg?dl=0</a> )
xrandr reports both refresh rates:
DP1 connected 3840x2160+2880+0 (normal left inverted right x axis y axis) 621mm
x 341mm
3840x2160 60.00 + 30.00*
I'm running kernel 4.0.0-rc7-drm_intel_nightly_20150411 (on 3.19 or mainline
4.0-rc7 kernel the system locks up on entering this refresh rate) with
parameter i915.enable_ips=0
Monitor DisplayPort mode is set to 1.2.</pre>
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