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<base href="https://bugs.freedesktop.org/" />
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<body><table border="1" cellspacing="0" cellpadding="8">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [HSW DP] Can't get 4k@60Hz (pipe underruns)"
href="https://bugs.freedesktop.org/show_bug.cgi?id=90909">90909</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>[HSW DP] Can't get 4k@60Hz (pipe underruns)
</td>
</tr>
<tr>
<th>Product</th>
<td>DRI
</td>
</tr>
<tr>
<th>Version</th>
<td>XOrg git
</td>
</tr>
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<th>Hardware</th>
<td>x86-64 (AMD64)
</td>
</tr>
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<th>OS</th>
<td>Linux (All)
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>medium
</td>
</tr>
<tr>
<th>Component</th>
<td>DRM/Intel
</td>
</tr>
<tr>
<th>Assignee</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>tmadeira@gmail.com
</td>
</tr>
<tr>
<th>QA Contact</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
<tr>
<th>CC</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=116382" name="attach_116382" title="dmesg output when I run 'xrandr --output DP1 --mode 3840x2160'">attachment 116382</a> <a href="attachment.cgi?id=116382&action=edit" title="dmesg output when I run 'xrandr --output DP1 --mode 3840x2160'">[details]</a></span>
dmesg output when I run 'xrandr --output DP1 --mode 3840x2160'
I have a Lenovo ThinkPad X240 with a Intel Graphics HD 4400 [Haswell-ULT GPU
8086:0a16] and I'm running Arch Linux x86_64 with kernel
4.1.0-rc6-drm_intel_nightly_20150607. I've recently got a Dell P2415Q monitor
and I can't get 3840x2160@60Hz via Mini DisplayPort to work (right now I'm
running 3840x2160@35Hz). When I run "xrandr --output DP1 --mode 3840x2160", I
get a "drm:intel_set_cpu_fifo_underrun_reporting" (complete dmesg output
attached).
Kernel options: video.use_native_backlight=0 i915.enable_ips=0
This looks similtar to <a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED FIXED - [BDW DP] 4k@60Hz pipe underruns -> corruption & hangs"
href="show_bug.cgi?id=90043">https://bugs.freedesktop.org/show_bug.cgi?id=90043</a>
(except that I have a HSW instead of BDW) but the latest drm-intel-nightly did
not fix it for me.
Any clue on what's going on or plans to fix it? Any other info I can provide to
help?
Thanks,
Tiago</pre>
</div>
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