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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [KBL] [drm:intel_cpu_fifo_underrun_irq_handler] *ERROR* CPU pipe A FIFO underrun"
href="https://bugs.freedesktop.org/show_bug.cgi?id=99344">99344</a>
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<th>Summary</th>
<td>[KBL] [drm:intel_cpu_fifo_underrun_irq_handler] *ERROR* CPU pipe A FIFO underrun
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<th>Product</th>
<td>DRI
</td>
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<th>Version</th>
<td>unspecified
</td>
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<th>Hardware</th>
<td>Other
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<th>OS</th>
<td>All
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<th>Status</th>
<td>NEW
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>medium
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<th>Component</th>
<td>DRM/Intel
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<th>Assignee</th>
<td>intel-gfx-bugs@lists.freedesktop.org
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<th>Reporter</th>
<td>ryabinin.a.a@gmail.com
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<th>QA Contact</th>
<td>intel-gfx-bugs@lists.freedesktop.org
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<th>CC</th>
<td>intel-gfx-bugs@lists.freedesktop.org
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<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=128853" name="attach_128853" title="dmesg">attachment 128853</a> <a href="attachment.cgi?id=128853&action=edit" title="dmesg">[details]</a></span>
dmesg
This occasionally happens on resume, after display has been suspended.
I.e. I can trigger this via following commands:
xset dpms force suspend && xset dpms force on
Sometimes screen remains black after that.
There are two errors in dmesg:
[ 850.328129] [drm:skl_set_cdclk] *ERROR* failed to inform PCU about cdclk
change
[ 850.533486] [drm:intel_cpu_fifo_underrun_irq_handler] *ERROR* CPU pipe A
FIFO underrun
Sometimes I see only the first error, but in that case display works, it
doesn't remain black. So this might be a two separate issues, I'm going to open
another bug for the first error.
dmesg with drm.debug=1e attached.
Kernel version - 4.9.2
Hardware - Dell XPS 13 9360</pre>
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