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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A FIFO underrun"
href="https://bugs.freedesktop.org/show_bug.cgi?id=98503">98503</a>
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<tr>
<th>Summary</th>
<td>[drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A FIFO underrun
</td>
</tr>
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<th>Product</th>
<td>DRI
</td>
</tr>
<tr>
<th>Version</th>
<td>unspecified
</td>
</tr>
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<th>Hardware</th>
<td>x86-64 (AMD64)
</td>
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<th>OS</th>
<td>Linux (All)
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
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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>DRM/Intel
</td>
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<th>Assignee</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>gentoo@gishpuppy.com
</td>
</tr>
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<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=127625" name="attach_127625" title="dmesg with drm.debug=0x1e">attachment 127625</a> <a href="attachment.cgi?id=127625&action=edit" title="dmesg with drm.debug=0x1e">[details]</a></span>
dmesg with drm.debug=0x1e
System architecture: x86_64
Kernel version: 4.9.0-rc2+ (drm-intel-nightly, latest checkout (commit
bbb625b))
Linux distribution: Gentoo Linux
Machine: Acer TravelMate B116-M-P16S
Processor: Intel Pentium N3700
Display connector: HDMI
I have connected an external monitor to my laptop using HDMI, internal LCD is
disabled. I am using the default settings that the screen is disabled after
some time of inactivity. Sometimes, when I press a key or move the mouse to
turn back on the screen, I only see a white screen (sometimes a different
color, but mostly white). Starting programs using a keyboard shortcut does not
help to get back the desktop.
My workaround is to call a script using a keyboard shortcut that turns off HDMI
output (xrandr --output HDMI1 --off) and enables the internal LCD (xrandr
--output eDP1 --auto --primary). After that I call a different script that
turns off the internal LCD and switches back to HDMI output. Sometimes I have
to call the scripts multiple times until I can resume work.
If the problem happens the kernel log shows:
[drm:intel_set_cpu_fifo_underrun_reporting [i915]] *ERROR* pipe A underrun
[drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A FIFO
underrun
I have attached the dmesg output with drm.debug=0x1e.</pre>
</div>
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