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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Screen suddenly goes black, [drm:valleyview_pipestat_irq_handler [i915]] *ERROR* CPU pipe A FIFO underrun"
href="https://bugs.freedesktop.org/show_bug.cgi?id=95367">95367</a>
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<th>Summary</th>
<td>Screen suddenly goes black, [drm:valleyview_pipestat_irq_handler [i915]] *ERROR* CPU pipe A FIFO underrun
</td>
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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>x86-64 (AMD64)
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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>critical
</td>
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<th>Priority</th>
<td>medium
</td>
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<th>Component</th>
<td>DRM/Intel
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<th>Assignee</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
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<th>Reporter</th>
<td>shdownnine@gmail.com
</td>
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<th>QA Contact</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
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<th>CC</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
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<pre>Created <span class=""><a href="attachment.cgi?id=123650" name="attach_123650" title="dmesg after the black screen, when is not preceded by another *ERROR* message">attachment 123650</a> <a href="attachment.cgi?id=123650&action=edit" title="dmesg after the black screen, when is not preceded by another *ERROR* message">[details]</a></span>
dmesg after the black screen, when is not preceded by another *ERROR* message
I have the following issue on my Asus X751MJ laptop, with Linux kernels 4.5.0,
4.5.1 and 4.6-rc6 (does not happen on 4.4.0): at random moments the screen goes
black (that is, the backlight gets turned off) and only goes unblack when I
move a mouse attached to the laptop or touch the touchpad; this is not a usual
pover-saving thing because it usually occurs when I switch between workspaces
(I use i3wm). With 4.5.0 and 4.5.1 kernels a reliable way to reproduce it is to
open two workspaces and run
while true; do i3-msg workspace back_and_forth >/dev/null; done
In a few seconds the screen will go black; with 4.6-rc6 kernel the script does
not reproduce the issue, and it generally occurs rarer, but still does.
The same thing happens if I run
xset dpms force off
(but in this case it also goes unblack if I press a key).
When it goes black at the first time after the boot or a suspend, the following
lines appear in dmesg:
[drm:valleyview_pipestat_irq_handler [i915]] *ERROR* CPU pipe A FIFO underrun
Sometimes it is preceded by the following line:
[drm:intel_set_cpu_fifo_underrun_reporting [i915]] *ERROR* pipe A underrun
The laptop has hybrid graphics, and Intel card plus an NVIDIA one. Initially
nouveau was installed, then I tried installing the proprietary NVIDIA driver,
but that did not help. Now I removed it, configured X11 to use the Intel card
only and even blacklisted the nouveau module, but I didn't help either.</pre>
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