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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 - [IVB] at boot all displays cycled on/off over and over *ERROR* CPU pipe B FIFO underrun"
href="https://bugs.freedesktop.org/show_bug.cgi?id=90307">90307</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>[IVB] at boot all displays cycled on/off over and over *ERROR* CPU pipe B FIFO underrun
</td>
</tr>
<tr>
<th>Product</th>
<td>DRI
</td>
</tr>
<tr>
<th>Version</th>
<td>DRI git
</td>
</tr>
<tr>
<th>Hardware</th>
<td>x86-64 (AMD64)
</td>
</tr>
<tr>
<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>chris.bainbridge@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>Using linux git 6c3c1eb (May 1st)
Macbook with 3 monitors
Booting is normally fine, but on one boot no displays came on, instead every
display, including the internal laptop display, seemed to be cycling on and off
rapidly. Odd.
[ 7.309929] [drm:intel_set_cpu_fifo_underrun_reporting] *ERROR* uncleared
fifo underrun on pipe B
[ 7.309935] [drm:intel_cpu_fifo_underrun_irq_handler] *ERROR* CPU pipe B
FIFO underrun
[ 7.309950] [drm:intel_set_pch_fifo_underrun_reporting] *ERROR* uncleared
pch fifo underrun on pch transcoder B
[ 7.309953] [drm:intel_pch_fifo_underrun_irq_handler] *ERROR* PCH transcoder
B FIFO underrun
[ 8.357580] ax88179_178a 1-3.3.4.1:1.0 eth0: ax88179 - Link status is: 1
[ 8.386869] random: nonblocking pool is initialized
[ 9.575978] [drm:intel_set_pch_fifo_underrun_reporting] *ERROR* uncleared
pch fifo underrun on pch transcoder C
[ 9.733064] [drm:intel_set_cpu_fifo_underrun_reporting] *ERROR* uncleared
fifo underrun on pipe B
[ 9.733070] [drm:intel_cpu_fifo_underrun_irq_handler] *ERROR* CPU pipe B
FIFO underrun
[ 9.733079] [drm:intel_set_pch_fifo_underrun_reporting] *ERROR* uncleared
pch fifo underrun on pch transcoder B
[ 9.733082] [drm:intel_pch_fifo_underrun_irq_handler] *ERROR* PCH transcoder
B FIFO underrun
[ 12.166051] [drm:intel_set_pch_fifo_underrun_reporting] *ERROR* uncleared
pch fifo underrun on pch transcoder C
[ 12.303010] [drm:intel_set_cpu_fifo_underrun_reporting] *ERROR* uncleared
fifo underrun on pipe B
[ 12.303017] [drm:intel_cpu_fifo_underrun_irq_handler] *ERROR* CPU pipe B
FIFO underrun
[ 12.303025] [drm:intel_set_pch_fifo_underrun_reporting] *ERROR* uncleared
pch fifo underrun on pch transcoder B
[ 12.303027] [drm:intel_pch_fifo_underrun_irq_handler] *ERROR* PCH transcoder
B FIFO underrun
[ 14.771931] [drm:intel_set_pch_fifo_underrun_reporting] *ERROR* uncleared
pch fifo underrun on pch transcoder C
[ 14.908020] [drm:intel_set_cpu_fifo_underrun_reporting] *ERROR* uncleared
fifo underrun on pipe B
[ 14.908027] [drm:intel_cpu_fifo_underrun_irq_handler] *ERROR* CPU pipe B
FIFO underrun
[ 14.908037] [drm:intel_set_pch_fifo_underrun_reporting] *ERROR* uncleared
pch fifo underrun on pch transcoder B
[ 14.908039] [drm:intel_pch_fifo_underrun_irq_handler] *ERROR* PCH transcoder
B FIFO underrun
[ 17.361970] [drm:intel_set_pch_fifo_underrun_reporting] *ERROR* uncleared
pch fifo underrun on pch transcoder C
[ 17.502117] [drm:intel_set_cpu_fifo_underrun_reporting] *ERROR* uncleared
fifo underrun on pipe B
[ 17.502124] [drm:intel_cpu_fifo_underrun_irq_handler] *ERROR* CPU pipe B
FIFO underrun
[ 17.502133] [drm:intel_set_pch_fifo_underrun_reporting] *ERROR* uncleared
pch fifo underrun on pch transcoder B
[ 17.502134] [drm:intel_pch_fifo_underrun_irq_handler] *ERROR* PCH transcoder
B FIFO underrun
[ 19.968054] [drm:intel_set_pch_fifo_underrun_reporting] *ERROR* uncleared
pch fifo underrun on pch transcoder C
[ 20.102951] [drm:intel_set_cpu_fifo_underrun_reporting] *ERROR* uncleared
fifo underrun on pipe B
[ 20.102957] [drm:intel_cpu_fifo_underrun_irq_handler] *ERROR* CPU pipe B
FIFO underrun
[ 20.102966] [drm:intel_set_pch_fifo_underrun_reporting] *ERROR* uncleared
pch fifo underrun on pch transcoder B
[ 20.102968] [drm:intel_pch_fifo_underrun_irq_handler] *ERROR* PCH transcoder
B FIFO underrun
[ 22.558021] [drm:intel_set_pch_fifo_underrun_reporting] *ERROR* uncleared
pch fifo underrun on pch transcoder C
[ 22.692150] [drm:intel_set_cpu_fifo_underrun_reporting] *ERROR* uncleared
fifo underrun on pipe B
[ 22.692157] [drm:intel_cpu_fifo_underrun_irq_handler] *ERROR* CPU pipe B
FIFO underrun
[ 22.692166] [drm:intel_set_pch_fifo_underrun_reporting] *ERROR* uncleared
pch fifo underrun on pch transcoder B
[ 22.692167] [drm:intel_pch_fifo_underrun_irq_handler] *ERROR* PCH transcoder
B FIFO underrun
[ 25.164746] [drm:intel_set_pch_fifo_underrun_reporting] *ERROR* uncleared
pch fifo underrun on pch transcoder C
[ 25.300187] [drm:intel_set_cpu_fifo_underrun_reporting] *ERROR* uncleared
fifo underrun on pipe B
[ 25.300194] [drm:intel_cpu_fifo_underrun_irq_handler] *ERROR* CPU pipe B
FIFO underrun
[ 25.300203] [drm:intel_set_pch_fifo_underrun_reporting] *ERROR* uncleared
pch fifo underrun on pch transcoder B
[ 25.300205] [drm:intel_pch_fifo_underrun_irq_handler] *ERROR* PCH transcoder
B FIFO underrun
[ 27.773187] [drm:intel_set_pch_fifo_underrun_reporting] *ERROR* uncleared
pch fifo underrun on pch transcoder C
[ 27.910214] [drm:intel_set_cpu_fifo_underrun_reporting] *ERROR* uncleared
fifo underrun on pipe B
[ 27.910220] [drm:intel_cpu_fifo_underrun_irq_handler] *ERROR* CPU pipe B
FIFO underrun
[ 27.910227] [drm:intel_set_pch_fifo_underrun_reporting] *ERROR* uncleared
pch fifo underrun on pch transcoder B
[ 27.910229] [drm:intel_pch_fifo_underrun_irq_handler] *ERROR* PCH transcoder
B FIFO underrun
[ 30.362202] [drm:intel_set_pch_fifo_underrun_reporting] *ERROR* uncleared
pch fifo underrun on pch transcoder C
[ 30.504276] [drm:intel_set_cpu_fifo_underrun_reporting] *ERROR* uncleared
fifo underrun on pipe B
[ 30.504295] [drm:intel_cpu_fifo_underrun_irq_handler] *ERROR* CPU pipe B
FIFO underrun
[ 30.504304] [drm:intel_set_pch_fifo_underrun_reporting] *ERROR* uncleared
pch fifo underrun on pch transcoder B
[ 30.504306] [drm:intel_pch_fifo_underrun_irq_handler] *ERROR* PCH transcoder
B FIFO underrun
[ 32.970648] [drm:intel_set_pch_fifo_underrun_reporting] *ERROR* uncleared
pch fifo underrun on pch transcoder C
[ 33.105024] [drm:intel_set_cpu_fifo_underrun_reporting] *ERROR* uncleared
fifo underrun on pipe B
[ 33.105030] [drm:intel_cpu_fifo_underrun_irq_handler] *ERROR* CPU pipe B
FIFO underrun
[ 33.105039] [drm:intel_set_pch_fifo_underrun_reporting] *ERROR* uncleared
pch fifo underrun on pch transcoder B
[ 33.105041] [drm:intel_pch_fifo_underrun_irq_handler] *ERROR* PCH transcoder
B FIFO underrun
[ 35.577461] [drm:intel_set_pch_fifo_underrun_reporting] *ERROR* uncleared
pch fifo underrun on pch transcoder C
[ 35.718331] [drm:intel_set_cpu_fifo_underrun_reporting] *ERROR* uncleared
fifo underrun on pipe B
[ 35.718337] [drm:intel_cpu_fifo_underrun_irq_handler] *ERROR* CPU pipe B
FIFO underrun
[ 35.718345] [drm:intel_set_pch_fifo_underrun_reporting] *ERROR* uncleared
pch fifo underrun on pch transcoder B
[ 35.718347] [drm:intel_pch_fifo_underrun_irq_handler] *ERROR* PCH transcoder
B FIFO underrun
[ 38.151096] [drm:intel_set_pch_fifo_underrun_reporting] *ERROR* uncleared
pch fifo underrun on pch transcoder C
[ 38.286267] [drm:intel_set_cpu_fifo_underrun_reporting] *ERROR* uncleared
fifo underrun on pipe B
[ 38.286273] [drm:intel_cpu_fifo_underrun_irq_handler] *ERROR* CPU pipe B
FIFO underrun
[ 38.286382] [drm:intel_set_pch_fifo_underrun_reporting] *ERROR* uncleared
pch fifo underrun on pch transcoder B
[ 38.286386] [drm:intel_pch_fifo_underrun_irq_handler] *ERROR* PCH transcoder
B FIFO underrun
[ 40.775336] [drm:intel_set_pch_fifo_underrun_reporting] *ERROR* uncleared
pch fifo underrun on pch transcoder C
[ 40.912389] [drm:intel_set_cpu_fifo_underrun_reporting] *ERROR* uncleared
fifo underrun on pipe B
[ 40.912396] [drm:intel_cpu_fifo_underrun_irq_handler] *ERROR* CPU pipe B
FIFO underrun
[ 40.912407] [drm:intel_set_pch_fifo_underrun_reporting] *ERROR* uncleared
pch fifo underrun on pch transcoder B
The rest of dmesg just shows those errors repeating until I turned off the
laptop 5 minutes later.</pre>
</div>
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