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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [IVB] boot error: *ERROR* uncleared pch fifo underrun on pch transcoder A"
href="https://bugs.freedesktop.org/show_bug.cgi?id=89806">89806</a>
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<th>Summary</th>
<td>[IVB] boot error: *ERROR* uncleared pch fifo underrun on pch transcoder A
</td>
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<th>Product</th>
<td>DRI
</td>
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<th>Version</th>
<td>DRI git
</td>
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<th>Hardware</th>
<td>x86-64 (AMD64)
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<th>OS</th>
<td>Linux (All)
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<th>Status</th>
<td>NEW
</td>
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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
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<th>Assignee</th>
<td>intel-gfx-bugs@lists.freedesktop.org
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<th>Reporter</th>
<td>chris.bainbridge@gmail.com
</td>
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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
</td>
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<pre>Created <span class=""><a href="attachment.cgi?id=114692" name="attach_114692" title="dmesg-intel-drm-14.txt">attachment 114692</a> <a href="attachment.cgi?id=114692&action=edit" title="dmesg-intel-drm-14.txt">[details]</a></span>
dmesg-intel-drm-14.txt
Hardware is Macbook Pro 2012 13" with three monitors.
Kernel is drm-nightly 07e5c9b5 and 4.0.0-rc5+ 7fc377e
On every boot there is the error:
Mar 29 02:25:17 debian kernel: [drm:intel_set_pch_fifo_underrun_reporting]
*ERROR* uncleared pch fifo underrun on pch transcoder A
Mar 29 02:25:17 debian kernel: [drm:intel_dump_pipe_config] ips: 0
Mar 29 02:25:17 debian kernel: [drm:intel_pch_fifo_underrun_irq_handler]
*ERROR* PCH transcoder A FIFO underrun
Apart from that, everything seems to work ok. This might have been around for a
while - the Debian Jessie 3.16.0 kernel also complains:
Mar 29 00:18:19 debian kernel: [drm:cpt_set_fifo_underrun_reporting] *ERROR*
uncleared pch fifo underrun on pch transcoder A
Mar 29 00:18:19 debian kernel: [drm:cpt_serr_int_handler] *ERROR* PCH
transcoder A FIFO underrun
dmesg with drm.debug=14 attached</pre>
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