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<base href="https://bugs.freedesktop.org/">
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<body><table border="1" cellspacing="0" cellpadding="8">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - CPU pipe A FIFO underrun"
href="https://bugs.freedesktop.org/show_bug.cgi?id=100219">100219</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>CPU pipe A FIFO underrun
</td>
</tr>
<tr>
<th>Product</th>
<td>DRI
</td>
</tr>
<tr>
<th>Version</th>
<td>unspecified
</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>udo@hypervisor.org
</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>Created <span class=""><a href="attachment.cgi?id=130233" name="attach_130233" title="dmesg">attachment 130233</a> <a href="attachment.cgi?id=130233&action=edit" title="dmesg">[details]</a></span>
dmesg
The following CPU pipe A underrun can be observed during booting Linux-4.10.X
on an Intel SNB processor. It is 100% reproducible during every boot and it
occurs before any other software runs.
[ 1.071498] [drm] Initialized
[ 1.071698] [drm] Disabling PPGTT because VT-d is on
[ 1.071714] [drm] Memory usable by graphics device = 2048M
[ 1.071717] [drm] VT-d active for gfx access
[ 1.071721] [drm] Replacing VGA console driver
[ 1.071736] [drm] DMAR active, disabling use of stolen memory
[ 1.078093] [drm] Supports vblank timestamp caching Rev 2 (21.10.2013).
[ 1.078099] [drm] Driver supports precise vblank timestamp query.
[ 1.151068] [drm] Initialized i915 1.6.0 20161121 for 0000:00:02.0 on minor
0
[ 1.365751] fbcon: inteldrmfb (fb0) is primary device
[ 2.224399] [drm:intel_cpu_fifo_underrun_irq_handler] *ERROR* CPU pipe A
FIFO underrun
[ 2.227469] [drm:intel_set_pch_fifo_underrun_reporting] *ERROR* uncleared
pch fifo underrun on pch transcoder A
[ 2.227478] [drm:cpt_irq_handler] *ERROR* PCH transcoder A FIFO underrun
[ 2.414759] i915 0000:00:02.0: fb0: inteldrmfb frame buffer device
Full dmesg attached.</pre>
</div>
</p>
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