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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - 【braswell】"*ERROR* cpu pipe A|B|C fifo underrun" - can not recovery"
href="https://bugs.freedesktop.org/show_bug.cgi?id=103844">103844</a>
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<th>Summary</th>
<td>【braswell】"*ERROR* cpu pipe A|B|C fifo underrun" - can not recovery
</td>
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<th>Product</th>
<td>DRI
</td>
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<th>Version</th>
<td>unspecified
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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>critical
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<th>Priority</th>
<td>medium
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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>wkcl00022@163.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>our device which use [braswell] n3160 to decode&display report "pipe underrun"
accidentally, however, can not be recovery. we have two display modes for the
device. one is three hdmi display mode, another is hdmi&vga with same source
display mode. the relationship between pipe and connecter is pipeA - DP0
pipeB-HDMI_A3 pipeC-HDMI_A1. when this bug happens, the output of hdmi(or
vga) refer to related pipe is not correct. the condition to reproducting the
bug as follows:
1)kernel version: linux-4.2.x
2)drm version:libdrm-2.4.64
3)application: the layout of hdmi(or vga) output changed periodically for
10s，and each layout has several "windows" which maybe overlapped for display
decoded picture.so we also have decoder business on braswell.
4)now this bug is always happens after about 2 days when we run our business</pre>
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