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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [IVB]igt/kms_flip/wf_vblank-interruptible sporadically causes *ERROR* uncleared pch fifo underrun on pch transcoder A"
href="https://bugs.freedesktop.org/show_bug.cgi?id=85898">85898</a>
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<th>Summary</th>
<td>[IVB]igt/kms_flip/wf_vblank-interruptible sporadically causes *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>unspecified
</td>
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<th>Hardware</th>
<td>All
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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>normal
</td>
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<th>Priority</th>
<td>medium
</td>
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<th>Component</th>
<td>DRM/Intel
</td>
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<th>Assignee</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
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<th>Reporter</th>
<td>huax.lu@intel.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
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<pre>Created <span class=""><a href="attachment.cgi?id=108932" name="attach_108932" title="dmesg">attachment 108932</a> <a href="attachment.cgi?id=108932&action=edit" title="dmesg">[details]</a></span>
dmesg
==System Environment==
--------------------------
Regression: not sure
Non-working platforms: IVB
==kernel==
--------------------------
drm-intel-nightly/f56717bdf29eb7d6a9ec15f095ea2a6858895473
==Bug detailed description==
It sporadically causes "*ERROR* uncleared pch fifo underrun on pch transcoder
A", fail rate: 3/5
output:
IGT-Version: 1.8-ge622850 (x86_64) (Linux:
3.18.0-rc3_drm-intel-nightly_f56717_20141105+ x86_64)
Using monotonic timestamps
Beginning wf_vblank-interruptible on crtc 8, connector 18
1024x768 60 1024 1048 1184 1344 768 771 777 806 0xa 0x40 65000
............................................................
wf_vblank-interruptible on crtc 8, connector 18: PASSED
Beginning wf_vblank-interruptible on crtc 12, connector 18
1024x768 60 1024 1048 1184 1344 768 771 777 806 0xa 0x40 65000
............................................................
wf_vblank-interruptible on crtc 12, connector 18: PASSED
Beginning wf_vblank-interruptible on crtc 16, connector 18
1024x768 60 1024 1048 1184 1344 768 771 777 806 0xa 0x40 65000
............................................................
wf_vblank-interruptible on crtc 16, connector 18: PASSED
Subtest wf_vblank-interruptible: SUCCESS (30.349s)
==Reproduce steps==
----------------------------
1. ./kms_flip --run-subtest wf_vblank-interruptible</pre>
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