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<base href="https://bugs.freedesktop.org/" />
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<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Priority</th>
<td>high
</td>
</tr>
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - [ILK/SNB/IVB/HSW Regression]igt/testdisplay causes *ERROR* Pipe A FIFO underrun"
href="https://bugs.freedesktop.org/show_bug.cgi?id=74102">74102</a>
</td>
</tr>
<tr>
<th>CC</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
<tr>
<th>Assignee</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
<tr>
<th>Summary</th>
<td>[ILK/SNB/IVB/HSW Regression]igt/testdisplay causes *ERROR* Pipe A FIFO underrun
</td>
</tr>
<tr>
<th>QA Contact</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
<tr>
<th>Severity</th>
<td>major
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr>
<tr>
<th>OS</th>
<td>Linux (All)
</td>
</tr>
<tr>
<th>Reporter</th>
<td>huax.lu@intel.com
</td>
</tr>
<tr>
<th>Hardware</th>
<td>All
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Version</th>
<td>unspecified
</td>
</tr>
<tr>
<th>Component</th>
<td>DRM/Intel
</td>
</tr>
<tr>
<th>Product</th>
<td>DRI
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=92830" name="attach_92830" title="dmesg">attachment 92830</a> <a href="attachment.cgi?id=92830&action=edit" title="dmesg">[details]</a></span>
dmesg
System Environment:
--------------------------
Platform: Ironlake
Kernel(drm-intel-nightly)f27f16540be56813df2ebb8e1106dd5c258f07c3
Bug detailed description:
-------------------------
igt/testdisplay causes <3>[ 152.786238] [drm:ilk_display_irq_handler] *ERROR*
Pipe A FIFO underrun.
It happens on Ironlake, Sandybridge,Ivybridge, and Haswell with -queued and
-nightly kernel. It doesn't happen on -fixes kernel.
The latest known good commit: 74655033599ea5757a5305abf2577eea586cd295
The latest known bad commit: fc2c807b7a2b2ca8dbe2aed2f5ae730c19beeda5
output:
CRTC(3):[0] 1280x1024 60 1280 1328 1440 1688 1024 1025 1028 1066 0x5 0x48
108000
CRTC(3):[1] 1280x1024 75 1280 1296 1440 1688 1024 1025 1028 1066 0x5 0x40
135000
CRTC(3):[2] 1152x864 75 1152 1216 1344 1600 864 865 868 900 0x5 0x40 108000
CRTC(3):[3] 1024x768 75 1024 1040 1136 1312 768 769 772 800 0x5 0x40 78800
CRTC(3):[4] 1024x768 60 1024 1048 1184 1344 768 771 777 806 0xa 0x40 65000
CRTC(3):[5] 800x600 75 800 816 896 1056 600 601 604 625 0x5 0x40 49500
CRTC(3):[6] 800x600 60 800 840 968 1056 600 601 605 628 0x5 0x40 40000
CRTC(3):[7] 640x480 75 640 656 720 840 480 481 484 500 0xa 0x40 31500
CRTC(3):[8] 640x480 60 640 656 752 800 480 490 492 525 0xa 0x40 25200
CRTC(3):[9] 720x400 70 720 738 846 900 400 412 414 449 0x6 0x40 28320
Reproduce steps:
-------------------------
1. ./testdisplay</pre>
</div>
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