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<base href="https://bugs.freedesktop.org/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [BSW partly bisected] testdisplay shows abnormal"
href="https://bugs.freedesktop.org/show_bug.cgi?id=88620">88620</a>
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<th>Summary</th>
<td>[BSW partly bisected] testdisplay shows abnormal
</td>
</tr>
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<th>Product</th>
<td>DRI
</td>
</tr>
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<th>Version</th>
<td>unspecified
</td>
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<th>Hardware</th>
<td>Other
</td>
</tr>
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<th>OS</th>
<td>All
</td>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>normal
</td>
</tr>
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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>
</tr>
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<th>Reporter</th>
<td>jeff.zheng@intel.com
</td>
</tr>
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<th>QA Contact</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
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<th>CC</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr></table>
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<div>
<pre>Created <span class=""><a href="attachment.cgi?id=112531" name="attach_112531" title="testdisplay -a output">attachment 112531</a> <a href="attachment.cgi?id=112531&action=edit" title="testdisplay -a output">[details]</a></span>
testdisplay -a output
==System Environment==
--------------------------
BIOS version V53
Regression: Yes. I tried _drm-intel-testing 2014_12_06 commit and testdisplay
shows normal.
Non-working platforms: BSW
==kernel==
--------------------------
-testing: 2015_01_18 commit 6dd5bb25ce0ed3a0012b69d553d74e1a0d39c313(test
fails)
==Bug detailed description==
-----------------------------
Boot BSW, login and run testdisplay, eDP screen shows abnormal sometimes
testdisplay -a, or -d 24 will show abnormal. HDMI and DP screen also some
similar abnormal behavior.
The reproducibility > 90%
==Reproduce steps==
----------------------------
1. Boot BSW, login and run testdisplay
==Bisect==
I tried to bisect, but unfortunately because of <a class="bz_bug_link
bz_status_VERIFIED bz_closed"
title="VERIFIED FIXED - [BSW Bisected] eDP screen is blank when external HDMI monitor is connected"
href="show_bug.cgi?id=87671">bug 87671</a>, some commits cannot
be bisected, in which commits testdisplay will show black screen.
Bad commit: 9025452366e9a86f2e11292865d98430341005d1 : Revert "drm/i915:
Parsing LFP brightness control from VBT"
Good commit: d9d8e6b3c01386e5b39b70dc07156ff0e407d984: the commit before
"drm/i915: Parsing LFP brightness control from VBT"
testdisplay will show black screen with commits between these two commit,
including commit 371abae844ede392066bfc21202b2e40f4a654d1: "drm/i915: Parsing
LFP brightness control from VBT"</pre>
</div>
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