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<base href="https://bugs.freedesktop.org/" />
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<th>Priority</th>
<td>medium
</td>
</tr>
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - [HSW 3.8.2 regression] After running testdisplay with only eDP, screen turn to black and can't light up again"
href="https://bugs.freedesktop.org/show_bug.cgi?id=62275">62275</a>
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<tr>
<th>Assignee</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
<tr>
<th>Summary</th>
<td>[HSW 3.8.2 regression] After running testdisplay with only eDP, screen turn to black and can't light up again
</td>
</tr>
<tr>
<th>QA Contact</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
<tr>
<th>Severity</th>
<td>critical
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
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<th>OS</th>
<td>All
</td>
</tr>
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<th>Reporter</th>
<td>yangweix.shui@intel.com
</td>
</tr>
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<th>Hardware</th>
<td>Other
</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>
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<th>Product</th>
<td>DRI
</td>
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<pre>Description:
----------------------------------
It's a new regression of HSW on 3.8.2 kernel:
[19b00d2dc9bedf0856e366cb7b9c7733ded659e4] Linux 3.8.2
I find 3.8 kernel is good:
[19f949f52599ba7c3f67a5897ac6be14bfcb1200] Linux 3.8
Our machine is lent to other team for a period, I will attach the attachment
later.
Reproduce step:
----------------------------------
1. reboot with bad commit kernel
2. ./testdisplay
3. After display the mode, then screen turn to black and can't light up again
Bisect result:
----------------------------------
719429a54d9c8fd32d457c7d564d1272d9003282 is the first bad commit
commit 719429a54d9c8fd32d457c7d564d1272d9003282
Author: Daniel Vetter <<a href="mailto:daniel.vetter@ffwll.ch">daniel.vetter@ffwll.ch</a>>
Date: Wed Feb 6 11:24:41 2013 +0100
drm/i915: write backlight harder
commit cf0a6584aa6d382f802f2c3cacac23ccbccde0cd upstream.
770c12312ad617172b1a65b911d3e6564fc5aca8 is the first bad commit
commit 770c12312ad617172b1a65b911d3e6564fc5aca8
Author: Takashi Iwai <<a href="mailto:tiwai@suse.de">tiwai@suse.de</a>>
Date: Sat Aug 11 08:56:42 2012 +0200
drm/i915: Fix blank panel at reopening lid</pre>
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