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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 --- - [i915] kernel 3.7-rc1 onwards. backlight on, screen dark after KMS kicks in during boot"
href="https://bugs.freedesktop.org/show_bug.cgi?id=57365">57365</a>
</td>
</tr>
<tr>
<th>Assignee</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
<tr>
<th>Summary</th>
<td>[i915] kernel 3.7-rc1 onwards. backlight on, screen dark after KMS kicks in during boot
</td>
</tr>
<tr>
<th>QA Contact</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr>
<tr>
<th>OS</th>
<td>Linux (All)
</td>
</tr>
<tr>
<th>Reporter</th>
<td>tmezzadra@gmail.com
</td>
</tr>
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<th>Hardware</th>
<td>x86 (IA32)
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Version</th>
<td>XOrg CVS
</td>
</tr>
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<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=70363" name="attach_70363" title="dmesg with drm.debug=0xe on kernel 3.7-rc4">attachment 70363</a> <a href="attachment.cgi?id=70363&action=edit" title="dmesg with drm.debug=0xe on kernel 3.7-rc4">[details]</a></span>
dmesg with drm.debug=0xe on kernel 3.7-rc4
as a reference, this is the original thread in the dri-devel mailing list.
<a href="http://lists.freedesktop.org/archives/dri-devel/2012-November/030565.html">http://lists.freedesktop.org/archives/dri-devel/2012-November/030565.html</a>
Computer boots correctly, but right after the mode is set by the i915 kernel
module. the display goes dark (backlight is on).
The display is restored with a suspend-resume cycle.
Attached is a dmesg output with drm.debug=0xe in the kernel boot parameters.
i did try to bisect this between 3.6 and 3.7-rc1 but other bugs in between make
this impossible. (lockups everywhere).
3.6.6 works correctly.
PS. The dirty mark on my kernel is due to skipping depmod with my build script.
The kernel has not been modified in any way, and no binary blobs are used with
it.</pre>
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