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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 --- - backlight switches of when starting X since kernel-3.13"
href="https://bugs.freedesktop.org/show_bug.cgi?id=75917">75917</a>
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<th>Assignee</th>
<td>dri-devel@lists.freedesktop.org
</td>
</tr>
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<th>Summary</th>
<td>backlight switches of when starting X since kernel-3.13
</td>
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<th>Severity</th>
<td>normal
</td>
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<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>nl@gnuffy.net
</td>
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<th>Hardware</th>
<td>Other
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Version</th>
<td>XOrg CVS
</td>
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<th>Component</th>
<td>DRM/Radeon
</td>
</tr>
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<th>Product</th>
<td>DRI
</td>
</tr></table>
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<pre>After updating from linux 3.12.8 to 3.13 my display backlight
switches off when starting X.
The kernel doesn't crash, it just switched off the backlight.
Hardware name: Acer Aspire 3820T/JM31_CP, BIOS V1.19 10/27/2010
This is a notebook with an intel/radeon hybrid graphics.
I use intel for my X. I report this as radeon problem because
git bisect (on linux-stable tree) showed the following commit
as the cause of my problem:
10ebc0bc09344ab6310309169efc73dfe6c23d72 is the first bad commit
commit 10ebc0bc09344ab6310309169efc73dfe6c23d72
Author: Dave Airlie <airlied at redhat.com>
Date: Mon Sep 17 14:40:31 2012 +1000
drm/radeon: add runtime PM support (v2)
This hooks radeon up to the runtime PM system to enable
dynamic power management for secondary GPUs in switchable
and powerxpress laptops.
v2: agd5f: clean up, add module parameter
Signed-off-by: Dave Airlie <airlied at redhat.com>
Signed-off-by: Alex Deucher <alexander.deucher at amd.com>
Please let me know if you need addititonal information.</pre>
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