https://bugs.freedesktop.org/show_bug.cgi?id=83460
Priority: medium
Bug ID: 83460
Assignee: dri-devel at lists.freedesktop.org
Summary: [radeon regression] Backlight turned off since kernel
upgrade
Severity: normal
Classification: Unclassified
OS: Linux (All)
Reporter: spmf2004-freedesktop at yahoo.fr
Hardware: x86-64 (AMD64)
Status: NEW
Version: XOrg CVS
Component: DRM/Radeon
Product: DRI
Since the upgrade to Ubuntu kernel 3.13.0-35 (from 3.13.0-34), the screen is
very dark to the point it's unusable.
Backlight seems completely turned off. Using the brightness keys doesn't help.
It was working fine with 3.13.0-34.
I found that the offending patch is "drm/radeon: set default bl level to
something reasonable".
I reverted this patch and recompiled 3.13.0-35, and it solved the problem.
I also checked that this problem also affects mainline kernel 3.17rc3.
More technical details can be found on Ubuntu's bugtracker :
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1364148
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