[Bug 83460] New: [radeon regression] Backlight turned off since kernel upgrade - bugzilla-daemon

From: bugzilla-daemon@freedesktop.org
To: dri-devel@lists.freedesktop.org
Subject: [Bug 83460] New: [radeon regression] Backlight turned off since kernel upgrade
Date: Wed, 03 Sep 2014 21:38:08 +0000	[thread overview]
Message-ID: <bug-83460-502@http.bugs.freedesktop.org/> (raw)

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https://bugs.freedesktop.org/show_bug.cgi?id=83460

          Priority: medium
            Bug ID: 83460
          Assignee: dri-devel@lists.freedesktop.org
           Summary: [radeon regression] Backlight turned off since kernel
                    upgrade
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: spmf2004-freedesktop@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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