| 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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