Bug 68151 - Backlight brightness change causes freeze (radeon with KMS)
Summary: Backlight brightness change causes freeze (radeon with KMS)
Status: RESOLVED UNREPRODUCIBLE
Alias: None
Product: Drivers
Classification: Unclassified
Component: Video(DRI - non Intel) (show other bugs)
Hardware: x86-64 Linux
: P1 high
Assignee: drivers_video-dri
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2014-01-04 19:01 UTC by Fabian
Modified: 2014-06-20 19:13 UTC (History)
1 user (show)

See Also:
Kernel Version: 3.13-rc6
Subsystem:
Regression: Yes
Bisected commit-id:

Attachments
Output of hwinfo (669.00 KB, application/octet-stream)
2014-01-04 19:01 UTC, Fabian 		Details
Add an attachment (proposed patch, testcase, etc.)

Description Fabian 2014-01-04 19:01:35 UTC 
Created attachment 120871 [details]
Output of hwinfo

If I change the backlight brightness using the brightness keys on my keyboard, sometimes the system freezes. SysRq doesn't work. Mobility radeon 5470 with KMS enabled. I first noticed this when upgrading openSUSE from 12.3 (3.7.10) to 13.1 (3.11.6). I have to use "acpi_backlight=vendor" to disable acpi_video0, which isn't working and has a higher priority than radeon_bl0.

Reproducible: Always

The hwinfo was created with the older, working kernel running.
Comment 1 Michel Dänzer 2014-01-06 03:38:07 UTC 
Can you bisect?
Comment 2 Fabian 2014-01-09 16:21:38 UTC 
I'll try it but it'll take a while..
Comment 3 Fabian 2014-06-20 19:13:01 UTC 
I tried to bisect it but somehow it got very hard to reproduce at some point.
I had to change the backlight for almost a minute before it freezes and with the new 3.15.0-rc4 I'm running on I can't reproduce it with normal usage.
I can't tell for sure whether it's fixed, but it works definitely reliable enough for me, so closing as "unreproducible" for now.
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