http://bugzilla.kernel.org/show_bug.cgi?id=15166
Summary: Changing brightness of backlight freezes kernel with
radeon kms enabled.
Product: Drivers
Version: 2.5
Kernel Version: 2.6.32.6
Platform: All
OS/Version: Linux
Tree: Mainline
Status: NEW
Severity: high
Priority: P1
Component: Video(DRI - non Intel)
AssignedTo: drivers_video-...@kernel-bugs.osdl.org
ReportedBy: ullman.b...@gmx.de
Regression: No
Created an attachment (id=24769)
--> (http://bugzilla.kernel.org/attachment.cgi?id=24769)
Xorg-log from a normal X startup.
Overview:
Changing the brightness of the backlight freezes the kernel, when radeon kms
(radeon.modeset=1) is enabled. Closing the LID for ca. 5 minutes does the same.
There are several ways to reproduce this:
1.
Step 1: Become root and enter the following:
echo 90 | dd of=/proc/acpi/video/*/LCD/brightness
The system should freeze.
2.
Step 1: If you have a laptop, you can close your LID and wait ca. 5 min. When
you open it, you shouldn´t get your screen on.
3.
Step 1: If you have KDE 4 with powerdevil installed, simply type: startx
I guess, the system freezes when powerdevil tries to get control about the
backlight.
Actual Results:
The system freezes.
Expected Results:
Changing the brightness should work. Switching on the monitor should work.
Build Date and Platform:
Build 2010-01-25 on Gentoo Linux 10.0
Additional Builds and Platforms:
Occurs also with Gentoo-kernel 2.6.32-gentoo-r2
Additional Information:
Hardware:
HP Compaq 6735b (FU308EA)
(Radeon HD 3200)
See also:
http://h10010.www1.hp.com/wwpc/uk/en/sm/WF06b/321957-321957-64295-3955547-3955547-3687779-3840808.html
Userspace-drivers were compiled from Gentoo x11-overlay.
The symptoms of the freeze are very similar to those of a kernel panic:
- MAGIC_SYSRQ is not working.
- New USB-devices are not powered.
- Mouse freezes.
- In console the cursor is disappearing.
But:
- Num Lock and Caps Lock LED are not blinking
- Caps Lock LED does not glow.
I could not boot the 2.6.33-rc5-kernel, because amd-ucode was missing. I will
fix it and test this version later.
I´ll attach Xorg-log.
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