[Bug 15166] Changing brightness of backlight freezes kernel with radeon kms enabled.

[bugzilla-daemon@bugzilla.kernel.org]

http://bugzilla.kernel.org/show_bug.cgi?id=15166





--- Comment #13 from Manuel Ullmann <ullman.bugs@gmx.de>  2010-02-05 20:07:19 ---
@Rafał Miłecki:
Your bug should indeed not be related to this one, because, as you wrote in
your report, you switched to init 3 and disabled radeon (and kms, in
consequence) in your kernel configuration for testing purposes.

@Alex Deucher:
And you are using kms? Cause of course brightness-changing works fine, if
appending radeon.modeset=0 to kernel command line. If you are using kms, the
reasons for this bug are shrinking. The question is now: What has this notebook
series, what others don´t have? The first thing, that comes into my mind, is
UEFI with its BIOS. It changes the brightness, when the power cable is
unplugged (but actually there are other BIOSes like that and I´m wondering, why
this bug doesn´t occur without kms or with my old framebuffer driver uvesafb).

What you all could test, is the second way - I mentioned above - to reproduce a
system freeze. Actually this should be another bug, but I didn´t realize that
while writing the bug report.

Close the LID for ca. 5 minutes. Radeon should try to switch off the video
signal then and freeze the system. Switching on and off the monitor is no
problem.

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