[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 #15 from Manuel Ullmann <ullman.bugs@gmx.de>  2010-02-05 21:58:45 ---
I guess you took in account, that waiting the 5 minutes is important. Cause I
wrote in Comment #1 already, that LID closing and opening within this time
amount is not the problem (radeon disables and enables the monitor fine). But I
guess it is as you said a problem of new hardware.

I just reproduced it and found, that the system freeze differs slightly from
that of the brightness-changing. While the sound-mute-LED changes her color as
usual from yellow to blue and back, if pressed after a system freeze through
brightness-changing, it does not, when the freeze is caused by closing LID (and
waiting 5 min.). All other symptoms are the same (sysrq not working,
USB-devices not powered etc.). Triggering the other LEDs seems to work; they
are dimmed and brightened as usual, when pressed (on both freezes). The
Wireless-LED of course does not work, because the (USB-)wireless-chip has to be
initialized before. 

Ah, and I asserted, that Knoppix 6.1 freezes on boot, when I booted it without
acpi=off. But all other linux distributions didn´t have that problem (including
an installed Gentoo and Ubuntu and Live CDs like grml and dsl) so I guess it is
not relevant. (Knoppix 6.1 had kernel version 2.6.28.4)

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