http://bugzilla.kernel.org/show_bug.cgi?id=9995





------- Comment #46 from [EMAIL PROTECTED]  2008-03-19 20:00 -------
(In reply to comment #45)
>>  Or we will have X.org changing the brightness directly in
> > hardware, and ACPI video will know it must *block* (even for reading!) any
> > attempts to access the ACPI AML backlight methods.
> Yes, currently users can still access the ACPI backlight methods via the
> backlight sys I/F, even with "brightness_switch_enabled=N".
> Another switch is needed to control the access via backligh sys I/F.

we don't have this problem for Intel GPUs with IGD OpRegion support.
The AML backlight methods won't change the backlight directly but try to notify
the graphics driver instead. :)


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