https://bugzilla.kernel.org/show_bug.cgi?id=63931
vac...@bohata.net changed:
What |Removed |Added
----------------------------------------------------------------------------
Component|ACPICA-Core |Power-Video
--- Comment #21 from vac...@bohata.net ---
Same or similar problem on earlier kernels too. On 3.8 kernel after a longer
time and some wake ups from suspend to ram - sometimes same problem appears
(even worse - it takes more than 4 seconds to switch the level). So the problem
appears before the commit - sometimes, after the commit - always.
Only workaround is to enable "Option "Backlight" "intel_backlight"" in
xorg.conf which does not help for a long time because after reaching some
brightness level, the system begins to use dell_brightness (I dont know why).
So with the backlight directive in xorg.conf it is neccessary to boot with
acpi_backlight=vendor and then blacklist the vendor module (dell_laptop in my
case) so only intel brightness control appears. Is there a better alternative
than completely disable dell_laptop? Something like acpi_backlight=disable?
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