https://bugzilla.kernel.org/show_bug.cgi?id=42833





--- Comment #6 from Lee, Chun-Yi <j...@novell.com>  2012-03-15 15:02:13 ---
(In reply to comment #5)
> Here is the output of the acpidump: http://pastebin.com/gyPzdt5i, and the
> dmidecode: http://pastebin.com/2xUeu8Uf
> When I try to run this (echo 5 > /sys/class/backlight/acpi_video0/brightness)
> command it said that the directory didn't exist.
> I run these commands when I boot the kernel with the "acpi_backlight=vendor"
> flag.

Sorry for cause you confuse.

Please REMOVE 'acpi_backlight=vendor' then run 'echo 5 >
/sys/class/backlight/acpi_video0/brightness' again.

Thanks

Per your description of bug, 
I think 'acpi_backlight=vendor' works to you for brightness control, right?

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