http://bugzilla.kernel.org/show_bug.cgi?id=11682





------- Comment #13 from [EMAIL PROTECTED]  2008-11-04 17:50 -------
As you're using an ATI graphics card, it's true that both ACPI backlight I/F
(/proc/acpi/video... and /sys/class/backlight/acpi_videoX/...) and xbacklight
don't work for you.
First, xbacklight is designed for intel graphics. I don't know if it supports
nvidia or ati now, but I think the answer is "no".
Second, I checked your BIOS. Both integrated intel graphics and another
external ATI graphics are supported. But unfortunately, the ACPI backlight
sysfs I/F only works for the integrated intel graphics as well...

In order to control the backlight on your laptop, you need the help of some
platform specific tools. And you may want to goto freedesktop to see if you
have any luck. :)


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