Comment 99 for bug 542660

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kapouer (kapouer) wrote :

Update : EFI problems are getting solved (might be merged in linux 3.0),
and radeon need to have a vbios loaded to make it happy :
https://bugs.freedesktop.org/show_bug.cgi?id=26891

i found no way to change the backlight brightness, though.
There is /sys/class/backlight/acpi_video0/brightness, but i has no effect.
I t seems the acpi DSDT is only supporting backlight routines when booted in BIOS mode.
Anyone ?