On Thu, Dec 29, 2011 at 12:49:41PM +0100, Corentin Chary wrote:
> And that's ? Because new laptops that use SABI seems to have a working
> acpi_video0.
> Currently, N1{4,5}* seems to be affected.

You can add the NF310 to the list of machines without a working
acpi_video0. The disassembled DSDT is attached, and the backlight
control methods are a bit puzzling. _BCM seems to only accept values
that are multiples of 10, but _BCL returns several values that do not
meet this criterion. However, when _BCM is called with any of the values
from _BCL, even the ones that aren't multiples of 10, _BQC returns the
corresponding value. I must be missing something.

At any rate, no matter the value given to _BCM the brightness does not
change.