I have the same bug on my Sony Vaio-SZ95 laptop.
The default script "/etc/acpi/sonybright.sh" in Hardy beta does not seem to
work.
You can try replacing it my workaround bellow (mainly inspired by "Matt"'s
comment at
"http://moelhave.dk/gnulinux-ubuntu-gutsy-gibbon-710-on-the-sony-vaio-sz6-series/")
[Note that this script uses "/etc/acpi/var/brightness" file so, you have to
create it]
#!/bin/bash
function adjust
{
BRIGHTNESS=$1
if [ $BRIGHTNESS -ge 9 ]; then
BRIGHTNESS=9
fi
if [ $BRIGHTNESS -le -9 ]; then
BRIGHTNESS=-9
fi
echo $BRIGHTNESS >/etc/acpi/var/brightness
B=0.$BRIGHTNESS
B=$(echo $B | sed -e {s/0.-/-0./})
echo “adjusting brightness to $B”
/usr/bin/nvidia-settings -c ":0.0" -V -a Brightness=$B 2>/tmp/sonybright.log
}
BRIGHTNESS=$(cat /etc/acpi/var/brightness)
if [ "x$1" = "xdown" ]; then
BRIGHTNESS=$(( $BRIGHTNESS - 1 ))
adjust $BRIGHTNESS
elif [ "x$1" = "xup" ]; then
BRIGHTNESS=$(( $BRIGHTNESS + 1 ))
adjust $BRIGHTNESS
else
echo >&2 Unknown argument $1
fi
--
unable to adjust screen brightness on recent Sony Vaio notebooks
https://bugs.launchpad.net/bugs/173652
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