I'm also affected by this on Ubuntu 12.10, a workaround is to set the desired default backlight brightness by adding
# brightness fix after boot echo 0 > /sys/class/backlight/acpi_video0/brightness
before exit 0
in /etc/rc.local. 0 is the minimum, usually, 0-15 can be used.
I'm also affected by this on Ubuntu 12.10, a workaround is to set the desired default backlight brightness by adding
# brightness fix after boot backlight/ acpi_video0/ brightness
echo 0 > /sys/class/
before exit 0
in /etc/rc.local. 0 is the minimum, usually, 0-15 can be used.