Comment 3 for bug 1069186

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Rafał Ochmański (rmopl) wrote : Re: problem with backlight

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.