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Title says it all. Ubuntu 11.10 doesn't save my brightness settings between sessions. Everytime I boot up, the brightness is always at zero, and I always have to set it back to my preferred setting (at maximum). How can I ensure that my brightness preference will persist after reboot?

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The file /etc/rc.local add before line exit 0:

echo 5 > /sys/class/backlight/acpi_video0/brightness
exit 0

Where 5 is the brightness level from 0 to 10

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The max brightness is defined in /sys/class/backlight/acpi_video0/max_brightness. The default is 15 on my laptop. So if you want to set it to 50%, you should use echo 7. – amazingjxq Dec 3 '11 at 3:50
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