Comment 38 for bug 543294

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Minsang Kim (minsangkim) wrote :

In the mean time, a workaround has been found (from the UL30 mailing list)

http://ubuntuforums.org/showthread.php?t=1466758

Edit /etc/default/grub
Change this line to be : GRUB_CMDLINE_LINUX="acpi_backlight=vendor"
call update-grub as root, reboot.