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.
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 LINUX=" acpi_backlight= vendor"
Change this line to be : GRUB_CMDLINE_
call update-grub as root, reboot.