Workaround for UL30 (UL30A-A2 and others) brightness keys in Ubuntu 10.04 (Lucid)

EDIT (2011-05-11): this should also work for 11.04.

With some models of Asus ul30 family (mine is ul30a-a2), brightness hotkeys don’t work properly in Lucid.  They change the brightness somewhat randomly, also sometimes causing ACPI to “freeze”.

The actual bug is here:

https://bugs.launchpad.net/ubuntu/+source/linux/+bug/543294

The (temporary) workaround, originally from here:

Edit /etc/default/grub as root
Find, and change this line : GRUB_CMDLINE_LINUX=”acpi_backlight=vendor”
call update-grub as root, reboot.

Since not being able to run popular distros can be a dealbreaker for laptop buyers, here’s a summary of my experience with this laptop:

Question: How well does Lucid Lynx run on UL30A-A2?

Answer: Flawless, except for the brightness key bug mentioned above and screen flickers, which also has a workaround.

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