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:
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.