Sorry, I just retested the acpi_backlight=vendor parameter in grub, and
with the latest updates its working perfect.. The last time I've tested
was in jaunty. This really fixed and works perfect.

I've just updated my /etc/default/grub with that option and the changed line 
its just like this:
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash nomodeset i8042.nomux 
acpi_backlight=vendor"

Just to explain: 
- nomodeset: makes something show up in the screen (fix the videodriver)
- i8042.nomux: makes the touchpad button work.
- acpi_backlight=vendor: fix the brightness problem.

Now just do the update-grub cmd. Remeber that this changes need root
privilegies, so "sudo su" or "sudo <cmd>"

-- 
Acer Aspire 5738 cannot change brightness at all
https://bugs.launchpad.net/bugs/489041
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