Hi,

I saw in this simmilar bug with other acer laptop model this solution:

https://bugs.launchpad.net/bugs/489041

=======================
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>"
========================

I tried do the same thing on my karmic x32 on my acer 5732z and now when
i use the fn keys there are more than 6 steps changing the brightness
but nothing else, it is still not working.

-- 
Cannot change brightness on laptop acer aspire 5732 Z
https://bugs.launchpad.net/bugs/490610
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