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Brightness setting on Acer Aspire – Ubuntu

How to solved Brightness key Acer Aspire on Ubuntu 10.x or 11.x ?

In my sample using ubuntu oneiric ocelot 11.10.

sudo gedit /etc/default/grub

Change GRUB_CMDLINE_LINUX=”” to GRUB_CMDLINE_LINUX=”acpi_osi=Linux”;

sudo update-grub.

reboot your system and enjoy!! The brightness button should be working now!