Ubuntu 10.10 brightness problem in Acer Aspire 4741

To those who have problem with brightness configuration after installing Ubuntu 10.10 and you are using Acer Aspire 4741, here's a solution for you:

1. sudo gedit /etc/default/grub
2. Change the line GRUB_CMDLINE_LINUX="" into
   GRUB_CMDLINE_LINUX="acpi_osi=Linux"
3. sudo update-grub
4. Restart your linux
   

Hopefully it helps.