Томица, you have to open up terminal and:
1. sudo gedit /boot/grub/menu.lst
2. Find there a line which starts with GRUB_CMDLINE_LINUX_DEFAULT and add 
before the ending quotation mark acpi_osi=Linux
3. save the file
4. sudo update-grub
And that's it. It should work, when you'll restart computer.

-- 
LCD Brightness won't Change - intel 4 series
https://bugs.launchpad.net/bugs/392948
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