I have an HP 650 notebook, and I just finished installing ubuntu 13.10 . The problem is that brightness function keys don't work ( f2 and f3 ). I tried changing GRUB_CMDLINE_LINUX_DEFAULT and updating grub but it doesn't work.
Directory /sys/class/backlight is empty.
and "lspci | grep -i vga" command outputs the following:
00:02.0 VGA compatible controller: Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller (rev 09)
Any help, please ?