In my HP Folio 13 laptop with Ubuntu 13.04 the brightness control works with the slider in the system Brightness & Lock settings, but the brightness function keys don't. Also, the brightness level is set to maximum on every boot.
Is there a way to make them work and make the system keep the brightness level set in the previous session?
Some information about my laptop concering this issue:
ls /sys/class/backlight intel_backlight ls /sys/class/backlight/*/brightness /sys/class/backlight/intel_backlight/brightness lspci | grep -i vga 00:02.0 VGA compatible controller: Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller (rev 09) uname -a Linux folio13 3.8.0-19-generic #29-Ubuntu SMP Wed Apr 17 18:16:28 UTC 2013 x86_64 GNU/Linux