Can not change brightness and volume - but it shows thenm changing ...

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http://crunchbang.org – 1. Installed xbacklight, and when I try xbacklight -set XX or -dec XX or -inc XX - it gives me:No outputs have backlight property 2. I tried also withsudo setpci -s 01:00.0 F4.B=50("lspci -nn | grep VGA" returned "01:00.0 VGA ...")But it did nothing. Restarted - and still the same. The screen brightness just burns my eyes. (HowTos)