even doing something like this don't work :(

lspci | grep VGA
00:02.0 VGA compatible controller: Intel Corporation Mobile GM965/GL960 
Integrated Graphics Controller (rev 03)

second :
setpci -s 00:02.0 F4.B=66 (a value between 00 and FF, where FF is 100%)

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brightness dark and not working on acer 5715
https://bugs.launchpad.net/bugs/401591
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