When i dim the brightness  it goes from 100% to 20% , then if i increase
it goes from 20% to 30%, after that brightness can't be changed anymore.

This is the conversion :

in set brightness :   "$(( $value * 5 + 15 ))"

in get brightness : value=$(( ${value//%/ } /5 -3 ))

i changed it into  this : "$(( $value * 33 ))"

and this : value=$(( ${value//%/ } / 33 ))

It's not better but i prefer it. :P

-- 
No Screen Backlight Control; Sony Vaio with nvidia 8 series graphics
https://bugs.launchpad.net/bugs/95444
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