[Trisquel-users] How to adjust brightness in Trisquel mini

[anandawardhana]

Hello, I just installed Trisquel mini 7 on a NEC versapro vy10a/c-3 netbook.  
I am unable to adjust the brightness using the function key or xbacklight.  
Brightness always remains at the highest point, and I find it extremely  
tiring when I use it continuously for a couple of hours

I've been using Trisquel 6 on a different laptop and it has no issue in  
adjusting the brightness. I cannot remember whether I had the same issue with  
it when I first installed (or if I got it fixed at some point).

How to fix this problem?