[Trisquel-users] problem with laptop keyboards

[alerussocell]

Hello all,
i'm a new gnu/linux users. In the past i have used it several times but since  
i have bought my new laptop i have decided to use gnu/linux only and leave  
windows forever. I usually have not any problems with Trisquel, but on this  
laptop i have 2 problems that i can't fit and I hope that someone can help  
me:

1) up, down, right arrow keys does not work. When i use terminal i'm using "  
8 , 4, 2, 6" with bloc num instead, but there's some situations in which i  
need arrow keys, and this is the most relevant issue and really need help

2) the other problems, not so important, is that i can't adjust the screen  
backlight (i usually use xbacklight, not working this time)