How do I fix a dark screen on HP Folio 13?

I am running Ubuntu 12.10.

Someone can explain me how to do to see in my notebook, because works perfectly but has a lighted display, I love Ubuntu and I use it on my notebook, thanks.

_{This is an automated translation from the original question in Spanish.}

1 Answer

A quick search yielded this post in the forums:

Try using this command on the shell:

sudo setpci -s 00:02.0 F4.B=90

If you want you can change the last number for any hexidecimal number from 00 to FF.