According to this post[1], the Nouveau driver should work for that card. But on the 3.8 kernel, it seems that Trisquel 6.0 includes the 3.2 kernel[2].
Thanks for the links, lembas. I was about to ask someone to help with that. :p
[1] http://www.phoronix.com/scan.php?page=news_item&px=MTI2NTI [2] https://trisquel.info/en/trisquel-60-lts-toutatis-has-arrived
