Hey,
I am afraid that Noveau currently does not play nicely with newer cards. I
have had issues with my GeForce 450 as well as with a GeForce 610. You either
get no 3D acceleration at all and Mesas LVM Pipe or Nouveau is instable as
hell.
So far either the NVidia 8X00 family or the 9X00 familiy seem to be good
candidates for a Trisquel box with reasonable 3D performance. If you can live
wiht exchanging your GPU I would go for a used GeForce 9800GT. You often get
those for super low prices at e-bay. Often even with silent cooling solutions
already installed.
I mean something like this:
http://www.ebay.de/itm/Grafikkarte-Geforce-9800-GT-1024-Mb-DDR3-KFA2-SLI-PCI-Express-2-0-SLI-Brucke-/221292927696?pt=DE_Elektronik_Computer_Computer_Graphikkarten&hash=item3386161ad0
BTW: What you have be listing is the audio part of your GPU (for HDMI audio).
You need to do a lspci | grep VGA to post your GPU specs.
Regards,
Holger
