I can only confirm that Nouveau stopped working for me as well. My situation
was / is a bit different though since I did a fresh installation with
Trisquel 6.0 on a scrap box with a GeForce 5700 FX. Nouveau was working in
the fresh installation (I was playing OpenArena, Xonotic and Red Eclipse on
the box for testing). After some updates (I suspect the new kernel being
cause of the issue) Nouveau stopped working and glxinfo only reports lvmpipe
as OpenGL renderer (software OpenGL only). Enforcing Nouveau via xorg.conf
results in an error message inside Xorg.0.log that the Nouveau kernel module
is not loaded.
Funny enough a similar problem occurs when I install #! (Crunchbang, which is
Debian-based). Enforcing Noveau via xorg.conf results in a similar error
message inside Xorg.0.log. They also use a kernel 3.2 which is of course not
the Linux libre-kernel.
Running the NVidia blob (version 197) under #! shows that the hardware works
perfectly.
I suspect when I update the Trisquel box of my daughter to Trisquel 6.0 3D
acceleration will be gone as well.
