Nvidia 6150 issue with libgl1-mesa-dri-experimental

Has anyone gotten libgl1-mesa-dri-experimental working with a Nvidia C51PV [GeForce 6150] which in my case is integrated onto motherboard?

After installing libgl1-mesa-dri-experimental and restarting GDM. I am able to log in and then see what appears to be the Gnome3 wallpaper (birds in lower right corner, blue vertical stripes) instead of Trisquel's default wallpaper?!

There is some video distortion in the top left and along the top - that may be the panel? No interaction seems possible.

Removing the driver, and restarting GDM returns the system to normal operation.

The default Nouveau driver is working great for all 2D operations, was just hoping to get some (even if very limited) 3D going.

Any input/hints/suggestions/personal experience(s)?