Comment 11 for bug 570659

Ok - I've solved my issues now:

After doing the above I found that fglrx package was still installed so:

sudo apt-get remove --purge fglrx

This still didn't work, so I reinstalled all the mesa drivers again:

sudo apt-get install libglw1-mesa mesa-utils libglu1-mesa libgl1-mesa-glx libgl1-mesa-dri --reinstall

forcing all my drivers back to normal for mesa

And now I can login with regular remix and run glxgears etc.