these errors were introduced in 9625beta
-october 2006 and they're still not fixed (one year passed...w00t)
1.0-8776 works fine
1.0-9625beta corrupted screen/hard lock
1.0-9742beta Installer warns me that my video card is not supported by the driver, yet i did not see anything mentioned in the Changelog, and the README says my card is supported. Loading the module would yield a similar error.
1.0-9629/9631/9639/9643: logo + freez or if i move the mouse i might get it to enter into GNOME/Xfce, but the screen is corrupted, after a minute or so, X will crash back to a screen corrupted GDM, Xid errors, w/ or w/o composite
see dedicated thread
(it gets interesting from page 7
@rahuljawale: your only chance is driver 8776+patch
the patch is needed for the driver to compile on newer kernels.
it works, at least you'll have a working driver (no Compiz/Beryl, but OpenGL/composite)