I get the same problem. The only thing I can see in /var/log/Xorg.?.log is a warning that IgnoreEDID is deprecated. I have a 24bit default colour depth, in case that makes a difference, as I also see the following:
(**) NVIDIA(0): Depth 24, (--) framebuffer bpp 32 -- using nvidia-glx drivers on toshiba satellite 1410 freezes https://launchpad.net/bugs/35251 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
