Hrm, well the module didn't load:
[ 8.474] (EE) NVIDIA: Failed to load the NVIDIA kernel module. Please check your
[ 8.474] (EE) NVIDIA: system's kernel log for additional error messages.
[ 8.474] (II) UnloadModule: "nvidia"
[ 8.474] (II) Unloading nvidia
[ 8.474] (EE) Failed to load module "nvidia" (module-specific error, 0)
[ 8.474] (EE) No drivers available.
But it loaded fine before:
[ 9.594] (**) NVIDIA(0): Depth 24, (--) framebuffer bpp 32
Have you installed all updates? There was a bug open on this but it's been closed as fix released: