I got problems some weeks ago with my NVIDIA G86 (8500 GT), supposedly due to the infamous 295.40 version of the driver. I got errror messges like NVRM: RmInitAdpterFailed. Tried varous sugestions about setting kernel acpi and memory options, but no luck.
I pulled in x-swat and got 302.17, if I remember correctly. It did not help.
People recommended xorg-edgers , so I pulled that in and got kernel 126.96.36.199 and nvidia 304.43 but the problem remained.
Getting slightly panicked, I tried to back back to vanilla 12.04, so I purged nvidia* and located and removed anything on the system that smelled nvidia.
I installed nouveau, cause people said it was great, but as it turns out, my card does not seem to be supported.
So now I fear that I have atmessed up system, and graphics is terrible. Any help would be appreciated.