I just upgraded from Ubuntu 12.04 to 12.10 and the max display resolution is only 1024 x 768. In 12.04 it was 1680 x 1060 and working fine. I have a Samsung SyncMaster 225BW Display and a Graphic card: GeForce GTX 550 Ti/PCIe/SSE2 on a Intel® Core™ i7-2600K CPU @ 3.40GHz × 8 64 bits. How do I get my resolution back.
I think you havent installed your graphics drivers for your nvidia card still.. install them from Additional Drivers ..and retry to set your resolution
Type in terminal command : sudo nvidia-settings