I just installed Ubuntu 12.04 on my new laptop. After testing some things with the liveCD. When I ran Ubuntu with the liveCD I could choose between a number of different resolutions for my display, but after installing Ubuntu on my hard drive there's only one option left (highest available res).
How do I get all the different resolution options back like they were presented on the liveCD?
EDIT: I just reinstalled the whole OS for a different reason, and it seems the non-proprietary graphics driver can handle different resolutions. The proprietary nvidia drivers (both 304 and 319) can only use the full resolution at 2880x1620.
EDIT2: I still got no answer to why the nvidia-drivers don't support lower resolutions, but I found a workaround. By running
xrandr --output DP-0 --scale 0.75x0.75 I can scale everything down by 25%. This makes Ubuntu usable again, even tough I loose some of the "crispness". That would be expected by running at a lower resolution anyway.