I just installed bumblebee on a Dell XPS L502X. It basically works:
optirun glxspheres does exactly what it should.
However, X is running with a resolution of 640x480. I can try to change settings with
optirun nvidia-settings -c :8 (as suggested on the bumblebee wiki), but in the relevant section it only lists resolutions up to 640x480.
/etc/bumblebee/xorg.conf.* files, there are no
Screen sections. Adding them doesn't change anything.
How can I change the resolution?