I have an ASUS A55V which comes with the infamous nVidia Optimus chipset. I installed bumblebee, and tested it correctly with optirun glxspheres. The problem is that I cannot change the screen resolution, from both the nVidia Panel and the Ubuntu Display utility, which is fixed at 640x480. The strange thing is that if I attach an external monitor, it's correctly detected and I can configure it normally with a decent resolution.

Laptop screen's resolution is fixed no matter if the external monitor is plugged in or not. And a curious thing is that even if the external monitor is unplugged, it still shows at the nVidia settings...

Any hints on how to solve this?

EDIT: using xrandr seems to work to add a new resolution and set it up, but the display is limited to the center of the screen. Here's a screenshot so you know what I mean:

Thanks in advance