low display resolution

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http://askubuntu.com – At the beginning my screen resolution is 1680x 945 in Ubuntu 12.04. I found the computer is really hot then I try to install a new Nvidia display driver and installed bumblebee. I am not sure it's right approach or not. Then my display resolution is automatically adjusted to 1080 x 768. After that I cannot select the original resolution. Anyone knows how to fix this issue? my computer is Toshiba X505 Q885. The screen size is 18.3 inch. I am using geforce GTS 360M. Thank you. Best regards, George (HowTos)