this is the output of #xrandr: bash-4.3# xrandr xrandr: Failed to get size of gamma for output default Screen 0: minimum 640 x 480, current 1280 x 1024, maximum 1280 x 1024 default connected 1280x1024+0+0 0mm x 0mm 1280x1024 0.00* 1024x768 0.00 800x600 0.00 640x480 0.00 1680x1050 (0x7d) 241.500MHz h: width 2560 start 2600 end 2632 total 2720 skew 0 clock 88.79KHz v: height 1440 start 1443 end 1448 total 1481 clock 59.95Hz how could I set the resolution to 1680x1050 . I have formely tried by installing the nvidia driver, but after a while the mouse and kbd usb stopped functioning again. I fixed the problem by removing nvidia. this time the mouse and kbd are functioning perfectely well. so I would like to have a better resolution (1680x1050) without nvidia driver.