$ xrandr
Screen 0: minimum 320 x 240, current 800 x 600, maximum 1024 x 768
default connected 800x600+0+0 0mm x 0mm
1024x768 60.0
800x600 60.0* 56.0
640x480 60.0
320x240 60.0
$ xrandr --output default --mode 1024x768
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