Xrandr (X Rezise and Rotare) is a command line utility available in your Linux system for reseting and resizing your screen resolution. So, if there is any issues with your display, no problem you can fix it from a Terminal.
First You have to find the possible resolutions with xrandr -q
$ xrandr -q
Screen 0: minimum 320 x 200, current 1280 x 800, maximum 8192 x 8192LVDS1 connected 1280x800+0+0 (normal left inverted right x axis y axis) 331mm x 207mm 1280x800 60.0*+ 1024x768 60.0 800x600 60.3 56.2 640x480 59.9 VGA1 disconnected (normal left inverted right x axis y axis) HDMI1 disconnected (normal left inverted right x axis y axis) DP1 disconnected (normal left inverted right x axis y axis) DP2 disconnected (normal left inverted right x axis y axis)
Now you can set your resolution with command
$ xrandr -s 1024×768
More Details
$ man xrandr
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what if both monitor and graphics card can do higher but the resolutions are not showing how can you add the higher numbers ?