Linux add native resolution for external monitor

First you need to check the list of supported modes. When running the command

xrandr -q

it shows me (for my netbook with external monitor) two displays: LVDS1 and VGA1. VGA1 is the external monitor but xrandr doesn't recognize it's native resolution.

We can generate the mode we want to add with the following command:

cvt 1680 1050

The output should be Modeline and then some text. We create the new mode with the following command:

xrandr --newmode "1680x1050_60.00" 146.25 ...... + vsync

The last step is to associate it with the display:

xrandr --addmode VGA1 "1680x1050_60.00"

Now you should be able to select the correct resolution for the external monitor

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