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Monitors switched and resolution changed

Hi,

I have a laptop acer 14". I was using it with another monitor (LG 23MP55) through VGA. It was working fine, but today LG was not the primary monitor any more and its resolution changed (it was 1920x1080).

The "Display" app seems different from the last time I configured, and there's no option to choose 1920x1080. I tried to use xrandr, but "cannot find mode 1920x1080".

The "Display" app also show the laptop display bigger than LG display!!! :/

How can I fix it?