Resolution problems with added display

Hi there

I am experiencing problems when I add another display to my laptop via VGA. The display is not recognized and is labelled “unknown”. The correct resolution(1366x768) for the screen is also not available, only other, lower and out of scale resolutions are available.

I have not played around with any other screens, but this one does work on Windows and Ubuntu.

Does anyone have an idea of fixing this problem.

Thanks.