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Since the original problem has been solved by rebooting onto your question of how to force resolution...

You could try to create a mode line with cvt tool with following syntax:

cvt widthinpx heightinpx refreshrate

example:

cvt 1920 1080 60
xrandr --newmode "1920x1080_60.00"  173.00  1920 2048 2248 2576  1080 1083 1088 1120 -hsync +vsync
xrandr --addmode VGA-0 1920x1080_60.00

source: Ubuntu forums - How to set a custom resolution?