OK, so the 1600×900 screen resolution that my laptop have is not supported.
Well – I have to admit that google sure have a lot of solutions for Ubuntu. far more than what I normally see for Centos/RedHat
I quickly found this: ubuntuforums
the commands:
xrandr –newmode “1600x900_60.00” 118.25 1600 1696 1856 2112 900 903 908 934 -hsync +vsync
xrandr –addmode Virtual1 “1600x900_60.00”
xrandr –output Virtual1 –mode “1600x900_60.00”
did the trick. The part about the initcode does not work for my version, so I will have to look into that later