Can't find optimal screen resolution
Solution 1:
Try first to define a VIRTUAL1 display:
xrandr --newmode "1440x900_60.00" 106.47 1440 1520 1672 1904 900 901 904 932 -HSync +Vsync
And use it to set the profile of VGA-1:
xrandr --addmode VGA-1 1440x900_60.00