Start in recovery mode then in terminal:
sudo dpkg-reconfigure xserver-xorg
Choose vesa driver
and
the size of the screen you want to use.(disable all the others)
and
save xorg file
Type: Posts; User: pietjanjaap; Keyword(s):
Start in recovery mode then in terminal:
sudo dpkg-reconfigure xserver-xorg
Choose vesa driver
and
the size of the screen you want to use.(disable all the others)
and
save xorg file