A simple workaround without manual editing of /etc/X11/xorg.conf:
temporary arrange both monitors in a diagonal way in Gnome Screen Resolution.
This forces Gnome to adjust Virtual resolution to a higher value. Gnome will ask you to log out and after login, all resolutions of the external monitor will be visible.
A simple workaround without manual editing of /etc/X11/xorg.conf:
temporary arrange both monitors in a diagonal way in Gnome Screen Resolution.
This forces Gnome to adjust Virtual resolution to a higher value. Gnome will ask you to log out and after login, all resolutions of the external monitor will be visible.