[LTS Upgrde] Login Screen Resolution issues

[Michele]

>  I tried your solution (with and without the extra options "-phigh"),
>  restarted the xserver, and the _login-screen_ still has the incorrect
>  resolution. The display resolution is fine during a normal gnome
>  session.
>

Hello,

what helped me was to add the following subsection to the screen section
Section Screen
...
  DefaultDepth  24
  SubSection "Display"
		Depth     24
		Modes    "1280x1024" "1024x768" "800x600"
  EndSubSection
...
EndSection

The *first* mode is the one used by gdm

Don't forget to save a backup copy of xorg.conf in case the system
refuses to start!

cd /etc/X11/
sudo cp xorg.conf xorg.conf.working_backup
before starting the editing

and
cd /etc/X11/
sudo mv xorg.conf.working_backup xorg.conf

if something bad happens :-)

Cheers,

Michele