12

How can I set the location for the login screen with lightdm in a multi monitor setup.

If have two monitors (1920x1080) + (1920x1200) and currently after I boot the login is shown on the left (smaller) monitor. I would like to view it only on the right (bigger) monitor.

Switching the cables on the graphics card did not help, and I have already made the bigger screen my primary screen using xrandr:

xrandr --output DVI-1 --primary #big screen

After login my panel is on the primary screen but the login screen itself is shown on the other smaller screen. How can I configure lightdm to display the login only on the bigger screen.

lanoxx
  • 1,249

3 Answers3

11

At least with Ubuntu 16.04, which includes lightdm-gtk-greeeter 2.0.1, the following entry in /etc/lightdm/lightdm-gtk-greeter.conf can be used to fix the initial position of the login dialog on a certain monitor:

[greeter]
active-monitor=0

The xrandr workaround didn't work here, too.

Murphy
  • 1,737
5

This did the trick for me. Find out your primary screen:

$ xrandr

And create the file /usr/bin/dualmon.sh with the following command:

xrandr --output DVI-0 --primary

**Change DVI-0 for your primary screen.*

Make it executable:

sudo chmod +x /usr/bin/dualmon.sh.

And add it to /etc/lightdm/lightdm.conf file:

[SeatDefaults]
display-setup-script=/usr/bin/dualmon.sh
session-setup-script=/usr/bin/dualmon.sh

Regards!

Ben Orozco
  • 151
2

Once you find out your screen identifier as Ben suggested using xrandr then you can pick your desired display output (mine was called HDMI-1) and enter it direct in to the config file.

/etc/lightdm/lightdm.conf

Search for the line "display-setup-script" and change it to read:

display-setup-script=xrandr --output HDMI-1 --primary

Obviously replacing "HDMI-1" with your desired monitor, eg. "DVI-1" or "DP-1" for DVI or DisplayPort if not HDMI.

I currently use lightdm-webkit2-greeter so I don't have this option, but if you use the lightdm-gtk-greeter then you can do the following instead:

[greeter]
active-monitor=0

In the file /etc/lightdm/lightdm-gtk-greeter.conf

coxe87b
  • 561