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Problem: The login window on lightdm on my Ubuntu 18.04 distribution keeps appearing on the wrong monitor (my left-most monitor). I have three monitors, the monitor I want it to appear on is DP-4 (my middle monitor). If I login and then logout, it then appears on my third monitor (right-most monitor) for some reason, which is still incorrect.

What I've tried:

Option 1) Edited /etc/lightdm/lightdm-gtk-greeter.conf:

[greeter]
active-monitor=1

Tried values of 0, 1, 2, 3 and 4. Not sure what other values I can try, didn't work.

Option 2)

Created and edited /usr/bin/dualmonitors.sh and chmod'd it:

#!/bin/sh
xrandr --output DP-4 --primary

Created and edited /etc/lightdm/lightdm.conf.d/01_my.conf:

[SeatDefaults]
user-session=ubuntu
greeter-session=unity-greeter
allow-guest=false
display-setup-script=/usr/bin/dualmonitors.sh
session-setup-script=/usr/bin/dualmonitors.sh

Option 3) /etc/lightdm/lightdm.conf file doesn't exist by default for some reason, only /etc/lightdm/lightdm.conf.d/ directory exists, made the lightdm.conf file anyways and edited it with the same contents as 01_my.conf:

[SeatDefaults]
user-session=ubuntu
greeter-session=unity-greeter
allow-guest=false
display-setup-script=/usr/bin/dualmonitors.sh
session-setup-script=/usr/bin/dualmonitors.sh

Results: Nothing works. Login window appears on left-most (first) monitor on startup, and then appears on right-most (third) monitor after logging out, never once appearing on the middle (second) monitor which is what I want.

Ran Shorowitz
  • 211

1 Answers1

1

I have two monitors, and the left one is primary. UEFI, grub, and my login session all recognize that correctly, but the LightDM login screen has it backward.

I used option 1 with a value of zero, and that fixed it for me:

[greeter]
active-monitor=0
John Bunch
  • 11