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I'm using multiple monitors.

When logged in everything is fine: The left monitor is positioned to the left and the right monitor is positioned to the right, but before I log in, the login-screen positions them the other way around.

This is also the position presented by bios and then the grub menu.

I don't mind where the login is displayed, but when moving the mouse, the boundary is the wrong way around and that's annoying.

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2 Answers 2

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57

I was experiencing this too. So long as you have your monitors configured as you want them in your user space then you should be able to follow these steps to set your monitors up the same way on the log in screen:

  • Open a terminal
  • Type sudo cp ~/.config/monitors.xml /var/lib/lightdm/.config/
  • Enter user password
  • Reboot your computer

Kudos goes to this post over here for pointing me in the right direction: Wrong Login Screen Resolution

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  • Just wanted to say that this also worked for getting the monitor rotation set up correctly for the login screen. Thanks for the solution. +1
    – reirab
    Mar 12, 2014 at 19:06
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    Thanks for pointing me in right direction but the same thing can be done with just one command from users home folder: sudo cp .config/monitors.xml /var/lib/lightdm/.config/
    – Tanel Mae
    Mar 14, 2014 at 17:26
  • This truly helpful solution!!!
    – Dmitry
    May 19, 2015 at 7:33
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    I got a permissions error after copying and rebooting, so I needed to sprinkle in some "sudo chown lightdm:lightdm /var/lib/lightdm/.config/monistors.xml". Otherwise, excellent!
    – Nick
    Nov 12, 2015 at 20:32
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    Along the same lines, I created a link with "sudo ln ~/.config/monitors.xml /var/lib/lightdm/.config/". It does the same thing but has the advantage of being alterable at a future date, without having to re-copy the config file each time the display layout is changed via the "Displays" GUI.
    – Rich.T.
    Apr 12, 2016 at 16:41
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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. This setting isn't available via the settings UI.

[greeter]
active-monitor=0

The monitors.xml workaround didn't work here, too.

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  • Doesn't work with lightdm unity greeter, which is what I'm willing to use.
    – Anwar
    Apr 1, 2017 at 13:34

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