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Configure monitors for login screen

asked 2013-12-03 17:32:55 -0500

zadeluca gravatar image

updated 2014-04-11 16:31:22 -0500

remjg gravatar image


I have a triple-monitor setup, and by default they were all out of order. I was able to configure the order and select my preferred default monitor, and that works fine for my user account.

I did the same thing for the root user, assuming those settings would also be used for the login screen, but I was wrong. What do I need to do? Does the login screen run as user gdm? And I have to somehow change the settings for that user?

Thanks, Zach

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answered 2013-12-03 17:41:46 -0500

zadeluca gravatar image

To answer my own question:

Copy the monitor configuration file from a user account where it is configured properly to the gdm directory:

cp /root/.config/monitors.xml /var/lib/gdm/.config/

There should be a more intuitive way to accomplish this, and hopefully there is, but this works at least...

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Very bad, for me it didn't work on Fedora 22. :-( Other ideas?

erik gravatar imageerik ( 2016-02-16 09:57:41 -0500 )edit

THANK YOU!!! THANK YOU!!! THANK YOU!!! I was trying to fix it for years also.

ssr gravatar imagessr ( 2018-07-12 11:45:03 -0500 )edit

answered 2016-07-26 03:23:23 -0500

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Thank you very much for sharing this!!! It took me ages to find a solution, and now after doing this it works.

Further: (I use fedora 24) In the startup of your computer there are 3 times that the resolution and refresh rate can be configured:

  1. grub
  2. xorg startup screen
  3. xorg user screen

Because the standard resolution doesnt work well with my monitor (why i still dont know) I wanted to change the resolution from 2560x1440 (144Hz) to 2560x1440 (120 Hz). I can tell you: that's a pain. (for me :-))

1. grub

First in grub you can change the resolution and refresh rate with grubby. In /etc/default/grub I have added: GRUB_CMDLINE_LINUX_DEFAULT="video=2560x1440@60" GRUB_GFXMODE="1920x1080,1280x1024" (the first line, (almost not documented), saved my life) after changing it, I typed: grub2-mkconfig -o /boot/efi/EFI/fedora/grub.cfg (and not /boot/grub.cfg because I use EFI) Restart and the first config was changed succesfully with a refresh rate of 60HZ (120Hz didnt work)

2. xorg startup screen

cp /root/.config/monitors.xml /var/lib/gdm/.config/

3. xorg user screen

this resolution I've changed with the display manager in Xwindows

Further I have tried it with xorg.conf and /etc/X11/xorg.conf.d/XX-monitor.conf but unfortunately in Fedora 24 I can't get it work. It looks like xrandr or another proces is overruling those parameters.

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Asked: 2013-12-03 17:32:55 -0500

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Last updated: Jul 26 '16