Login screen appears on only one monitor and it's not the one I want

Bug #1760849 reported by Stuart Bishop on 2018-04-03
210
This bug affects 32 people
Affects Status Importance Assigned to Milestone
GNOME Shell
Unknown
Unknown
gnome-shell (Ubuntu)
Medium
Unassigned

Bug Description

Upstream bugs:
https://gitlab.gnome.org/GNOME/gdm/issues/168
https://gitlab.gnome.org/GNOME/gdm/issues/183
https://gitlab.gnome.org/GNOME/gdm/issues/195
https://gitlab.gnome.org/GNOME/gdm/issues/319
https://gitlab.gnome.org/GNOME/gdm/issues/372
https://gitlab.gnome.org/GNOME/gnome-shell/-/issues/3867

The Ubuntu login screen is tiled on all displays, not mirrored, making it nearly impossible to login when using an external monitor if the laptop screen is not visible.

There appears to be no available control to alter the display settings of the login screen. Prior to bionic, the controls followed the mouse onto different displays so you could login by giving the mouse a swipe to the right to get the controls to appear.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: gdm3 3.28.0-0ubuntu1
ProcVersionSignature: Ubuntu 4.15.0-13.14-generic 4.15.10
Uname: Linux 4.15.0-13-generic x86_64
NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
ApportVersion: 2.20.9-0ubuntu2
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Tue Apr 3 22:13:53 2018
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_AU.UTF-8
 SHELL=/bin/bash
SourcePackage: gdm3
UpgradeStatus: No upgrade log present (probably fresh install)

Stuart Bishop (stub) wrote :
Stuart Bishop (stub) on 2018-04-04
summary: - Unable to login unless primary display avaiable, not mirrored
+ Unable to login unless primary display available, not mirrored

Thank you for taking the time to report this bug and helping to make Ubuntu better. This particular bug has already been reported and is a duplicate of bug 1723025, so it is being marked as such. Please look at the other bug report to see if there is any missing information that you can provide, or to see if there is a workaround for the bug. Additionally, any further discussion regarding the bug should occur in the other report. Feel free to continue to report any other bugs you may find.

tags: added: multimonitor
Stuart Bishop (stub) wrote :

I don't think this is a dupe of Bug #1723025, which is discussing behavior when a screen is disabled such as a laptop being closed while an external monitor is connected. In my case, the laptop screen is not disabled (the laptop is not designed to operate with the lid closed). The laptop screen simply cannot be seen when using the external monitor and keyboard due to its physical positioning.

Ideally, for this bug to be fixed the screens would be mirrored and the login screen displayed on all screens. Fallback would be to implement previous release behavior, where the login controls followed the mouse pointer and would appear on whatever screen the mouse pointer is moved to.

It's a different project that implemented "login controls followed the mouse".

I know many people would like to see the same in gdm3. It just hasn't been done yet.

Please log a request for the feature here:
  https://bugzilla.gnome.org/enter_bug.cgi?product=gdm
and then let us know its URL.

summary: - Unable to login unless primary display available, not mirrored
+ Enhancement: Make the login screen follow the mouse to other monitors
Changed in gdm3 (Ubuntu):
importance: Undecided → Wishlist
status: New → Incomplete
Stuart Bishop (stub) wrote :
Changed in gdm3 (Ubuntu):
status: Incomplete → New
Changed in gdm:
importance: Unknown → Medium
status: Unknown → Confirmed
Changed in gdm3 (Ubuntu):
status: New → Confirmed
Changed in gdm:
status: Confirmed → Expired
Stuart Bishop (stub) wrote :

Upstream issue shuffled to to https://gitlab.gnome.org/GNOME/gdm/issues/372

Changed in gdm:
importance: Medium → Undecided
status: Expired → New
description: updated
Daniel van Vugt (vanvugt) wrote :

Reworded the bug title because I keep finding duplicates of this issue and it's hard to direct people here while the bug title only describes one possible solution instead of describing the problem. Other people have requested other solutions like honoring their account's own primary monitor preference as a global setting.

In general it's good bug hygiene to describe the problem only.

summary: - Enhancement: Make the login screen follow the mouse to other monitors
+ Login screen appears on only one monitor and it's not the one I want
Changed in gnome-shell (Ubuntu):
status: New → Confirmed
Changed in gdm3 (Ubuntu):
importance: Wishlist → Medium
Changed in gnome-shell (Ubuntu):
importance: Undecided → Medium
Daniel van Vugt (vanvugt) wrote :

That said, I personally agree that mirroring the login screen on all monitors would be best.

wen efil (bangkokguy) wrote :

I switched to lightdm but the problem still exists: if I attach an external monitor to my laptop, no login screen appears, nevertheless, I can enter my credentials blind, and than everything's fine.
If I boot with nomodeset than at least the login is ok. I've got a dell laptop with integrated intel video.

Timo Suoranta (tksuoran) wrote :

I have exactly the same issue. This is really annoying bug.

Timo Suoranta (tksuoran) wrote :

I agree mirroring login screen to all displays is the ideal default behavior.

Chris Rainey (ckrzen) wrote :

WORKAROUND: replace gdm3 with slick-greeter + lightdm-settings + gnome-screensaver + numlockx(optionally)

Greeter will auto-appear on whichever screen your mouse is on or moves to, dynamically.

See: https://bugs.launchpad.net/ubuntu/+source/gdm3/+bug/1820423

Changed in gdm:
importance: Undecided → Unknown
status: New → Unknown
description: updated
description: updated
description: updated
description: updated
description: updated
Changed in gdm:
status: Unknown → New
Changed in gdm3 (Ubuntu):
importance: Medium → High
status: Confirmed → Triaged
Diego (diego-giglio) wrote :

Are there some solution for it?

Diego (diego-giglio) wrote :

In addition, for me, install lightdm solve the problem. Now, I can see login screen on both monitors :)

Changed in gdm:
status: New → Unknown

This still happens on Ubuntu 20.04 (Focal), too. In my case, I have one external monitor which is mirrored. But the login screen appears only on the laptop's screen but not on the external monitor's display.

Paul White (paulw2u) on 2020-07-17
tags: added: focal
isaac (isaac-mao) wrote :

same issue here, on Ubuntu 20.04(Focal)

David Pérez Terol (ter0x) wrote :

Hello!

I am experimenting the described behaviour in Ubuntu 20.04.1

Daniel van Vugt (vanvugt) wrote :

Moved to gnome-shell. Any graphical aspect of the login screen is implemented in gnome-shell, not gdm.

Changed in gdm3 (Ubuntu):
status: Triaged → Invalid
affects: gdm → gnome-shell
Changed in gnome-shell (Ubuntu):
status: Confirmed → Triaged
no longer affects: gdm3 (Ubuntu)
description: updated
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