[cosmic] [regression] DisplayPort Monitor works only once and not anymore after switching VTs in gdm 3.30.0

[shemgp]

https://gitlab.gnome.org/GNOME/gdm/issues/420

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On Cosmic dev, I can't use my displayport monitor after logging in to gdm3. It works for login (displays the login page) after the VT switch to the session it becomes black. Using CTRL+f1, etc doesn't also show the console even in my VGA monitor.

Devices:
* Thinkpad x230t with Intel 3rd gen core processor and graphics unit.
* Laptop LCD.
* 4k monitor plugged in to display port.
* 1080p monitor plugged in to vga port.

The graphic's memory is not enough so I have to turn off the Laptop LCD to power 4k and 1080p monitors. When it boots, I can see the login screen in the 4k monitor.

To be able to login, what I do is unplug 4k monitor when booting and logging in. Once session is active, I plugin the 4k monitor.

Thank you for your work/help.

ProblemType: Bug
DistroRelease: Ubuntu 18.10
Package: gdm3 3.30.0-0ubuntu1
ProcVersionSignature: Ubuntu 4.17.0-9.10-generic 4.17.17
Uname: Linux 4.17.0-9-generic x86_64
ApportVersion: 2.20.10-0ubuntu9
Architecture: amd64
CurrentDesktop: GNOME
Date: Thu Sep 6 15:13:59 2018
EcryptfsInUse: Yes
InstallationDate: Installed on 2015-09-28 (1073 days ago)
InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422)
SourcePackage: gdm3
UpgradeStatus: Upgraded to cosmic on 2018-09-05 (0 days ago)
mtime.conffile..etc.gdm3.custom.conf: 2016-08-23T19:40:34.168140

[Daniel van Vugt (vanvugt)]

This would be related to both:

  * The new feature of gdm3 exiting/restarting when you switch VTs; and
  * Other recent changes to VT handling in Ubuntu 18.10 (gdm3, mutter).

I had hoped these issues would be fixed with bug 1786872 and bug 1786872 :(

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Daniel van Vugt (vanvugt)]

* I had hoped these issues would be fixed with bug 1786872 and bug 1786883.

[Daniel van Vugt (vanvugt)]

Please report the issue to the Gnome developers here:

  https://gitlab.gnome.org/GNOME/gdm/issues/new

and then tell us the new bug ID.

[Daniel van Vugt (vanvugt)]

This might be my old friend; bug 1775764 again.

[shemgp (shemgp)]

More testing when using a DisplayPort connected to a 2k monitor:
I am able to do user switching flawlessly, but when I do a VT switch to the console and switch between the ttys for a while and login to one of them and then logout; if I go back to CTRL+f1 and I see the a cursor blinking and a black screen, that's my signal that my user sessions might already have died. After a while the gdm screen will show up and I am able to login to an account, but it will be a fresh one and the apps that were loaded before are gone. It's like the user session's where killed. Maybe when gdm restarted. Sometimes it works though, and I am able to relogin to my GUI session, especially if I don't see that cursor blinking with a black background.

Btw, I am not able to find the GUI logged in sessions in CTRL+f1..nor f2.. f3.. etc. I can only go to ctrl+f1 though and see GDM.

[shemgp (shemgp)]

Here's the bug report in GNOME Gitlab: https://gitlab.gnome.org/GNOME/gdm/issues/420

[Daniel van Vugt (vanvugt)]

Thank you for reporting this bug to Ubuntu.
Ubuntu 18.10 (cosmic) reached end-of-life on July 18, 2019.

See this document for currently supported Ubuntu releases:
https://wiki.ubuntu.com/Releases

We appreciate that this bug may be old and you might not be interested in discussing it any more. But if you are then please upgrade to the latest Ubuntu version and re-test. If you then find the bug is still present in the newer Ubuntu version, please add a comment here telling us which new version it is in and change the bug status to Confirmed.