[GM965] dual monitor display not working after login in Xorg sessions (but Wayland works)

[James Battis]

Results from a clean install of 20.04 with a forced update.

When my system boots, the system comes up in dual monitor status (separated monitors). Once I log into my account the system reverts to a single monitor mode and the second monitor goes blank. If I attempt to change the display to dual monitors, both monitors are shown and defined correctly in the setup window (Built-in Laptop Monitor and HP 24"). However, once I click on apply, the system tries to reset to dual monitor, I would say several times, but fails and second monitor says that no signal is detected and to check the connection or cable.

However, if I run Ubuntu (older version) from a thumb drive I have no problem with the dual monitor.

I believe I am running the default video driver.
---
ProblemType: Bug
ApportVersion: 2.20.11-0ubuntu27.4
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
DisplayManager: gdm3
DistroRelease: Ubuntu 20.04
InstallationDate: Installed on 2020-07-25 (3 days ago)
InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423)
Package: gnome-shell 3.36.1-5ubuntu1
PackageArchitecture: amd64
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcVersionSignature: Ubuntu 5.4.0-42.46-generic 5.4.44
RelatedPackageVersions: mutter-common 3.36.3-0ubuntu0.20.04.1
Tags: focal
Uname: Linux 5.4.0-42-generic x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin lxd plugdev sambashare sudo
_MarkForUpload: True

[Daniel van Vugt (vanvugt)]

Thank you for taking the time to report this bug and helping to make Ubuntu better. Please execute the following command only once, as it will automatically gather debugging information, in a terminal:

  apport-collect 1889295

When reporting bugs in the future please use apport by using 'ubuntu-bug' and the name of the package affected. You can learn more about this functionality at https://wiki.ubuntu.com/ReportingBugs.

[James Battis (jcbnh-48)]

apport information

[James Battis (jcbnh-48)]

apport information

[James Battis (jcbnh-48)]

apport information

[James Battis (jcbnh-48)]

apport information

[James Battis (jcbnh-48)]

apport information

[Daniel van Vugt (vanvugt)]

Unfortunately that didn't get all the information we need. Please also run these commands:

  lspci -k > lspcik.txt
  journalctl -b0 > journal.txt
  xrandr --verbose > xrandr.txt

and attach the resulting text files here.

[Daniel van Vugt (vanvugt)]

Thanks. It looks like Xorg is the cause of this problem and Wayland (used on the login screen) works better. Please try selecting 'Ubuntu on Wayland' on the login screen (button at the bottom right) before entering your password and tell us if that improves the situation.

[James Battis (jcbnh-48)]

Daniel,

As requested, I enabled Wayland and logged in with 'Ubuntu on Wayland'.
The second monitor is now working.

Thank you.  I am very impressed with the quick turn around and support.

Jim Battis

On 7/30/20 10:11 PM, Daniel van Vugt wrote:
> Thanks. It looks like Xorg is the cause of this problem and Wayland
> (used on the login screen) works better. Please try selecting 'Ubuntu on
> Wayland' on the login screen (button at the bottom right) before
> entering your password and tell us if that improves the situation.
>
>
> ** Summary changed:
>
> - dual monitor display not working after login
> + [GM965] dual monitor display not working after login
>