Flickering screen with ultra-wide monitor in Wayland mode

[Krister Swenson]

1. leave computer until gnome-shell blanks the screen (monitor goes to sleep)
2. clear GDM screen by swiping up.

There is a video flicker now when I interact with computer.
Usually small, but can cover many different UI elements.

This does not happen if I use the X backend instead of wayland.

ProblemType: Bug
DistroRelease: Ubuntu 17.10
Package: gnome-shell 3.26.2-0ubuntu0.1
ProcVersionSignature: Ubuntu 4.13.0-32.35-generic 4.13.13
Uname: Linux 4.13.0-32-generic x86_64
NonfreeKernelModules: wl
ApportVersion: 2.20.7-0ubuntu3.7
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Fri Feb 16 16:07:12 2018
DisplayManager: gdm3
GsettingsChanges:
 b'org.gnome.shell' b'enabled-extensions' b"['<email address hidden>', '<email address hidden>', '<email address hidden>', '<email address hidden>', '<email address hidden>', '<email address hidden>']"
 b'org.gnome.shell' b'enable-hot-corners' b'true'
 b'org.gnome.shell' b'favorite-apps' b"['googleinbox.desktop', 'googlecalendar.desktop', 'org.gnome.Nautilus.desktop', 'firefox.desktop']"
 b'org.gnome.desktop.interface' b'gtk-im-module' b"'gtk-im-context-simple'"
 b'org.gnome.desktop.interface' b'monospace-font-name' b"'Ubuntu Mono 11'"
InstallationDate: Installed on 2018-01-05 (42 days ago)
InstallationMedia: Ubuntu 17.04 "Zesty Zapus" - Release amd64 (20170412)
SourcePackage: gnome-shell
UpgradeStatus: Upgraded to artful on 2018-01-05 (42 days ago)

[Daniel van Vugt (vanvugt)]

So that we can understand what kind of graphical bug we are dealing with, please record a video of the problem (on a mobile phone is OK) and attach it here.

[Krister Swenson (thekswenson)]

A video showing the problem.

[Daniel van Vugt (vanvugt)]

Thanks.

Sounds like it might end up being the same problem as bug 1748871. Even though the appearance of the flicker seems different.

[Daniel van Vugt (vanvugt)]

Krister,

Other people are saying that kernel 4.15 has fixed the problem. Can you please try testing it by booting this?

  http://cdimages.ubuntu.com/daily-live/current/

[Krister Swenson (thekswenson)]

I booted this image and no longer experience the issue.

I'm not sure if the default for this image is Wayland or Xorg...
  the command "echo $DESKTOP_SESSION" gave "ubuntu".

The other thing is that I installed the packages linux-headers-4.15.0-10 and linux-image-4.15.0-10-generic on my 17.10 installation and still see have the flicker...
  so it's not the kernel that fixes the issue.

[Daniel van Vugt (vanvugt)]

Good point. The default session is Xorg now. And I can't seem to find a way to force Wayland using that iso.

[Daniel van Vugt (vanvugt)]

Did you check (with 'uname -r') that 4.15 was really the kernel you were testing in 17.10?

[Krister Swenson (thekswenson)]

Yes. I verified that using the kernel 4.15 does not fix the problem.

KMS

On Wed, Feb 28, 2018, 3:01 AM Daniel van Vugt <email address hidden>
wrote:

> Did you check (with 'uname -r') that 4.15 was really the kernel you were
> testing in 17.10?
>
> ** Changed in: gdm3 (Ubuntu)
> Status: New => Incomplete
>
> ** Changed in: mutter (Ubuntu)
> Status: New => Incomplete
>
> --
> You received this bug notification because you are subscribed to the bug
> report.
> https://bugs.launchpad.net/bugs/1749975
>
> Title:
> Flickering screen with ultra-wide monitor in Wayland mode
>
> Status in gdm3 package in Ubuntu:
> Incomplete
> Status in mutter package in Ubuntu:
> Incomplete
>
> Bug description:
> 1. leave computer until gnome-shell blanks the screen (monitor goes to
> sleep)
> 2. clear GDM screen by swiping up.
>
> There is a video flicker now when I interact with computer.
> Usually small, but can cover many different UI elements.
>
> This does not happen if I use the X backend instead of wayland.
>
> ProblemType: Bug
> DistroRelease: Ubuntu 17.10
> Package: gnome-shell 3.26.2-0ubuntu0.1
> ProcVersionSignature: Ubuntu 4.13.0-32.35-generic 4.13.13
> Uname: Linux 4.13.0-32-generic x86_64
> NonfreeKernelModules: wl
> ApportVersion: 2.20.7-0ubuntu3.7
> Architecture: amd64
> CurrentDesktop: ubuntu:GNOME
> Date: Fri Feb 16 16:07:12 2018
> DisplayManager: gdm3
> GsettingsChanges:
> b'org.gnome.shell' b'enabled-extensions' b"['
> <email address hidden>', '
> <email address hidden>', '<email address hidden>', '
> <email address hidden>', '
> <email address hidden>', '<email address hidden>']"
> b'org.gnome.shell' b'enable-hot-corners' b'true'
> b'org.gnome.shell' b'favorite-apps' b"['googleinbox.desktop',
> 'googlecalendar.desktop', 'org.gnome.Nautilus.desktop', 'firefox.desktop']"
> b'org.gnome.desktop.interface' b'gtk-im-module'
> b"'gtk-im-context-simple'"
> b'org.gnome.desktop.interface' b'monospace-font-name' b"'Ubuntu Mono
> 11'"
> InstallationDate: Installed on 2018-01-05 (42 days ago)
> InstallationMedia: Ubuntu 17.04 "Zesty Zapus" - Release amd64 (20170412)
> SourcePackage: gnome-shell
> UpgradeStatus: Upgraded to artful on 2018-01-05 (42 days ago)
>
> To manage notifications about this bug go to:
> https://bugs.launchpad.net/ubuntu/+source/gdm3/+bug/1749975/+subscriptions
>

[Krister Swenson (thekswenson)]

I do not experience this issue upon upgrade to 18.04.