Update mutter to 44.1

Bug #2020225 reported by Jeremy Bícha
This bug affects 1 person
Affects Status Importance Assigned to Milestone
mutter (Ubuntu)
Fix Released
Jeremy Bícha
Fix Released
Jeremy Bícha

Bug Description

There is a new bugfix release in the stable 44 series.

This is also a prerequisite to update gnome-shell to 44.1 (LP: #2020277)

Test Case
Complete the test case from


What Could Go Wrong
Mutter is an essential component of the default Ubuntu desktop and for the desktop used by Ubuntu Budgie.

A severe enough bug could mean that people are unable to use their desktop version of Ubuntu.

Smaller bugs could interrupt people's workflows.

mutter is part of GNOME Core and is included in the GNOME micro release exception


affects: ubuntu → mutter (Ubuntu)
Changed in mutter (Ubuntu):
status: Fix Committed → Fix Released
Changed in mutter (Ubuntu Lunar):
status: New → Triaged
importance: Undecided → Medium
assignee: nobody → Jeremy Bícha (jbicha)
Changed in mutter (Ubuntu Mantic):
assignee: nobody → Jeremy Bícha (jbicha)
Jeremy Bícha (jbicha)
Changed in mutter (Ubuntu Lunar):
status: Triaged → In Progress
Jeremy Bícha (jbicha)
description: updated
description: updated
no longer affects: mutter (Ubuntu Mantic)
Revision history for this message
Chris Halse Rogers (raof) wrote : Please test proposed package

Hello Jeremy, or anyone else affected,

Accepted mutter into lunar-proposed. The package will build now and be available at https://launchpad.net/ubuntu/+source/mutter/44.1-0ubuntu1 in a few hours, and then in the -proposed repository.

Please help us by testing this new package. See https://wiki.ubuntu.com/Testing/EnableProposed for documentation on how to enable and use -proposed. Your feedback will aid us getting this update out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug, mentioning the version of the package you tested, what testing has been performed on the package and change the tag from verification-needed-lunar to verification-done-lunar. If it does not fix the bug for you, please add a comment stating that, and change the tag to verification-failed-lunar. In either case, without details of your testing we will not be able to proceed.

Further information regarding the verification process can be found at https://wiki.ubuntu.com/QATeam/PerformingSRUVerification . Thank you in advance for helping!

N.B. The updated package will be released to -updates after the bug(s) fixed by this package have been verified and the package has been in -proposed for a minimum of 7 days.

Changed in mutter (Ubuntu Lunar):
status: In Progress → Fix Committed
tags: added: verification-needed verification-needed-lunar
Revision history for this message
Chris Halse Rogers (raof) wrote :

While the discussion about the test plan is ongoing https://discourse.ubuntu.com/t/scope-of-gnome-mru/18041/58 I'm happy to accept this with the currently documented test plan and the test plans on all the associated bugs.

Revision history for this message
Andreas Hasenack (ahasenack) wrote :

I installed mutter 44.1 and gnome-shell 44.1 from proposed, and a few of other related dependencies. I don't have everything at 44.1, I don't know if we should expect more gnome-related updates in lunar-proposed. For example, I have

gnome-shell-extension-prefs 44.1-0ubuntu1

but gnome-shell-extensions is at 44.0-1

Anyway, I wanted to report that I'm now seeing artifacts around window borders, when they are arranged to occupy all available area. I should note I'm also using gnome-shell-extension-ubuntu-tiling-assistant 39-3ubuntu2.

I'll attach some screenshots of what I'm seeing. Perhaps a video recording too, as the artifacts change depending on which window is selected.

Revision history for this message
Andreas Hasenack (ahasenack) wrote :

Turns out I'm only seeing it with google-chrome. Tried firefox, and a terminal, using the same reproducer, and it didn´t happen.

Revision history for this message
Andreas Hasenack (ahasenack) wrote :

The artifact at the border also happens across monitors. The tall chrome window on the right of the left monitor interferes with the windows aligned to the left of the right monitor.

This happened immediately after updating mutter and gnome shell to 44.1, it wasn't happening before.

Revision history for this message
Andreas Hasenack (ahasenack) wrote :

Also happens with chromium (the snap).

Revision history for this message
Andreas Hasenack (ahasenack) wrote :
Revision history for this message
fossfreedom (fossfreedom) wrote :

Confirmed that after install of libmutter-12-0 v44.1-0ubuntu1 from lunar-proposed on ubuntu budgie no additional regressions were noted. Tested standard stuff like window switching/max/min, tiling etc.

Independently team member Jacob has also confirmed that the same version does not additionally impacted his setup

Note - I tried to reproduce the artefact issue Andreas noted above with google chrome on ubuntu budgie + this new version but was unable to.

Revision history for this message
Jeremy Bícha (jbicha) wrote :

I installed mutter 44.1-0ubuntu1 on Ubuntu 23.04 and successfully completed the Test Case with the GNOME Classic, GNOME, Ubuntu, and Ubuntu on Xorg sessions.

We landed the gtk4 fix all the way to lunar-updates (and fully phased) that Andreas had mentioned earlier with the rectangle artifacts along the window borders so there is no regression there.

While I tested mutter 44.1 with and without the corresponding gnome-shell 44.1 update and did not see any issue having a newer mutter than gnome-shell, I recommend that both be landed together. gnome-shell 44.1 depends on mutter 44.1 but I did not add breaks to enforce the upgrade the opposite direction also. GNOME upstream assumes that mutter and gnome-shell are upgraded together.

tags: added: verification-done verification-done-lunar
removed: verification-needed verification-needed-lunar
Revision history for this message
Launchpad Janitor (janitor) wrote :

This bug was fixed in the package mutter - 44.1-0ubuntu1

mutter (44.1-0ubuntu1) lunar; urgency=medium

  [ Jeremy Bícha ]
  * New upstream release (LP: #2020225, LP: #2012717, LP: #2013216,
    LP: #2015861, LP: #2017097)
  * debian/libmutter-12-0.symbols: Add new symbols
  * Drop 3 patches applied in new release

  [ Daniel van Vugt ]
  * Update triple buffering patch for Mutter 44.1 (LP: #2017137)

 -- Jeremy Bícha <email address hidden> Fri, 19 May 2023 16:18:13 -0400

Changed in mutter (Ubuntu Lunar):
status: Fix Committed → Fix Released
Revision history for this message
Robie Basak (racb) wrote : Update Released

The verification of the Stable Release Update for mutter has completed successfully and the package is now being released to -updates. Subsequently, the Ubuntu Stable Release Updates Team is being unsubscribed and will not receive messages about this bug report. In the event that you encounter a regression using the package from -updates please report a new bug using ubuntu-bug and tag the bug report regression-update so we can easily find any regressions.

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