Bug#1125273: Confirmed regression - rollback to 48.4 restores smooth transition

[Antonio José Masiá]

--- Rollback test using snapshot.debian.org ---

1. Checked upgrade history to find exact date and versions:

$ zgrep -h "mutter\|gnome-shell" /var/log/dpkg.log* | grep " upgrade "

Result:
2026-01-10 19:13:24 upgrade mutter-common:all 48.4-2 48.7-0+deb13u1
2026-01-10 19:13:25 upgrade gir1.2-mutter-16:amd64 48.4-2 48.7-0+deb13u1
2026-01-10 19:13:25 upgrade libmutter-16-0:amd64 48.4-2 48.7-0+deb13u1
2026-01-10 19:13:25 upgrade mutter-common-bin:amd64 48.4-2 48.7-0+deb13u1
2026-01-10 19:13:25 upgrade gnome-shell-extension-prefs:amd64 48.4-1~deb13u1 48.7-0+deb13u1
2026-01-10 19:13:25 upgrade gnome-shell:amd64 48.4-1~deb13u1 48.7-0+deb13u1
2026-01-10 19:13:25 upgrade gnome-shell-common:all 48.4-1~deb13u1 48.7-0+deb13u1

2. Added Debian snapshot repository (day before upgrade):

$ echo 'deb [check-valid-until=no] https://snapshot.debian.org/archive/debian/20260109T000000Z/ trixie main' | sudo tee /etc/apt/sources.list.d/snapshot.list
$ sudo apt update

3. Downgraded all affected packages:

$ sudo apt install \
mutter-common=48.4-2 \
libmutter-16-0=48.4-2 \
gir1.2-mutter-16=48.4-2 \
mutter-common-bin=48.4-2 \
gnome-shell=48.4-1~deb13u1 \
gnome-shell-common=48.4-1~deb13u1 \
gnome-shell-extension-prefs=48.4-1~deb13u1

4. Held packages to prevent re-upgrade:

$ sudo apt-mark hold mutter-common libmutter-16-0 gir1.2-mutter-16 mutter-common-bin gnome-shell gnome-shell-common gnome-shell-extension-prefs

5. Removed snapshot repository and rebooted:

$ sudo rm /etc/apt/sources.list.d/snapshot.list
$ sudo apt update
$ sudo reboot

--- Result ---

After downgrade to version 48.4, the smooth transition animation from GDM to
GNOME Shell works correctly again. This confirms the regression was introduced in version 48.7-0+deb13u1.

Antonio José Masiá
Software Engineer
ajmasia.dev at ysnp.link
[https://betapermanente.link](https://betapermanente.link/)

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