<div style="font-family: Menlo, Consolas, Courier New, Monospace; font-size: 14px;"><span>--- Rollback test using <a target="_blank" rel="noreferrer nofollow noopener" href="http://snapshot.debian.org">snapshot.debian.org</a> ---</span><div><br></div><div><span>1. Checked upgrade history to find exact date and versions:</span></div><div><br></div><div><span> $ zgrep -h "mutter\|gnome-shell" /var/log/dpkg.log* | grep " upgrade "</span></div><div><br></div><div><span> Result:</span></div><div><span> 2026-01-10 19:13:24 upgrade mutter-common:all 48.4-2 48.7-0+deb13u1</span></div><div><span> 2026-01-10 19:13:25 upgrade gir1.2-mutter-16:amd64 48.4-2 48.7-0+deb13u1</span></div><div><span> 2026-01-10 19:13:25 upgrade libmutter-16-0:amd64 48.4-2 48.7-0+deb13u1</span></div><div><span> 2026-01-10 19:13:25 upgrade mutter-common-bin:amd64 48.4-2 48.7-0+deb13u1</span></div><div><span> 2026-01-10 19:13:25 upgrade gnome-shell-extension-prefs:amd64 48.4-1~deb13u1 48.7-0+deb13u1</span></div><div><span> 2026-01-10 19:13:25 upgrade gnome-shell:amd64 48.4-1~deb13u1 48.7-0+deb13u1</span></div><div><span> 2026-01-10 19:13:25 upgrade gnome-shell-common:all 48.4-1~deb13u1 48.7-0+deb13u1</span></div><div><br></div><div><span>2. Added Debian snapshot repository (day before upgrade):</span></div><div><br></div><div><span> $ echo 'deb [check-valid-until=no] <a target="_blank" rel="noreferrer nofollow noopener" href="https://snapshot.debian.org/archive/debian/20260109T000000Z/">https://snapshot.debian.org/archive/debian/20260109T000000Z/</a> trixie main' | sudo tee /etc/apt/sources.list.d/snapshot.list</span></div><div><span> $ sudo apt update</span></div><div><br></div><div><span>3. Downgraded all affected packages:</span></div><div><br></div><div><span> $ sudo apt install \</span></div><div><span> mutter-common=48.4-2 \</span></div><div><span> libmutter-16-0=48.4-2 \</span></div><div><span> gir1.2-mutter-16=48.4-2 \</span></div><div><span> mutter-common-bin=48.4-2 \</span></div><div><span> gnome-shell=48.4-1~deb13u1 \</span></div><div><span> gnome-shell-common=48.4-1~deb13u1 \</span></div><div><span> gnome-shell-extension-prefs=48.4-1~deb13u1</span></div><div><br></div><div><span>4. Held packages to prevent re-upgrade:</span></div><div><br></div><div><span> $ 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</span></div><div><br></div><div><span>5. Removed snapshot repository and rebooted:</span></div><div><br></div><div><span> $ sudo rm /etc/apt/sources.list.d/snapshot.list</span></div><div><span> $ sudo apt update</span></div><div><span> $ sudo reboot</span></div><div><br></div><div><span>--- Result ---</span></div><div><br></div><div><span>After downgrade to version 48.4, the smooth transition animation from GDM to </span></div><div><span>GNOME Shell works correctly again. This confirms the regression was introduced </span></div><span>in version 48.7-0+deb13u1.</span><br></div><div style="font-family: Menlo, Consolas, Courier New, Monospace; font-size: 14px;" class="protonmail_signature_block "><div class="protonmail_signature_block-user "><div><span style="scrollbar-width: thin; scrollbar-color: rgba(0, 0, 0, 0.35) rgba(0, 0, 0, 0); font-family: Arial, sans-serif; background-color: rgb(255, 255, 255);"><b style="scrollbar-width:thin;scrollbar-color:rgba(0, 0, 0, 0.35) rgba(0, 0, 0, 0)"><span><br></span></b></span></div><span style="scrollbar-width: thin; scrollbar-color: rgba(0, 0, 0, 0.35) rgba(0, 0, 0, 0); font-family: Menlo, Consolas, "Courier New", monospace; background-color: rgb(255, 255, 255);"><b style="scrollbar-width:thin;scrollbar-color:rgba(0, 0, 0, 0.35) rgba(0, 0, 0, 0)">Antonio José Masiá</b></span><br><span style="scrollbar-width: thin; scrollbar-color: rgba(0, 0, 0, 0.35) rgba(0, 0, 0, 0); font-family: Menlo, Consolas, "Courier New", monospace; background-color: rgb(255, 255, 255);">Software Engineer</span><div><a href="mailto:ajmasia.dev@ysnp.link" title="ajmasia.dev@ysnp.link" style="font-family: Arial, sans-serif; font-size: 0.875rem; scrollbar-color: rgba(0, 0, 0, 0.35) rgba(0, 0, 0, 0);"><span style="font-family: Menlo, Consolas, "Courier New", monospace;">ajmasia.dev@ysnp.link</span></a></div><div><span><a target="_blank" rel="noreferrer nofollow noopener" href="https://betapermanente.link/"><span style="font-family: Menlo, Consolas, "Courier New", monospace;">https://betapermanente.link</span></a></span></div><div style="font-family: Arial, sans-serif; font-size: 14px; color: rgb(0, 0, 0); background-color: rgb(255, 255, 255);"><br></div><div style="font-family: Arial, sans-serif; font-size: 14px; color: rgb(0, 0, 0); background-color: rgb(255, 255, 255);"><span style="font-family: Menlo, Consolas, "Courier New", monospace;">---</span><div><span style="font-family: Menlo, Consolas, "Courier New", monospace;"><b>Aviso de privacidad</b>. 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