This bug was fixed in the package mutter - 46.2-1ubuntu0.24.04.6
---------------
mutter (46.2-1ubuntu0.24.04.6) noble; urgency=medium
[ Alessandro Astone ]
* Backport patch to avoid full framebuffer damage when dragging a window
(LP: #2080698)
* Backport patches to fix crash with pointer-constraints and touch
(LP: #2090824)
* Backport patches to fix touchscreen drag&drop (LP: #1966635)
* The above patches require and include the fix for LP: #2090824 even
though that bug does not exist on Noble.
* Silence lintian error about the version of two new symbols.
[ Yao Wei (魏銘廷) ]
* debian/patches: Synchronize touchscreen enabled state when adding it to
device mapper, which fixes suspend/resume related issue (LP: #2087831)
-- Daniel van Vugt <daniel.van.v...@canonical.com> Wed, 22 Jan 2025
14:14:03 +0800
** Changed in: mutter (Ubuntu Noble)
Status: Fix Committed => Fix Released
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https://bugs.launchpad.net/bugs/2080698
Title:
Dragging a window can cause full framebuffer damage
Status in Mutter:
Fix Released
Status in mutter package in Ubuntu:
Fix Released
Status in mutter source package in Noble:
Fix Released
Status in mutter source package in Oracular:
Fix Released
Bug description:
[ Impact ]
Window movements can cause a re-draw of the whole screen.
That causes an unnecessary performance hit, especially noticeable when using
a remote session.
Upstream bug: https://gitlab.gnome.org/GNOME/mutter/-/issues/3630
Upstream fix:
https://gitlab.gnome.org/GNOME/mutter/-/commit/030270ba3bf14b23a2d7a5371cf158ff2591f327
[ Test Plan ]
1. Set up an Ubuntu system and log in
2. Launch the Looking Glass debugger by pressing `Alt+F2`, typing `lg`, and
pressing Enter
3. Navigate to the "Flags" tab in the top right corner of the debug window
4. Scroll down and enable the `PAINT_DAMAGE_REGION` flag. By enabling this
flag, a red overlay will appear to show regions where the screen is being
redrawn and helps visualize framebuffer damage.
6. Drag a window across the screen
7. Verify that the red overlay only covers the window rectangle rather than
the whole screen
On the first drag the bug is expected to still be reproducible, but
all subsequent drags should not trigger the bug.
[ Where problems could occur ]
mutter is the Wayland compositor library that provides graphics and inputs
for the GNOME desktop, thus is a critical component.
Problems could manifest with the action of dragging a window not working
anymore, or sudden log-out if gnome-shell crashes.
To manage notifications about this bug go to:
https://bugs.launchpad.net/mutter/+bug/2080698/+subscriptions
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