This bug was fixed in the package mutter - 42.9-0ubuntu7
---------------
mutter (42.9-0ubuntu7) jammy; urgency=medium
* Add build-Set-built-headers-as-libmutter_dep-sources.patch to prevent
occasional build failures depending on parallelism (LP: #2055530)
* Add cogl-gl-framebuffer-Fix-inverted-test-in-ensure_bits_init.patch to
fix test failures in mutter:cogl+cogl/conform / framebuffer-get-bits
when Mesa >= 23.1.1 (LP: #2055519)
mutter (42.9-0ubuntu6) jammy; urgency=medium
[ Kai-Heng Feng ]
* Fix mirror mode on reduced blanking panel. (LP: #2051074)
[ Daniel van Vugt ]
* Add compositor-x11-Sync-again-at-the-end-of-before_paint.patch
to fix incomplete redraws in X11 virtual machines (LP: #2054510)
* debian/control.in: Stop automatically reverting to the old uploaders.
-- Daniel van Vugt <daniel.van.v...@canonical.com> Fri, 01 Mar 2024
17:47:40 +0800
** Changed in: mutter (Ubuntu Jammy)
Status: Fix Committed => Fix Released
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https://bugs.launchpad.net/bugs/2054510
Title:
Incomplete screen redraws in virtual machines running Xorg
Status in Mutter:
Fix Released
Status in mutter package in Ubuntu:
Fix Committed
Status in mutter source package in Jammy:
Fix Released
Status in mutter source package in Mantic:
Fix Released
Status in mutter source package in Noble:
Fix Committed
Bug description:
[ Impact ]
When using software rendering on Xorg (so usually just in VMs), some
parts of app windows may fail to redraw.
https://gitlab.gnome.org/GNOME/mutter/-/issues/2880
[ Test Plan ]
1. Set up a virtual machine without graphics acceleration.
2. Log into 'Ubuntu on Xorg'.
3. Open Settings > About and verify Graphics = llvmpipe (or "Software
Rendering"), and Windowing System = X11.
4. sudo snap install chromium
5. Open Chromium and find a web page with lots of text. Plain text without
any links and staying at the top of the page will work best because you don't
want to trigger any scrolling.
6. Start selecting text with the mouse and while holding the button move the
mouse up and down rapidly. Avoid triggering any page scrolling.
7. Release the mouse button in roughly the middle of the area of text that
was selected.
8. Verify the remaining text selection is contiguous and not broken into
multiple disconnected text selections (the bug).
9. Repeat steps 7 and 8 several times to be sure.
[ Where problems could occur ]
The fix adds a new synchronization point between the compositor and X
server. This should be inconsequential, although there is a "sync
ring" in mutter used for this, and if a mistake occurs there then
other parts of the desktop could appear to stop responding in Xorg
sessions.
[ Other Info ]
This is a regression that started in 3.37.3 due to
https://gitlab.gnome.org/GNOME/mutter/-/commit/551101c65cda.
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