During the last barely more than 24 hours, at least 4 people have reported/confirmed heavy latencies newly appearing in their GNOME Terminal. One person with Ubuntu 23.10 and two people with Ubuntu 22.04 (one of which comments has just been removed).
https://gitlab.gnome.org/GNOME/gnome-terminal/-/issues/8070 https://askubuntu.com/questions/1509058/input-delay-on-terminal- ubuntu-22-04-4 GNOME Terminal, and its underlying VTE terminal emulator widget, did not receive any updates recently in Ubuntu, so it's highly suspected that the bug sneaked in into some other component (or maybe a valid change in some other component triggered a yet undiscovered bug in VTE / GNOME Terminal). Even though I cannot reproduce the issue myself, I went through the log of my recent apt updates, and this mutter change is the only one seemingly relevant (see https://gitlab.gnome.org/GNOME/gnome- terminal/-/issues/8070#note_2067801 onwards); in fact, the summary showing a suspiciously high correlation with the new problem. At this point I don't have anything concrete, and it might just be a random coincidence, but I highly suspect that this recent mutter update introduces severe lagging in GNOME Terminal (and other terminal emulators using VTE's GTK3 version). ** Bug watch added: gitlab.gnome.org/GNOME/gnome-terminal/-/issues #8070 https://gitlab.gnome.org/GNOME/gnome-terminal/-/issues/8070 -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to mutter in Ubuntu. 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. To manage notifications about this bug go to: https://bugs.launchpad.net/mutter/+bug/2054510/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
