** Description changed: + [ Impact ] + Mouse input latency in Wayland sessions is slightly higher in 23.10 than 22.04 at the moment. I might be imagining things and it does feel like only one frame higher latency. But experimenting with MUTTER_DEBUG_TRIPLE_BUFFERING seems to confirm my suspicion: - BAD: MUTTER_DEBUG_TRIPLE_BUFFERING=auto (the Ubuntu default) - BAD: MUTTER_DEBUG_TRIPLE_BUFFERING=always - GOOD: MUTTER_DEBUG_TRIPLE_BUFFERING=never + BAD: MUTTER_DEBUG_TRIPLE_BUFFERING=auto (the Ubuntu default) + BAD: MUTTER_DEBUG_TRIPLE_BUFFERING=always + GOOD: MUTTER_DEBUG_TRIPLE_BUFFERING=never - ProblemType: Bug - DistroRelease: Ubuntu 23.10 - Package: mutter 44.2-1ubuntu1 - ProcVersionSignature: Ubuntu 6.2.0-21.21-generic 6.2.6 - Uname: Linux 6.2.0-21-generic x86_64 - ApportVersion: 2.26.1-0ubuntu3 - Architecture: amd64 - CasperMD5CheckResult: pass - Date: Fri Jun 9 14:58:58 2023 - InstallationDate: Installed on 2023-05-23 (16 days ago) - InstallationMedia: Ubuntu 23.10 "Mantic Minotaur" - Daily amd64 (20230522) - SourcePackage: mutter - UpgradeStatus: No upgrade log present (probably fresh install) + [ Test Plan ] + + 0. Find a machine with an Intel GPU. + + 1. Add this to /etc/environment: CLUTTER_DEBUG=frame-timings + + 2. Reboot. + + 3. Log in to a Wayland session and wait for the desktop to become idle. + + 4. Also log in via ssh from a remote machine and run: + journalctl -f /usr/bin/gnome-shell + + 5. Over your idle desktop just wiggle the mouse continuously. + + 6. In your ssh login, verify that the resulting log messages from gnome- + shell say "[FRAME_TIMINGS]: Double buffering:" and not "[FRAME_TIMINGS]: + Triple buffering:" when only the mouse pointer is moving. + + [ Where problems could occur ] + + In the frame rate and latency of the Ubuntu desktop experience.
-- 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/2023363 Title: Mouse input latency in GNOME 44.1 Wayland sessions is one frame higher than it was in 44.0 and earlier Status in mutter package in Ubuntu: In Progress Bug description: [ Impact ] Mouse input latency in Wayland sessions is slightly higher in 23.10 than 22.04 at the moment. I might be imagining things and it does feel like only one frame higher latency. But experimenting with MUTTER_DEBUG_TRIPLE_BUFFERING seems to confirm my suspicion: BAD: MUTTER_DEBUG_TRIPLE_BUFFERING=auto (the Ubuntu default) BAD: MUTTER_DEBUG_TRIPLE_BUFFERING=always GOOD: MUTTER_DEBUG_TRIPLE_BUFFERING=never [ Test Plan ] 0. Find a machine with an Intel GPU. 1. Add this to /etc/environment: CLUTTER_DEBUG=frame-timings 2. Reboot. 3. Log in to a Wayland session and wait for the desktop to become idle. 4. Also log in via ssh from a remote machine and run: journalctl -f /usr/bin/gnome-shell 5. Over your idle desktop just wiggle the mouse continuously. 6. In your ssh login, verify that the resulting log messages from gnome-shell say "[FRAME_TIMINGS]: Double buffering:" and not "[FRAME_TIMINGS]: Triple buffering:" when only the mouse pointer is moving. [ Where problems could occur ] In the frame rate and latency of the Ubuntu desktop experience. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/mutter/+bug/2023363/+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
