** 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 [ 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 + journalctl -f /usr/bin/gnome-shell - 5. Over your idle desktop just wiggle the mouse continuously. + 5. Over your idle desktop just wiggle the mouse continuously for at + least 5 seconds. 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 Status in mutter source package in Lunar: In Progress Status in mutter source package in Mantic: 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 for at least 5 seconds. 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
