** Also affects: mutter (Ubuntu Mantic)
Importance: Medium
Assignee: Daniel van Vugt (vanvugt)
Status: In Progress
** Also affects: mutter (Ubuntu Lunar)
Importance: Undecided
Status: New
** Changed in: mutter (Ubuntu Lunar)
Assignee: (unassigned) => Daniel van Vugt (vanvugt)
** Changed in: mutter (Ubuntu Lunar)
Importance: Undecided => Medium
** Changed in: mutter (Ubuntu Lunar)
Status: New => Triaged
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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:
Triaged
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.
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.
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