If this is still happening then it might be explained by the Mutter
frame clock over-scheduling frames such that 4 are in flight instead of
the usual limit of 3 for triple buffering. If that's the case then it
should be easy to just increase the limit, but I should note only Nvidia
on Xorg is affected. So for most people that just means Ubuntu 22.04 or
24.04. Future Ubuntu releases won't default to Xorg and likely won't
even have it as an option.
** Changed in: mutter (Ubuntu)
Assignee: (unassigned) => Daniel van Vugt (vanvugt)
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https://bugs.launchpad.net/bugs/2093112
Title:
[nvidia 550 + X11] gnome terminal input lag and stutter
("MetaSyncRing: We should never wait for a sync -- add more syncs?")
Status in mutter package in Ubuntu:
Confirmed
Status in nvidia-graphics-drivers-535 package in Ubuntu:
Invalid
Status in nvidia-graphics-drivers-550 package in Ubuntu:
Confirmed
Bug description:
What happens:
- The cursor in gnome-terminal lags behind typed input, sometimes
stuttering back and forth so characters appear, disappear, and then
appear again a fraction of a second later. It's as if the frame buffer
is occasionally replaying the last few frames.
This appears to be a close relative of
https://bugs.launchpad.net/ubuntu/+source/mutter/+bug/2059847
because this is _exactly_ how I experienced that bug, and this
behavior disappeared once the fix was released but now it has
returned.
I'm unclear if this bug is a problem with mutter, the nvidia driver,
or some interaction between the two but they would on first glance
seem the obvious culprits given the similarity this displays to
#2059847
Release is Ubuntu 22.04.5
Kernel version 6.8.0-50-generic
potentially related packages versions
nvidia-driver-550 550.120-0ubuntu0.22.04.1
mutter-common 42.9-0ubuntu9
gnome-terminal 3.44.0-1ubuntu1
Please let me know what additional info would be useful and I'll
attempt to provide.
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/mutter/+bug/2093112/+subscriptions
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