Xorg sessions have higher output lag than Wayland sessions
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
Mutter |
Fix Released
|
Unknown
|
|||
mutter (Ubuntu) |
Fix Released
|
Medium
|
Daniel van Vugt |
Bug Description
Upstream bug: https:/
Upstream fix: https:/
---
Xorg sessions have higher output lag than Wayland sessions.
Test case:
Grab a window with the mouse and drag it around smoothly.
Expected: the same minimal gap between the cursor and the window's title bar in both Xorg and Wayland sessions.
Observed: a bigger gap (higher latency) in Xorg sessions.
I only realized this was a bug when I stumbled on a fix while experimenting with the presentation timing logic in mutter, so assigning to myself.
ProblemType: Bug
DistroRelease: Ubuntu 18.10
Package: mutter 3.30.0-4
ProcVersionSign
Uname: Linux 4.18.0-8-generic x86_64
ApportVersion: 2.20.10-0ubuntu11
Architecture: amd64
Date: Sun Oct 7 17:22:48 2018
InstallationDate: Installed on 2018-05-26 (133 days ago)
InstallationMedia: Ubuntu 18.10 "Cosmic Cuttlefish" - Alpha amd64 (20180525)
ProcEnviron:
TERM=xterm-
PATH=(custom, no user)
XDG_RUNTIME_
LANG=en_AU.UTF-8
SHELL=/bin/bash
SourcePackage: mutter
UpgradeStatus: No upgrade log present (probably fresh install)
Changed in mutter (Ubuntu): | |
status: | Triaged → In Progress |
Changed in mutter (Ubuntu): | |
milestone: | none → ubuntu-19.03 |
description: | updated |
affects: | fmutter → mutter |
Changed in mutter: | |
status: | Unknown → New |
Changed in mutter: | |
status: | New → Fix Released |
tags: |
added: bionic disco eoan removed: cosmic |
Upstream: https:/ /gitlab. gnome.org/ GNOME/mutter/ issues/ 334