Public bug reported:
Laptop: Lenovo ThinkPad L480
Graphics: Intel UHD Graphics 620 (KBL GT2)
Second monitor: Philips 276E8VJSB/00 4K UHD
There is a big performance degradation in an X11 session + 4K resolution
+ 125% fractional scaling in the second monitor compared to a Wayland
session. The mouse cursor moves very slow, dragging Windows is very
slow, scrolling in Firefox is very laggy, so everything becomes
unusable. The performance degradation applies in both displays even
though fractional scaling is only applied in the second 4K monitor.
Whereas in Wayland, the performance is much better in 4K resolution +
fractional scaling in the second monitor, the mouse cursor and dragging
windows are a lot smoother. I just sometimes notice a slight jump in the
mouse cursor but only in the second monitor, the built-in monitor
behaves normally.
ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: mutter 3.36.3-0ubuntu0.20.04.1
ProcVersionSignature: Ubuntu 5.4.0-42.46-generic 5.4.44
Uname: Linux 5.4.0-42-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.6
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
Date: Fri Aug 7 12:00:26 2020
InstallationDate: Installed on 2020-04-26 (102 days ago)
InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423)
ProcEnviron:
TERM=xterm-256color
PATH=(custom, no user)
XDG_RUNTIME_DIR=<set>
LANG=de_DE.UTF-8
SHELL=/bin/bash
SourcePackage: mutter
UpgradeStatus: No upgrade log present (probably fresh install)
** Affects: mutter (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug focal wayland-session
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https://bugs.launchpad.net/bugs/1890802
Title:
Big performance degradation in X11 + 4K resolution + fractional
scaling in second monitor compared to Wayland
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