I can't yet tell which issue this is, but it sounds likely to be one of https://discourse.ubuntu.com/t/x11-hidpi-scaling-available-for-testing-on-disco/10293/3
If you need a fractional scale value then you should find the implementation for Wayland sessions performs better and is more complete. Because it doesn't have to deal with legacy Xorg. If you need Xorg then using whole scale values (n * 100%) works better as you mentioned, because it avoids the Xorg fractional scaling path. ** Tags added: performance -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to gnome-shell in Ubuntu. https://bugs.launchpad.net/bugs/1846398 Title: Fractional scaling has significant visible refreshes on a 4k display Status in gnome-shell package in Ubuntu: New Status in mutter package in Ubuntu: New Bug description: On my laptop, fractional scaling seems fine, including watching a YouTube video. It has a quad HD display. Enabling fractional scaling on my desktop which is attached to a single 4k display, fractional scaling isn't usable. The video appears to be constantly refreshing and not using the same acceleration as if I just run at 100% or 200%. ProblemType: Bug DistroRelease: Ubuntu 19.10 Package: gnome-shell 3.34.0-1ubuntu1 ProcVersionSignature: Ubuntu 5.3.0-13.14-generic 5.3.0 Uname: Linux 5.3.0-13-generic x86_64 NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair ApportVersion: 2.20.11-0ubuntu7 Architecture: amd64 CurrentDesktop: ubuntu:GNOME Date: Wed Oct 2 14:23:33 2019 DisplayManager: gdm3 InstallationDate: Installed on 2018-07-24 (435 days ago) InstallationMedia: Ubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 (20180724) ProcEnviron: TERM=xterm PATH=(custom, no user) XDG_RUNTIME_DIR=<set> LANG=en_US.UTF-8 SHELL=/bin/bash RelatedPackageVersions: mutter-common 3.34.0-3ubuntu1 SourcePackage: gnome-shell UpgradeStatus: Upgraded to eoan on 2019-07-19 (74 days ago) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-shell/+bug/1846398/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : [email protected] Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
