Yes gnome-shell/mutter currently causes the GPU to stay in low power mode too much, unless you add extra demand.
This will be fixed in https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1441 or similar but it will take some months (or years) to complete. ** Changed in: gnome-shell (Ubuntu) Assignee: (unassigned) => Daniel van Vugt (vanvugt) ** Tags added: performance ** Changed in: gnome-shell (Ubuntu) Importance: Undecided => Medium ** Changed in: gnome-shell (Ubuntu) Status: New => In Progress -- 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/1937127 Title: Gnome-shell animations smoother when external monitor is connected Status in gnome-shell package in Ubuntu: In Progress Bug description: When no external monitor is connected Gnome Shell activities animation is sluggish. Once an external monitor is connected the animation becomes noticeably smoother. It looks like the OS is not properly responding to the extra processing demands by raising the CPU/GPU performance, and having an external monitor connected somehow triggers a higher performance level. This is on a System76 Darter Pro machine with Intel® Core™ i7-8565U and Intel UHD 620 running Ubuntu 21.04 in Wayland session. ProblemType: Bug DistroRelease: Ubuntu 21.04 Package: gnome-shell 3.38.4-1ubuntu3~21.04.1 ProcVersionSignature: Ubuntu 5.11.0-7620.21~1624379747~21.04~3abeff8~dev-generic 5.11.21 Uname: Linux 5.11.0-7620-generic x86_64 ApportVersion: 2.20.11-0ubuntu65.1 Architecture: amd64 CasperMD5CheckResult: pass CurrentDesktop: ubuntu:GNOME Date: Wed Jul 21 12:51:55 2021 DisplayManager: gdm3 InstallationDate: Installed on 2021-07-14 (7 days ago) InstallationMedia: Ubuntu 21.04 "Hirsute Hippo" - Release amd64 (20210420) RelatedPackageVersions: mutter-common 3.38.4-1ubuntu2 SourcePackage: gnome-shell UpgradeStatus: No upgrade log present (probably fresh install) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-shell/+bug/1937127/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp