Public bug reported: There's not much I can provide in terms of hard data, but maybe someone can help with getting to the bottom of this. After installing Ubuntu 18.10, I'm unable to use graphics-intensive games.
My setup: ASUS F556U, with Intel® Core™ i7-7500U CPU @ 2.70GHz × 4, Intel® HD Graphics 620 (Kaby Lake GT2) + NVIDIA GeForce 940MX. While the Nvidia card is being used (Performance mode set in nvidia- settings) and I run a 3d game with Steam (happens e.g. with Black Mesa, Euro Truck Simulator 2...), everything works as expected, but after a relatively short amount of time gnome-shell starts eating up more and more CPU for some reason, effectively taking over the actual game. The game starts to stutter first, then slowly grinds to a completely unresponsive state. If I manage to quit the game, gnome-shell still does its thing. I'm sometimes even unable to enter the overview mode in Gnome. The only solution is to reboot. This does happen with nvidia-driver-390 from the standard repo, but also with nvidia-driver-410 from the graphics PPA. This was not the issue with Ubuntu 18.04. It also does not happen with nouveau, or with the Intel drivers (power saving mode in nvidia-settings). There's also nothing of note in the syslog. ProblemType: Bug DistroRelease: Ubuntu 18.10 Package: gnome-shell 3.30.1-2ubuntu1 ProcVersionSignature: Ubuntu 4.18.0-12.13-generic 4.18.17 Uname: Linux 4.18.0-12-generic x86_64 ApportVersion: 2.20.10-0ubuntu13.1 Architecture: amd64 CurrentDesktop: ubuntu:GNOME Date: Thu Dec 6 07:26:04 2018 DisplayManager: gdm3 InstallationDate: Installed on 2018-12-05 (0 days ago) InstallationMedia: Ubuntu 18.10 "Cosmic Cuttlefish" - Release amd64 (20181017.3) ProcEnviron: PATH=(custom, no user) XDG_RUNTIME_DIR=<set> LANG=sk_SK.UTF-8 SHELL=/bin/bash SourcePackage: gnome-shell UpgradeStatus: No upgrade log present (probably fresh install) ** Affects: gnome-shell (Ubuntu) Importance: Undecided Status: New ** Tags: amd64 apport-bug cosmic -- You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is subscribed to gnome-shell in Ubuntu. https://bugs.launchpad.net/bugs/1807096 Title: gnome-shell uses 100% cpu, triggered by games while using nvidia- driver To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-shell/+bug/1807096/+subscriptions -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs