Can you please try downgrading to a supported version of the nvidia driver:
https://launchpad.net/ubuntu/+source/nvidia-graphics-drivers-390 and tell us if the problem still happens? ** Tags added: nvidia ** Changed in: gnome-shell (Ubuntu) Status: Confirmed => Incomplete ** 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/1805189 Title: gnome-shell high CPU usage (~100% CPU1) in idle with external monitor Status in gnome-shell package in Ubuntu: Incomplete Bug description: i7-8750H (6 cores, 12 threads) 32GB DDR GTX 1070 Max-Q 500GB SSD 4K external monitor (Dell U2718Q) No problem without the 4K monitor hooked up. When it is hooked up, CPU1 ~ 100% in idle. Gnome-shell and Xorg the problem. nvidia 410 from nvidia-ppa. ProblemType: Bug DistroRelease: Ubuntu 18.04 Package: gnome-shell 3.28.3-0ubuntu0.18.04.2 ProcVersionSignature: Ubuntu 4.15.0-39.42-generic 4.15.18 Uname: Linux 4.15.0-39-generic x86_64 NonfreeKernelModules: nvidia_modeset nvidia ApportVersion: 2.20.9-0ubuntu7.5 Architecture: amd64 CurrentDesktop: ubuntu:GNOME Date: Tue Nov 27 00:22:13 2018 DisplayManager: gdm3 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/1805189/+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
