It looks like this could be a problem with the NVIDIA proprietary driver. Did this work correctly with previous versions of chromium and/or the driver?
Are there any crash files in /var/crash ? ** Changed in: chromium-browser (Ubuntu) Status: New => Incomplete -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to chromium-browser in Ubuntu. https://bugs.launchpad.net/bugs/1764202 Title: chromium-browser not drawing change when tab change after resume Status in chromium-browser package in Ubuntu: Incomplete Bug description: # reploduce chromium open multi tab. suspend and resume ubuntu. chromium tab change. # issue Drawing of the contents of the tab is not updated even when tab switching is done. (Even in this state, the Chromium Web page title display switches normally.) # workaround After waiting for a while after switching the tab, the tab switch will operate normally. ProblemType: Bug DistroRelease: Ubuntu 18.04 Package: chromium-browser 65.0.3325.181-0ubuntu1 ProcVersionSignature: Ubuntu 4.15.0-15.16-generic 4.15.15 Uname: Linux 4.15.0-15-generic x86_64 NonfreeKernelModules: nvidia_modeset nvidia ApportVersion: 2.20.9-0ubuntu4 Architecture: amd64 CurrentDesktop: ubuntu:GNOME Date: Mon Apr 16 09:14:10 2018 DetectedPlugins: InstallationDate: Installed on 2018-03-04 (42 days ago) InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Alpha amd64 (20180304) ProcEnviron: PATH=(custom, no user) XDG_RUNTIME_DIR=<set> LANG=ja_JP.UTF-8 SHELL=/bin/bash SourcePackage: chromium-browser UpgradeStatus: No upgrade log present (probably fresh install) modified.conffile..etc.default.chromium-browser: [deleted] To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/chromium-browser/+bug/1764202/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : firstname.lastname@example.org Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp