Found the problem in mutter: CLUTTER_FEATURE_SWAP_EVENTS is missing because COGL_WINSYS_FEATURE_SWAP_BUFFERS_EVENT is missing because cogl-winsys-glx isn't being used because xorg 2:1.20.4-1ubuntu1 is missing/has broken GLX support...
$ glxinfo name of display: :4 Error: couldn't find RGB GLX visual or fbconfig -- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to xorg-server in Ubuntu. https://bugs.launchpad.net/bugs/1818972 Title: [regression] gnome-shell visible latency is very high with Xorg 2:1.20.4-1ubuntu1 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/1818972/+subscriptions _______________________________________________ Mailing list: https://launchpad.net/~ubuntu-x-swat Post to : ubuntu-x-swat@lists.launchpad.net Unsubscribe : https://launchpad.net/~ubuntu-x-swat More help : https://help.launchpad.net/ListHelp
