When starting Evolution /usr/lib/gdm3/gdm-x-session[2309]: (II) modeset information is printed to syslog
lsb_release -crid Distributor ID: Ubuntu Description: Ubuntu 18.04.1 LTS Release: 18.04 Codename: bionic
apt-cache policy gdm3 gdm3: Installed: 3.28.2-0ubuntu1.4 Candidate: 3.28.2-0ubuntu1.4
apt-cache policy evolution evolution: Installed: 3.28.1-2 Candidate: 3.28.1-2
apt-cache policy xserver-xorg xserver-xorg: Installed: 1:7.7+19ubuntu7.1 Candidate: 1:7.7+19ubuntu7.1
apt-cache policy xfe xfe: Installed: 1.42-1 Candidate: 1.42-1
This started the same day I did the upgrade from Ubuntu 16.04LTS to Ubuntu 18.04LTS. Package/system information above. I've attached the output that is sent to syslog each time Evo is started and sometimes when I start or stop XFE. I usually have running Evo, Firefox and at times XFE. I can duplicate the issue each time I start Evolution with XFE it appears to be intermittent.