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I just wanted to report some findings with GDM and multiseat on Gnome 3.16
Mostly, I am only posting my findings in case it helps someone else because I have been running LightDM with multiseat for a while now. I was just curious how GDM is working with multiseat now.
With the standard configuration in /etc/gdm/custom.conf multiseat starts and works mostly normal. I do see a blurred background when logging into seat0. Seat1 logs in fine. Xorg is running twice (as root) and Xwayland is running once (as gdm). If I log out of seat1, the seat will not return to a login. The monitor stays on, but it is blank. I tried systemctl stop gdm and systemctl start gdm, but it will not bring back a logon to seat1.
If I go into etc/gdm/custom.conf and uncomment the line:
WaylandEnable=false
and reboot, then logon both seats, Xorg is running three times (as root). Logging out of the seats is normal.
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