This just happened again, with the same HW config. When this happens, I have zombie processes (was testing ssh-agent) related to gnome-session, not sure if this will be the cause.
USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND sam 1590 0.0 0.0 0 0 ? Zs 14:00 0:00 [ssh-agent] <defunct> sam 14593 0.0 0.0 15044 968 tty3 S+ 19:06 0:00 grep --color=auto Z systemd(1)---gdm3(1076)---gdm-session-wor(1467)---gdm-x-session(1497 )---gnome-session-b(1510)---ssh-agent(1590) ** Attachment added: "dmesg.log" https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1785964/+attachment/5173014/+files/dmesg.log ** Changed in: linux (Ubuntu) Status: Incomplete => New ** Changed in: xorg-server (Ubuntu) Status: Incomplete => New -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1785964 Title: Unable to unlock the desktop session: systemd-logind: got pause for 13:69 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1785964/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs