I can confirm this as well when using Ubuntu 17.10. I'm on a desktop (Shuttle XPC DH110SE) with Skylake processor and Intel graphics with latest updates.
Didn't have any problems on 17.04, don't have problems when using Gnome on logon. What I can add: I have no extension enabled - at least none of the ones displayed in Gnome Tweaks' "Extensions" tab. And it seemed to force log-off when a HDMI cable was plugged into my PC, but was not connected to a display. The actual connection to the display is done via DisplayPort. So the dead-end HDMI cable could cause trouble? -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to gnome-shell in Ubuntu. https://bugs.launchpad.net/bugs/1721428 Title: Artful (17.10) Session logout after screen turned off Status in GNOME Shell: Unknown Status in Nouveau Xorg driver: New Status in gnome-shell package in Ubuntu: Incomplete Status in mutter package in Ubuntu: Incomplete Bug description: Whenever I turn off my screen, the computer (a desktop PC) logs me out of my session. Here is a discussion thread with users of similar issue: https://ubuntuforums.org/showthread.php?t=2372388&p=13694312&posted=1#post13694312 To manage notifications about this bug go to: https://bugs.launchpad.net/gnome-shell/+bug/1721428/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
