This is a freshly installed buster on an ibm t43 laptop. > when I switch back from tty1 (i3 X11 session) to tty7 > (LightDM + Arctica Greeter) directly (not via a text based tty), the > X.org processes dies immediately (or gets killed, I don't know) and > X.org restarts anew. The greeter appears, I can log in.
I see a similar behaviour. In my case the logged in session is killed when I switch to a lower tty (1-6) as well. Some non DEBUG messages from the logs: < /var/log/lightdm/lightdm.log CRITICAL: g_dbus_connection_call_sync_internal: assertion 'G_IS_DBUS_CONNECTION (connection)' failed 13:12 WARNING: Error getting user list from org.freedesktop.Accounts: GDBus.Error:org.freedesktop.DBus.Error.ServiceUnknown: The name org.freedesktop.Accounts was not provided by any .service files < /var/log/lightdm/seat0-greeter.log ** (lightdm-gtk-greeter:25072): WARNING **: [PIDs] Failed to execute command: upstart < /var/log/lightdm/x-0.log (EE) event1 - SynPS/2 Synaptics TouchPad: kernel bug: Touch jump detected and discarded. See https://wayland.freedesktop.org/libinput/doc/1.10.1/touchpad_jumping_cursor.html for details Xorg.log shows the (probably unrelated) touchpad bug and next to II messages only: (EE) AIGLX: reverting to software rendering This system will be available for testing to gathering additional info for some time. Feel free to send me pointers where to look.