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:
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
** (lightdm-gtk-greeter:25072): WARNING **: [PIDs] Failed to execute
(EE) event1 - SynPS/2 Synaptics TouchPad: kernel bug: Touch jump
detected and discarded. See
Xorg.log shows the (probably unrelated) touchpad bug and next to II
(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.