FWIW a few other messages pop up to me in the above logs as suspicious
to the described symptoms, especially with keyboard working in
cryptsetup.

Mar 31 10:34:45 taplop org.gnome.Shell.desktop[5876]: libinput error: client 
bug: timer event25 debounce: offset negative (-111ms)
Mar 31 10:34:45 taplop org.gnome.Shell.desktop[5876]: libinput error: client 
bug: timer event25 debounce: offset negative (-44ms)
Mar 31 10:34:45 taplop org.gnome.Shell.desktop[5876]: libinput error: client 
bug: timer event25 debounce short: offset negative (-57ms)

When libinput initialized if it failed to configure those input devices,
that /might/ explain the behavior.  Flipping the hinge will cause them
to come on/off the bus and let libinput try again.

** Also affects: libinput (Ubuntu)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1822394

Title:
  [Dell BIOSes dated 27 Mar 2019] laptop keyboard & touchpad not working
  at gdm screen after boot

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