Yes, there is a USB-C "port extender" (dock) attached to this Lenovo
laptop.  The model is the MUC-0501B.  It is this exact device :
https://amzn.to/3XA5u5N  -- "USB C Adapters for MacBook Pro/Air,Mac
Dongle with 3 USB Port,USB C to HDMI, USB C to RJ45 Ethernet,MOKiN 9 in
1 USB C to HDMI Adapter,100W Pd Charging, USB C to SD/TF Card Reader USB
C Hub".

I also have noticed occassional flickering.  What's interesting is that
either the display controlled via this, or via the direct HDMI port will
"drop out" for a second or 2 when the mouse moves between the screens.
If I move the mouse back to the alternate screen, the display comes
back.


** Attachment added: "video of a related(?) problem."
   
https://bugs.launchpad.net/linux/+bug/2003031/+attachment/5642054/+files/PXL_20230117_204102229.mp4

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https://bugs.launchpad.net/bugs/2003031

Title:
  gnome-shell crashes in the kernel at drm_atomic_check_only and the
  kernel says "adding CRTC not allowed without modesets: requested 0x4,
  affected 0x7"

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