Turning off TB4 tunneling in BIOS seems to avoid the problem.  No idea
what the downside might be - if any.

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  X1YG7 + Ubuntu 22.04.1 + TB4 Dock + LAN = HANG

Status in linux package in Ubuntu:

Bug description:
  (Copy of my Lenovo forum post)

  ThinkPad X1 Yoga Gen 7 (12th Gen Intel) BIOS and TB firmware fully
  updated.  ThinkPad Universal TB4 Dock firmware fully updated.  Ubuntu
  22.04.1 LTS _installed_ and fully updated.  LAN cable plugged into

  Ubuntu boots to login screen.  LAN LED on connected switch is ON and
  things seem OK.  When I log in LAN LED flashes and goes out.  Mouse
  and keyboard become unresponsive quickly.  I am sometimes able to try
  to launch FF or select shutdown but that's as far as it gets.  Nothing
  happens except eventually for the shutdown option the desktop
  wallpaper disappears and is replaced with a black screen and flashing
  cursor.  Forced power off via long button press is the only option.

  On reboot to Windows LAN LED is not on, and connection is not restored
  until I dis/reconnect the dock.  If I boot Ubuntu on the AC brick or
  on a Lenovo USB-C Mini Dock + LAN issue doesn't happen.  LAN works on
  mini dock.  If I boot with TB4 dock but no LAN cable, no issue. Wifi
  works.  My TP X1 Yoga Gen 6 with Ubuntu 21.04.1 LTS booted is fine on
  the TB4 dock + LAN.

  Attaching syslog.  I log in at ~ 17:41:25.  Logs include failed
  session and subsequent session on AC brick when I extracted the logs.

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