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While running an Ubuntu kernel (not a mainline or third-party kernel)
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apport-collect 1871562

and then change the status of the bug to 'Confirmed'.

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This change has been made by an automated script, maintained by the
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** Changed in: linux (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1871562

Title:
  [ThinkPad P1 and ThinkPad X1 Extreme] System got hang during the first
  boot.

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  [Summary]
  System got hang during the first boot.

  [Steps to reproduce]
  1. Install Ubuntu 20.04 beta image on ThinkPad X1 Extreme or P1
  2. Unplug USB Live CD
  3. Boot system and verify the result

  [Expected result]
  System boots up smoothly

  [Actual result]
  System got hang during the first boot.

  [Failure rate]
  100%

  [Note]
  The ThinkPad P1 and ThinkPad X1 Extreme are I+N configs
  Even though system installed successfully in 'Safe mode', when user want to 
boot it up, system will got hang always.

  There is a workaround:
  1. Install Ubuntu 20.04 beta image on ThinkPad X1 Extreme or P1
  2. Unplug USB Live CD
  3. Boot system and enter grub
  4. Add the kernel parameter 'nomodeset' and press 'Ctrl+X'
  5. After log in successfully, install nvidia display driver
  6. After the driver installed, reboot system.

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