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While running an Ubuntu kernel (not a mainline or third-party kernel)
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apport-collect 1716258

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
Ubuntu Kernel Team.

** Changed in: linux (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1716258

Title:
  Keyboard input temporarily ignored when typing root encryption
  password

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  Symptoms:

  The computer begins its boot process, then the root decryption
  password prompt appears (via Plymouth) and I start typing. The first
  letters are caught, but some letters are not captured. It's as if the
  keyboard shut down during a few seconds and then returned, and I could
  type the whole password properly.

  Things I tried:

  - Typing the password blindly (just inputting the entire password and hitting 
Enter without worrying about missing characters) but it rejected the password 
as incorrect.
  - Typing decryption password without Plymouth (this is not a Plymouth bug).

  
  This affects Debian 9 (didn't affect Debian 8), Fedora, Arch Linux and 
possibly others. It cannot be reproduced with Ubuntu or other distributions 
with old packages. Some component introduced this problem recently.

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