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[Mikko Rantalainen <mikko.rantalainen@xxxxxxxx>]

Happening here, too, randomly after return from S3 (Ubuntu 16.04.3 LTS).

$ uname -a
Linux desktop 4.10.0-38-lowlatency #42~16.04.1-Ubuntu SMP PREEMPT Tue Oct 10 17:35:28 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux

Using integrated intel graphics on i5-3570K.

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https://bugs.launchpad.net/bugs/997483

Title:
  VT_WAITACTIVE does not work well with a multiseat setup

Status in Light Display Manager:
  In Progress
Status in lightdm package in Ubuntu:
  In Progress

Bug description:
  Related to the fix introduced in bug #851612 .

  Saw this in lightdm.log (system call interrupted because of ctrl-alt-del pressed):
  [+2.97s] DEBUG: New display ready, switching to it
  [+2.97s] DEBUG: Activating VT 8
  [+77.56s] WARNING: Error using VT_WAITACTIVE 8 on /dev/console: Interrupted system call
  [+77.56s] DEBUG: Got signal 15 from process 1
  [+77.56s] DEBUG: Caught Terminated signal, shutting down

  And in x-1-greeter.log:
  [+0.48s] DEBUG: Loading users from org.freedesktop.Accounts
  [+0.48s] DEBUG: Loading user /org/freedesktop/Accounts/User1001
  [+0.50s] DEBUG: Loading user /org/freedesktop/Accounts/User1000
  [+50.56s] WARNING: Error getting session list from org.freedesktop.DisplayManager: Timeout was reached

  On vt7, unity-greeter would get stuck after password input.
  On vt8, unity-greeter appears after that "getting session list timeout", which is about a minute later than vt7, and does not have a password input field.

  lightdm blocked by VT_WAITACTIVE may be the cause...

  Tested with lightdm 1.2.0-0ubuntu2 in precise.

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