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[Bug 1580697] Missing required logs.


This bug is missing log files that will aid in diagnosing the problem.
>From a terminal window please run:

apport-collect 1580697

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

If, due to the nature of the issue you have encountered, you are unable
to run this command, please add a comment stating that fact and change
the bug status to 'Confirmed'.

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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  Kernel freezes after drm_wait_one_vblank timed out

Status in linux package in Ubuntu:

Bug description:
  Using kernel 4.4.0 from Ubuntu GNOME 16.04 I get a lot of warnings
  'drm_wait_one_vblank timed out' while booting and every time when I
  switch user or session via Alt-Fn. Example logs will be attached, I
  used this for saving the log:

  journalctl -b --system --no-pager |tee bootlog-$(uname
  -r)-$(lsb_release -sr)

  I suspect this may be related to some of my problems (slow switch,
  freeze, wrong VT: Alt-Fn6 roots to tty3) when switching virtual

  I see these messages on 16.04 or 14.04 when using kernel
  4.4.0-21-generic, 4.4.0-22-generic or mainline kernel
  4.4.0-040400-generic or 4.5.2-040502-generic, but mainline kernel
  4.3.6-040306-generic does not throw this message and there are no
  problems with 4.3.6 while switching VT.

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