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[Bug 1580697] Re: Kernel freezes after drm_wait_one_vblank timed out


** Package changed: ubuntu => linux (Ubuntu)

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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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