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[oleg <1580697@xxxxxxxxxxxxxxxxxx>]

This looks like a duplicate of
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1542939

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https://bugs.launchpad.net/bugs/1580697

Title:
  Kernel freezes after drm_wait_one_vblank timed out

Status in linux package in Ubuntu:
  Confirmed

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
  terminal.

  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.
  --- 
  ApportVersion: 2.20.1-0ubuntu2
  Architecture: i386
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  k2         1475 F.... pulseaudio
  CurrentDesktop: GNOME
  DistroRelease: Ubuntu 16.04
  HibernationDevice: RESUME=UUID=8e0701ee-0c76-4396-bdd9-f406da205c7b
  InstallationDate: Installed on 2016-03-31 (41 days ago)
  InstallationMedia: Ubuntu-GNOME 16.04 LTS "Xenial Xerus" - Beta i386 (20160323.1)
  MachineType: FUJITSU SIEMENS LIFEBOOK E8310
  Package: linux (not installed)
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=de_DE.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-22-generic root=UUID=5811fae8-2bd0-46c0-a1b3-4bd8b9f2c821 ro
  ProcVersionSignature: Ubuntu 4.4.0-22.39-generic 4.4.8
  RelatedPackageVersions:
   linux-restricted-modules-4.4.0-22-generic N/A
   linux-backports-modules-4.4.0-22-generic  N/A
   linux-firmware                            1.157
  RfKill:
   0: phy0: Wireless LAN
   	Soft blocked: no
   	Hard blocked: no
  Tags:  xenial
  Uname: Linux 4.4.0-22-generic i686
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
  _MarkForUpload: True
  dmi.bios.date: 12/27/2007
  dmi.bios.vendor: FUJITSU // Phoenix Technologies Ltd.
  dmi.bios.version: Version 1.10
  dmi.board.name: FJNB1CE
  dmi.board.vendor: FUJITSU
  dmi.board.version: 1PCP331350-03
  dmi.chassis.type: 10
  dmi.chassis.vendor: FUJITSU SIEMENS
  dmi.chassis.version: E8310
  dmi.modalias: dmi:bvnFUJITSU//PhoenixTechnologiesLtd.:bvrVersion1.10:bd12/27/2007:svnFUJITSUSIEMENS:pnLIFEBOOKE8310:pvr:rvnFUJITSU:rnFJNB1CE:rvr1PCP331350-03:cvnFUJITSUSIEMENS:ct10:cvrE8310:
  dmi.product.name: LIFEBOOK E8310
  dmi.sys.vendor: FUJITSU SIEMENS

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