confirmed also on lenovo thinkpad r61 with ubuntu 16.04.5 lts

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https://bugs.launchpad.net/bugs/1789258

Title:
  drm:drm_atomic_helper_wait_for_dependencies flip_done timed out

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  every now an then the system freezes but eventually comes back to
  life. the boot process is especially slow, login greeter takes ages to
  come up and then, while there, needs some extra time to unfreeze and
  actually allow typing in the password.

  the freeze can be easily reproduced each time when switching from
  graphics to console (with ctrl-alt-fN) and back. each time the dmesg
  gets also gets appended with the error messages that can be found in
  the attached text file.

  is the workaround really to uninstall intel's xorg drivers?

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: libdrm-intel1 2.4.91-2
  ProcVersionSignature: Ubuntu 4.15.0-33.36-generic 4.15.18
  Uname: Linux 4.15.0-33-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.2
  Architecture: amd64
  BootLog: Error: [Errno 13] Permission denied: '/var/log/boot.log'
  CompizPlugins: No value set for 
`/apps/compiz-1/general/screen0/options/active_plugins'
  CompositorRunning: None
  CurrentDesktop: XFCE
  Date: Mon Aug 27 20:03:14 2018
  DistUpgraded: Fresh install
  DistroCodename: bionic
  DistroVariant: ubuntu
  GraphicsCard:
   Intel Corporation Mobile GM965/GL960 Integrated Graphics Controller 
(primary) [8086:2a02] (rev 0c) (prog-if 00 [VGA controller])
     Subsystem: Lenovo Mobile GM965/GL960 Integrated Graphics Controller 
(primary) [17aa:383e]
     Subsystem: Lenovo Mobile GM965/GL960 Integrated Graphics Controller 
(secondary) [17aa:383e]
  InstallationDate: Installed on 2018-08-24 (3 days ago)
  InstallationMedia: Ubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 
(20180725)
  MachineType: LENOVO 0769BJG
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-33-generic 
root=UUID=5c1b96ff-002e-4358-bf56-8dd74e76584d ro dis_ucode_ldr
  SourcePackage: libdrm
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 06/11/2008
  dmi.bios.vendor: LENOVO
  dmi.bios.version: 68ET37WW
  dmi.board.name: IEL10
  dmi.board.vendor: LENOVO
  dmi.board.version: REFERENCE
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 10
  dmi.chassis.vendor: No Enclosure
  dmi.chassis.version: N/A
  dmi.modalias: 
dmi:bvnLENOVO:bvr68ET37WW:bd06/11/2008:svnLENOVO:pn0769BJG:pvr3000N200:rvnLENOVO:rnIEL10:rvrREFERENCE:cvnNoEnclosure:ct10:cvrN/A:
  dmi.product.family: Lenovo
  dmi.product.name: 0769BJG
  dmi.product.version: 3000 N200
  dmi.sys.vendor: LENOVO
  version.compiz: compiz N/A
  version.libdrm2: libdrm2 2.4.91-2
  version.libgl1-mesa-dri: libgl1-mesa-dri 18.0.5-0ubuntu0~18.04.1
  version.libgl1-mesa-glx: libgl1-mesa-glx 18.0.5-0ubuntu0~18.04.1
  version.xserver-xorg-core: xserver-xorg-core 2:1.19.6-1ubuntu4
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:18.0.1-1
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 
2:2.99.917+git20171229-1
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.15-2

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