I can confirm this bug with kernel 4.14.0-3-amd64 (debian-
ker...@lists.debian.org) (gcc version 7.2.0 (Debian 7.2.0-19)) #1 SMP
Debian 4.14.13-1 (2018-01-14).

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  i915 driver fails to resume display from suspend

Status in linux package in Ubuntu:

Bug description:
  Symptom is that the LCD on the laptop (Dell Latitude E7450) stays off
  after boot.  The laptop is running fine and can be reached via SSH,
  and rebooted.  I can also kill the Xorg server at which point my
  display manager starts a new session and restores the driver.

  I believe the display driver is failing to resume as indicated by this kernel 
log line:
  Feb  2 19:08:33 LON-IX-L-763 kernel: [32839.947460] [drm:intel_display_resume 
[i915]] *ERROR* Restoring old state failed with -22

  This looks like a regression in a recent kernel; this worked fine for
  ~1 year on Ubuntu 15.10 but I didn't test it on 16.04 so I can't
  confirm if it exists there.

  I suspend the machine by running pm-suspend, and it is resumed by the
  lid open event.

  I've attached the relevant time from /var/log/syslog which shows the
  kernel messages; this suspend was entered at 18:16:30 and woken up at

  ProblemType: Bug
  DistroRelease: Ubuntu 16.10
  Package: linux-image-extra-4.8.0-34-generic 4.8.0-34.36
  ProcVersionSignature: Ubuntu 4.8.0-34.36-generic 4.8.11
  Uname: Linux 4.8.0-34-generic x86_64
  ApportVersion: 2.20.3-0ubuntu8.2
  Architecture: amd64
   /dev/snd/pcmC1D0p:   pv         4009 F...m pulseaudio
   /dev/snd/controlC1:  pv         4009 F.... pulseaudio
   /dev/snd/controlC0:  pv         4009 F.... pulseaudio
   /dev/snd/seq:        pv         4126 F.... chrome
  Date: Fri Feb  3 03:23:55 2017
  EcryptfsInUse: Yes
  HibernationDevice: RESUME=UUID=adb71bac-b2c6-4c48-9f39-8b07f2b1d7b7
  InstallationDate: Installed on 2015-07-24 (559 days ago)
  InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422)
  MachineType: Dell Inc. Latitude E7450
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.8.0-34-generic 
root=UUID=3cd0b0b6-f38d-45bf-85aa-e6578b5e37c4 ro quiet splash vt.handoff=7
   linux-restricted-modules-4.8.0-34-generic N/A
   linux-backports-modules-4.8.0-34-generic  N/A
   linux-firmware                            1.161.1
  SourcePackage: linux
  UpgradeStatus: Upgraded to yakkety on 2016-12-19 (45 days ago)
  dmi.bios.date: 11/18/2015
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A09
  dmi.board.name: 0R1VJD
  dmi.board.vendor: Dell Inc.
  dmi.chassis.type: 9
  dmi.chassis.vendor: Dell Inc.
  dmi.product.name: Latitude E7450
  dmi.sys.vendor: Dell Inc.

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