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[Martin Schröder <1487993@xxxxxxxxxxxxxxxxxx>]

I tried to get more information by following
https://wiki.ubuntu.com/DebuggingKernelSuspend

The resume failure happens regardless of which suspend method I use:
shutting lid, click suspend in gui, pm-suspend

Regarding booting into the latest mainline kernel: Should I really use
the latest (v4.2-rc8-unstable) or the latest for my version of Ubuntu
(v3.15-rc2-trusty)?

I tried the "resume-trace" debugging procedure, but I'm not sure, it gave a usable result:
grep -i -A 3 -B 3 "hash matches" dmesg.txt 
[    1.308444] IMA: No TPM chip found, activating TPM-bypass!
[    1.308961] regulator-dummy: disabling
[    1.309142]   Magic number: 11:791:774
[    1.309197] mem zero: hash matches
[    1.309346] rtc_cmos 00:05: setting system clock to 2015-08-24 07:46:28 UTC (1440402388)
[    1.310770] BIOS EDD facility v0.16 2004-Jun-25, 0 devices found
[    1.310771] EDD information not available.

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https://bugs.launchpad.net/bugs/1487993

Title:
  [Dell Latitude E6410] Suspend/Resume failure

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  Since a short time, my Laptop does not resume correctly.
  What happens:
  - Fans and HD spin up
  - HD LED does not light up (it should blink if there is disk activity)
  - Screen stays black

  At the moment I can not say, after which kernel version this started to happen, I will try to find a version that works.
  Maybe this is a duplicate of #1054732

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.13.0-62-generic 3.13.0-62.102
  ProcVersionSignature: Ubuntu 3.13.0-62.102-generic 3.13.11-ckt24
  Uname: Linux 3.13.0-62-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.12
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  moi        2336 F.... pulseaudio
  CurrentDesktop: GNOME
  Date: Mon Aug 24 09:36:43 2015
  HibernationDevice: RESUME=UUID=a764be8f-548d-4ac1-a6c3-146c4f773eb9
  InstallationDate: Installed on 2014-05-17 (463 days ago)
  InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
  MachineType: Dell Inc. Latitude E6410
  PccardctlIdent:
   Socket 0:
     no product info available
  PccardctlStatus:
   Socket 0:
     no card
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-62-generic.efi.signed root=UUID=636cc6ef-7324-4465-89c8-020773a6fa84 ro quiet splash acpi_osi=Linux vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-62-generic N/A
   linux-backports-modules-3.13.0-62-generic  N/A
   linux-firmware                             1.127.15
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 12/05/2013
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A16
  dmi.board.name: 04373Y
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A03
  dmi.chassis.type: 9
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: dmi:bvnDellInc.:bvrA16:bd12/05/2013:svnDellInc.:pnLatitudeE6410:pvr0001:rvnDellInc.:rn04373Y:rvrA03:cvnDellInc.:ct9:cvr:
  dmi.product.name: Latitude E6410
  dmi.product.version: 0001
  dmi.sys.vendor: Dell Inc.

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