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[Tigran <1390807@xxxxxxxxxxxxxxxxxx>]

Unfortunately, I was quite busy and didn't actually report the problem to upstream kernel yet... But here is an update hoping this may help someone who experiences the same problem to save some time 

As I further noticed, freezes happend not only during resume but also
sometimes due to inactivity display lock, or sometimes when I was just
pressing the suspend menu item (before actually suspend happens). So I
assumed something else might be going on other than the resume. Since my
brightness didn't work either, my first focus went to it.

I noticed I have two independent modules that attempt to manage the brightness: intel_backlight and dell_backlight. I also noticed that echoing different values into /sys/class/backlight/dell_backlight had no effect, so I balcklisted dell_laptop module in /etc/modprobe.d/blacklist.conf, and after reboot can no longer reproduce my issue.
Hope this is it and I got to the source...

My understanding is dell_laptop module was conflicting and causing the
actual freeze.

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https://bugs.launchpad.net/bugs/1390807

Title:
  Dell 5737 freezes on ubuntu14 everytime during resume from suspend

Status in linux package in Ubuntu:
  Triaged

Bug description:
  My dell 5737 laptop was running all fine on 12.04. As soon as I
  upgraded to 14.04 I am consistenly running into system freeze
  everytime system attempts to resume from suspend. This happens when I
  simply close the lit of my laptop or due to screen inactivity
  suspend... When that happens only thing that works is hard reset. This
  is 100% reproducible.

  Interestingly, I noticed that on 3.11.10 kernel if I suspend manually
  from menu, the laptop resumes just fine.

  I tried pretty much all kernels upward including 12.04 ppa, even
  upgrading to 14.10 does not help. I am currently running
  3.16.0-24-generic kernel. I even upgraded my BIOS to A10 (even though
  it was clearly stated optional on Dell site).

  When I boot using 3.11.10 kernel all is well except my virtualbox no
  longer functions then.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.10
  Package: linux-image-3.16.0-24-generic 3.16.0-24.32
  ProcVersionSignature: Ubuntu 3.16.0-24.32-generic 3.16.4
  Uname: Linux 3.16.0-24-generic x86_64
  ApportVersion: 2.14.7-0ubuntu8
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  tigran     2677 F.... pulseaudio
   /dev/snd/controlC0:  tigran     2677 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Sat Nov  8 16:55:39 2014
  EcryptfsInUse: Yes
  HibernationDevice: RESUME=UUID=13e6d588-5ce1-44fb-ba8a-2c65b9cf8b3d
  InstallationDate: Installed on 2014-03-25 (228 days ago)
  InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016.1)
  MachineType: Dell Inc. Inspiron 5737
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.16.0-24-generic.efi.signed root=UUID=8a7c9255-ff8b-4a86-b586-07d8695f44cc ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.16.0-24-generic N/A
   linux-backports-modules-3.16.0-24-generic  N/A
   linux-firmware                             1.138
  SourcePackage: linux
  UpgradeStatus: Upgraded to utopic on 2014-10-28 (11 days ago)
  dmi.bios.date: 04/30/2014
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A08
  dmi.board.name: 04X8RP
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A00
  dmi.chassis.type: 8
  dmi.chassis.vendor: Dell Inc.
  dmi.chassis.version: A08
  dmi.modalias: dmi:bvnDellInc.:bvrA08:bd04/30/2014:svnDellInc.:pnInspiron5737:pvrA08:rvnDellInc.:rn04X8RP:rvrA00:cvnDellInc.:ct8:cvrA08:
  dmi.product.name: Inspiron 5737
  dmi.product.version: A08
  dmi.sys.vendor: Dell Inc.

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