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[jose <o1485726@xxxxxxxxx>]

I'm now using the linux-generic-lts-utopic package (version 3.16.0.34.27, from proposed) and can now confirm that the fix works. I had to remove the quirks, though.
@apw: thank you!

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https://bugs.launchpad.net/bugs/1313804

Title:
  [HP Pavilion dv6-6145eo Entertainment Notebook PC] Laptop display does
  not turn back on after resuming from suspend

Status in linux package in Ubuntu:
  Fix Released
Status in linux source package in Utopic:
  Fix Committed
Status in linux source package in Vivid:
  Fix Released

Bug description:
  On HP Pavilion dv6 the laptop display does not turn back on when resuming from suspend.
  External monitor wakes up just fine and the computer works normally except for the build in display which remains black. It should be noted that this is a dual graphics laptop  (lspci | grep VGA):
  00:01.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] BeaverCreek [Radeon HD 6520G]
  01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Whistler [Radeon HD 6630M/6650M/6750M/7670M/7690M] (rev ff)

  WORKAROUND: Suspending with "sudo pm-suspend --quirk-test
  --quirk-s3-bios" makes the computer resume normally with fully working
  display.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.13.0-24-generic 3.13.0-24.46 [modified: boot/vmlinuz-3.13.0-24-generic]
  ProcVersionSignature: Ubuntu 3.13.0-24.46-generic 3.13.9
  Uname: Linux 3.13.0-24-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  markus     1907 F.... pulseaudio
   /dev/snd/controlC0:  markus     1907 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Mon Apr 28 18:53:18 2014
  HibernationDevice: RESUME=UUID=ab1af41b-a639-463f-b406-431c8778f79d
  InstallationDate: Installed on 2014-04-27 (0 days ago)
  InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
  MachineType: Hewlett-Packard HP Pavilion dv6 Notebook PC
  ProcFB:
   0 radeondrmfb
   1 radeondrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-24-generic root=UUID=8b0f125d-261b-4d22-939f-546340147d79 ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-24-generic N/A
   linux-backports-modules-3.13.0-24-generic  N/A
   linux-firmware                             1.127
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 07/13/2011
  dmi.bios.vendor: Hewlett-Packard
  dmi.bios.version: F.20
  dmi.board.asset.tag: Base Board Asset Tag
  dmi.board.name: 358D
  dmi.board.vendor: Hewlett-Packard
  dmi.board.version: 33.18
  dmi.chassis.asset.tag: Chassis Asset Tag
  dmi.chassis.type: 10
  dmi.chassis.vendor: Hewlett-Packard
  dmi.chassis.version: Chassis Version
  dmi.modalias: dmi:bvnHewlett-Packard:bvrF.20:bd07/13/2011:svnHewlett-Packard:pnHPPaviliondv6NotebookPC:pvr058F110000244610000620100:rvnHewlett-Packard:rn358D:rvr33.18:cvnHewlett-Packard:ct10:cvrChassisVersion:
  dmi.product.name: HP Pavilion dv6 Notebook PC
  dmi.product.version: 058F110000244610000620100
  dmi.sys.vendor: Hewlett-Packard

  ===
  break-fix: - 66c2b84ba6256bc5399eed45582af9ebb3ba2c15

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