Hi,
Did an upstream bug get filed for this? I have the same pc model (HP Compaq 
dc7800p) and have always seen the same odd behaviour where the pc must first be 
put into hibernate before it will be able to resume from suspend to RAM. I have 
seen this behaviour in both Ubuntu and Arch linux (every version I have tried 
going back several years).

I currently don't use Ubuntu on this pc and came across this report
looking for something else (updating kernel from 3.16.2 to 3.17.3 on
Arch also broke my ability to hibernate so I couldn't access suspend of
any kind without downgrading again). But I thought an additional
confirmation of this bug (and as an upstream issue) could be helpful.

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https://bugs.launchpad.net/bugs/1375995

Title:
  [HP Compaq dc7800 Small Form Factor PC] suspend/resume failure

Status in “linux” package in Ubuntu:
  Triaged

Bug description:
  Suspend to RAM fails on HP Compaq dc7800p, the PC will not wake up
  again. It only works if I suspend to disk before, then I can suspend
  to RAM afterwards (as many time as needed) until the PC is rebooted
  again.

  ProblemType: KernelOops
  DistroRelease: Ubuntu 14.10
  Package: linux-image-3.16.0-18-generic 3.16.0-18.25
  ProcVersionSignature: Ubuntu 3.16.0-18.25-generic 3.16.3
  Uname: Linux 3.16.0-18-generic x86_64
  Annotation: This occured during a previous suspend and prevented it from 
resuming properly.
  ApportVersion: 2.14.7-0ubuntu2
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  urs        1849 F.... lxpanel
  CRDA: Error: [Errno 2] No such file or directory: 'iw'
  Date: Tue Sep 30 20:44:46 2014
  DuplicateSignature: suspend/resume:Hewlett-Packard HP Compaq dc7800p Small 
Form Factor:786F1 v01.32
  ExecutablePath: /usr/share/apport/apportcheckresume
  Failure: suspend/resume
  HibernationDevice: RESUME=UUID=c338e9df-bc69-4692-b108-88cfd64982a7
  InstallationDate: Installed on 2014-09-28 (2 days ago)
  InstallationMedia: Lubuntu 14.10 "Utopic Unicorn" - Alpha amd64 (20140923)
  InterpreterPath: /usr/bin/python3.4
  IwConfig:
   eth0      no wireless extensions.
   
   lo        no wireless extensions.
  MachineType: Hewlett-Packard HP Compaq dc7800p Small Form Factor
  ProcCmdline: /usr/bin/python3 /usr/share/apport/apportcheckresume
  ProcEnviron:
   TERM=linux
   PATH=(custom, no user)
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.16.0-18-generic 
root=UUID=6475de33-f0cf-4e4a-b155-bac5d4c61b27 ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.16.0-18-generic N/A
   linux-backports-modules-3.16.0-18-generic  N/A
   linux-firmware                             1.134
  RfKill:
   
  SourcePackage: linux
  Title: [Hewlett-Packard HP Compaq dc7800p Small Form Factor] suspend/resume 
failure
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups:
   
  dmi.bios.date: 07/21/2011
  dmi.bios.vendor: Hewlett-Packard
  dmi.bios.version: 786F1 v01.32
  dmi.board.asset.tag: CZC81885DS
  dmi.board.name: 0AA8h
  dmi.board.vendor: Hewlett-Packard
  dmi.chassis.asset.tag: CZC81885DS
  dmi.chassis.type: 4
  dmi.chassis.vendor: Hewlett-Packard
  dmi.modalias: 
dmi:bvnHewlett-Packard:bvr786F1v01.32:bd07/21/2011:svnHewlett-Packard:pnHPCompaqdc7800pSmallFormFactor:pvr:rvnHewlett-Packard:rn0AA8h:rvr:cvnHewlett-Packard:ct4:cvr:
  dmi.product.name: HP Compaq dc7800p Small Form Factor
  dmi.sys.vendor: Hewlett-Packard

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