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penalvch: We discovered in Bug #1175504, also relating to HP Compaq nx6325, you kindly suggested to Tobiasz "As a potential WORKAROUND, are you able to hibernate following https://help.ubuntu.com/community/PowerManagement/Hibernate ?"
Following your link we had success with hibernate using...
sudo -s
echo shutdown > /sys/power/disk
echo disk > /sys/power/state
although we had no joy encapsulating this into a script to be called from a desktop icon.

Also from http://ubuntuhandbook.org/index.php/2014/04/enable-hibernate-ubuntu-14-04/
sudo pm-hibernate
This has worked several times in succession and takes about 60 seconds to resume with zero battery drain whilst hibernated, so is ideal; better for us than suspend. Although the author goes on to give a method to 'Enable Hibernate in System Tray Menu' it was easier just to put the "sudo pm-hibernate" directly into a desktop launcher or script.

Regarding BIOS upgrade http://www.mwiacek.com/www/?q=node/103 says that the change from BIOS F06 to F07 was to 'provide support for AMD processors' and this Compaq nx6325 does contain a 'Mobile AMD Sempron(tm) Processor'.
The HP BIOS link you gave 
http://h20564.www2.hp.com/hpsc/swd/public/readIndex?sp4ts.oid=1849084&swLangOid=8&swEnvOid=2104 allows download of e.g. sp35894.exe that is a DOS/Windows executable! Maybe the method by Richlv http://h30434.www3.hp.com/t5/Notebook-Operating-Systems-and-Software/BIOS-upgrade-with-Linux/td-p/296487 will work.

As the laptop and Xubuntu is now working perfectly I would rather not upgrade the BIOS, with the inherent risk of upgrade, at this point although I realise it might help discover the problem with suspend.
We may attempt a BIOS upgrade some day when the laptop is not so depended on.

Having got hibernation working a few times I realise I only tried for
suspend as the hibernation option in Ubuntu 14.04 was missing. It is a
pity this cannot be re-enabled simply by clicking a setup box. Hopefully
in future upgrades the missing hibernate can be default enabled as
before.

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https://bugs.launchpad.net/bugs/1416348

Title:
  Suspend only works once, fails second time

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  Ubuntu 14.04 (trusty) Kernel 3.13.0-44-generic
  HP laptop Compaq nx6325
  A working suspend via Applications Menu/Log Out results in power switch green LED blinking on/off every few seconds.
  The laptop will do this the first time after a reboot but then every second attempt to suspend results in power switch green LED staying on.
  Screen goes black and no key sequences that respond can be found.
  The only option is to hold the power switch down for several seconds to do a hard reset.
  On restart it says...
  System program problem detected
  Report problem
  Clicked above several times, nothing happens, eventually pop up(s) go away.
  After this a dmesg doesn't seem to give clues - it does not contain the word suspend for instance.
  Following the reboot the laptop will now suspend correctly once, wake up ok but then fail to suspend when asked the second time.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.13.0-44-generic 3.13.0-44.73
  ProcVersionSignature: Ubuntu 3.13.0-44.73-generic 3.13.11-ckt12
  Uname: Linux 3.13.0-44-generic i686
  ApportVersion: 2.14.1-0ubuntu3.6
  Architecture: i386
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  andymc     1845 F.... pulseaudio
   /dev/snd/pcmC0D0p:   andymc     1845 F...m pulseaudio
  CRDA: Error: [Errno 2] No such file or directory: 'iw'
  CurrentDesktop: XFCE
  Date: Fri Jan 30 10:30:07 2015
  HibernationDevice: RESUME=UUID=de825ed2-1246-47c2-972c-2b7f1e2b28e0
  InstallationDate: Installed on 2013-04-08 (661 days ago)
  InstallationMedia: Peppermint 3 "Three" - Release i386 (20120423)
  MachineType: Hewlett-Packard HP Compaq nx6325 (RU594ES#ABU)
  PccardctlIdent:
   Socket 0:
     no product info available
  PccardctlStatus:
   Socket 0:
     no card
  ProcFB: 0 radeondrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-44-generic root=UUID=e7ea9b58-d3f1-4937-ab62-c05f1769367f ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-44-generic N/A
   linux-backports-modules-3.13.0-44-generic  N/A
   linux-firmware                             1.127.11
  RfKill:
   0: phy0: Wireless LAN
   	Soft blocked: no
   	Hard blocked: no
  SourcePackage: linux
  UpgradeStatus: Upgraded to trusty on 2014-08-22 (160 days ago)
  dmi.bios.date: 12/21/2006
  dmi.bios.vendor: Hewlett-Packard
  dmi.bios.version: 68TT2 Ver. F.06
  dmi.board.name: 30B0
  dmi.board.vendor: Hewlett-Packard
  dmi.board.version: KBC Version 40.15
  dmi.chassis.asset.tag: CNU7030G9D
  dmi.chassis.type: 10
  dmi.chassis.vendor: Hewlett-Packard
  dmi.modalias: dmi:bvnHewlett-Packard:bvr68TT2Ver.F.06:bd12/21/2006:svnHewlett-Packard:pnHPCompaqnx6325(RU594ES#ABU):pvrF.06:rvnHewlett-Packard:rn30B0:rvrKBCVersion40.15:cvnHewlett-Packard:ct10:cvr:
  dmi.product.name: HP Compaq nx6325 (RU594ES#ABU)
  dmi.product.version: F.06
  dmi.sys.vendor: Hewlett-Packard

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