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[Anonymous Linux User <1405489@xxxxxxxxxxxxxxxxxx>]

I have updated the BIOS.

(
  Asside: 
  For any other ZBook users note that the directions at https://help.ubuntu.com/community/BIOSUpdate are 
  incorrect as there is no README in the download from HP.  
  Instead,  on Boot press "ESC" to get into the BIOS setup and follow the instructions in the "BIOS Upgrade" section.  
) 

After having upgraded the BIOS I changed NVIDIA back to the "NVIDIA -
Power mode"

$ cat /proc/acpi/bbswitch 
0000:01:00.0 ON

And now can confirm that this issue still occurs.

Changing to confirmed as per instructions and posting updated BIOS data.

$ sudo dmidecode -s bios-version && sudo dmidecode -s bios-release-date
L70 Ver. 01.30
12/08/2014

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https://bugs.launchpad.net/bugs/1405489

Title:
   [HP ZBook 15 Mobile Workstation] Ubuntu 14.10 random freeze and lock
  up with NVIDIA

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  Ubuntu 14.10 has random freezes and lock ups.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.10
  Package: linux-image-3.16.0-28-generic 3.16.0-28.38
  ProcVersionSignature: Ubuntu 3.16.0-28.38-generic 3.16.7-ckt1
  Uname: Linux 3.16.0-28-generic x86_64
  ApportVersion: 2.14.7-0ubuntu8
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  afan       9511 F.... pulseaudio
   /dev/snd/controlC0:  afan       9511 F.... pulseaudio
  CurrentDesktop: KDE
  Date: Wed Dec 24 16:49:50 2014
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2014-12-23 (1 days ago)
  InstallationMedia: Kubuntu 14.10 "Utopic Unicorn" - Release amd64 (20141022.1)
  MachineType: Hewlett-Packard HP ZBook 15
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.16.0-28-generic root=UUID=31ffafeb-d84a-4173-81a4-99a3bde628f3 ro quiet splash rcutree.rcu_idle_gp_delay=1
  RelatedPackageVersions:
   linux-restricted-modules-3.16.0-28-generic N/A
   linux-backports-modules-3.16.0-28-generic  N/A
   linux-firmware                             1.138
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 08/13/2014
  dmi.bios.vendor: Hewlett-Packard
  dmi.bios.version: L70 Ver. 01.21
  dmi.board.name: 1909
  dmi.board.vendor: Hewlett-Packard
  dmi.board.version: KBC Version 94.53
  dmi.chassis.asset.tag: USH446L1YV
  dmi.chassis.type: 10
  dmi.chassis.vendor: Hewlett-Packard
  dmi.modalias: dmi:bvnHewlett-Packard:bvrL70Ver.01.21:bd08/13/2014:svnHewlett-Packard:pnHPZBook15:pvrA3009DD10203:rvnHewlett-Packard:rn1909:rvrKBCVersion94.53:cvnHewlett-Packard:ct10:cvr:
  dmi.product.name: HP ZBook 15
  dmi.product.version: A3009DD10203
  dmi.sys.vendor: Hewlett-Packard

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