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[Anonymous Linux User <1310762@xxxxxxxxxxxxxxxxxx>]

Also getting this with a zBook 15 and Ubuntu 14.10
Linux  3.16.0-28-generic #38-Ubuntu SMP Fri Dec 12 17:37:40 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux


$ lspci | grep -i vga
00:02.0 VGA compatible controller: Intel Corporation 4th Gen Core Processor Integrated Graphics Controller (rev 06)
01:00.0 VGA compatible controller: NVIDIA Corporation GK107GLM [Quadro K1100M] (rev ff)

$ dpkg --list | grep nvidia
ii  nvidia-331                                  331.113-0ubuntu0.1                       amd64        NVIDIA binary driver - version 331.113
ii  nvidia-331-uvm                              331.113-0ubuntu0.1                       amd64        NVIDIA Unified Memory kernel module
ii  nvidia-opencl-icd-331                       331.113-0ubuntu0.1                       amd64        NVIDIA OpenCL ICD
ii  nvidia-prime                                0.6.7                                    amd64        Tools to enable NVIDIA's Prime
ii  nvidia-settings                             331.20-0ubuntu8                          amd64        Tool for configuring the NVIDIA graphics driver

Ctrl-alt-F1 , ctrl-alt-f7 workaround unlocks things.

Tried changing /etc/default/grub to have

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash rcutree.rcu_idle_gp_delay=1"

but it did not change the lockup.

In kern.log get

 kernel: [ 6891.094246] ACPI Warning: \_SB_.PCI0.PEGP.DGFX._DSM:
Argument #4 type mismatch - Found [Buffer], ACPI requires [Package]
(20140424/nsarguments-95)


If I run "nvidia-settings" and change "PRIME profiles" from

NVIDIA (Performance Mode)
to
Intel (Power Saving Mode)

then it stops the lock up

May be related to https://bugs.debian.org/cgi-
bin/bugreport.cgi?bug=763272 as I noticed that

With PRIME profile as NVIDIA you get (the below number is from memory - but the ON I know was set ) 
$ cat /proc/acpi/bbswitch 
0000:01:00.0 ON


and it can't be changed as per bug https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=763272 

Also with PRIME profile as Intel you get
$ cat /proc/acpi/bbswitch 
0000:01:00.0 OFF


** Bug watch added: Debian Bug tracker #763272
   http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=763272

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https://bugs.launchpad.net/bugs/1310762

Title:
  [HP ZBook 15 Mobile Workstation] Ubuntu 14.04 random freeze and lock
  up

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  Just upgraded to 14.04 and started to experience random freezes. Only
  workaround in to ctrl+alt+tab+F2 and ctrl+alt+tab+f7 to unfreeze
  laptop. Or hard reset. Currently happens when browser is open (occures
  for firefox, chromium). Switching from nouveau to nvidia proprietary
  drivers (tried both stable and updated version) didn't help.

  WORKAROUND: Switched to Intel card and no lockups.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: xorg 1:7.7+1ubuntu8
  ProcVersionSignature: Ubuntu 3.13.0-24.46-generic 3.13.9
  Uname: Linux 3.13.0-24-generic x86_64
  NonfreeKernelModules: nvidia
  .proc.driver.nvidia.gpus.0: Error: [Errno 21] Is a directory: '/proc/driver/nvidia/gpus/0'
  .proc.driver.nvidia.registry: Binary: ""
  .proc.driver.nvidia.version:
   NVRM version: NVIDIA UNIX x86_64 Kernel Module  331.38  Wed Jan  8 19:32:30 PST 2014
   GCC version:  gcc version 4.8.2 (Ubuntu 4.8.2-19ubuntu1)
  .tmp.unity.support.test.0:

  ApportVersion: 2.14.1-0ubuntu3
  Architecture: amd64
  CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
  CompositorRunning: compiz
  CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0'
  CompositorUnredirectFSW: true
  CurrentDesktop: Unity
  Date: Mon Apr 21 22:32:25 2014
  DistUpgraded: 2014-04-21 17:22:37,996 DEBUG enabling apt cron job
  DistroCodename: trusty
  DistroVariant: ubuntu
  DkmsStatus:
   bbswitch, 0.7, 3.13.0-24-generic, x86_64: installed
   nvidia-331-updates, 331.38, 3.13.0-24-generic, x86_64: installed
  ExtraDebuggingInterest: Yes, if not too technical
  GraphicsCard:
   Intel Corporation 4th Gen Core Processor Integrated Graphics Controller [8086:0416] (rev 06) (prog-if 00 [VGA controller])
     Subsystem: Hewlett-Packard Company Device [103c:1909]
   NVIDIA Corporation GK107GLM [Quadro K1100M] [10de:0ff6] (rev a1) (prog-if 00 [VGA controller])
     Subsystem: Hewlett-Packard Company Device [103c:1909]
  InstallationDate: Installed on 2014-01-13 (98 days ago)
  InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016.1)
  MachineType: Hewlett-Packard HP ZBook 15
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-24-generic root=UUID=66d5c91d-34a5-4682-ad13-5523786548db ro quiet splash
  SourcePackage: xorg
  UpgradeStatus: Upgraded to trusty on 2014-04-21 (0 days ago)
  dmi.bios.date: 10/25/2013
  dmi.bios.vendor: Hewlett-Packard
  dmi.bios.version: L70 Ver. 01.06
  dmi.board.name: 1909
  dmi.board.vendor: Hewlett-Packard
  dmi.board.version: KBC Version 94.47
  dmi.chassis.type: 10
  dmi.chassis.vendor: Hewlett-Packard
  dmi.modalias: dmi:bvnHewlett-Packard:bvrL70Ver.01.06:bd10/25/2013:svnHewlett-Packard:pnHPZBook15:pvrA3009DD10303:rvnHewlett-Packard:rn1909:rvrKBCVersion94.47:cvnHewlett-Packard:ct10:cvr:
  dmi.product.name: HP ZBook 15
  dmi.product.version: A3009DD10303
  dmi.sys.vendor: Hewlett-Packard
  version.compiz: compiz 1:0.9.11+14.04.20140409-0ubuntu1
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.52-1
  version.libgl1-mesa-dri: libgl1-mesa-dri 10.1.0-4ubuntu5
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 10.1.0-4ubuntu5
  version.nvidia-graphics-drivers: nvidia-graphics-drivers N/A
  version.xserver-xorg-core: xserver-xorg-core 2:1.15.1-0ubuntu2
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.8.2-1ubuntu2
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.3.0-1ubuntu3
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.910-0ubuntu1
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau N/A
  xserver.bootTime: Mon Apr 21 21:41:25 2014
  xserver.configfile: /etc/X11/xorg.conf
  xserver.errors:

  xserver.logfile: /var/log/Xorg.0.log
  xserver.version: 2:1.15.1-0ubuntu2

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