Public bug reported:

I'm using Ubuntu 13.04  (Kernel : 3.8.0-23-generic #34-Ubuntu) on my HP
ElteBook 8470p. Ubuntu frequently freeze and I have to perform a hard
reboot by holding the button more than 5 seconds. Note that this never
happens when the charger is plugged, only while working on batteries. My
collegues have the same laptop with the same issue.

Description:    Ubuntu 13.04
Release:        13.04

ProblemType: Bug
DistroRelease: Ubuntu 13.04
Package: linux-image-3.8.0-23-generic 3.8.0-23.34
ProcVersionSignature: Ubuntu 3.8.0-23.34-generic 3.8.11
Uname: Linux 3.8.0-23-generic x86_64
NonfreeKernelModules: wl
ApportVersion: 2.9.2-0ubuntu8.1
Architecture: amd64
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC0:  philippe   1931 F.... pulseaudio
CurrentDmesg: [  349.223673] systemd-hostnamed[3141]: Warning: nss-myhostname 
is not installed. Changing the local hostname might make it unresolveable. 
Please install nss-myhostname!
Date: Thu Jun 27 07:52:19 2013
HibernationDevice: RESUME=UUID=1f624eb8-edf2-4d91-9c4c-75cec35b8551
InstallationDate: Installed on 2013-05-19 (38 days ago)
InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release amd64 (20130424)
MachineType: Hewlett-Packard HP EliteBook 8470p
MarkForUpload: True
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.8.0-23-generic 
root=UUID=1625e0c4-9e83-42da-ae93-a13b59a0c921 ro quiet splash vt.handoff=7
RelatedPackageVersions:
 linux-restricted-modules-3.8.0-23-generic N/A
 linux-backports-modules-3.8.0-23-generic  N/A
 linux-firmware                            1.106
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 08/03/2012
dmi.bios.vendor: Hewlett-Packard
dmi.bios.version: 68ICF Ver. F.06
dmi.board.name: 179B
dmi.board.vendor: Hewlett-Packard
dmi.board.version: KBC Version 42.1A
dmi.chassis.asset.tag: CZC2425XFD
dmi.chassis.type: 10
dmi.chassis.vendor: Hewlett-Packard
dmi.modalias: 
dmi:bvnHewlett-Packard:bvr68ICFVer.F.06:bd08/03/2012:svnHewlett-Packard:pnHPEliteBook8470p:pvrA1009D12:rvnHewlett-Packard:rn179B:rvrKBCVersion42.1A:cvnHewlett-Packard:ct10:cvr:
dmi.product.name: HP EliteBook 8470p
dmi.product.version: A1009D12
dmi.sys.vendor: Hewlett-Packard

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: Confirmed


** Tags: amd64 apport-bug raring

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https://bugs.launchpad.net/bugs/1195153

Title:
  HP EliteBook 8470p freeze

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