Public bug reported:

Since installing Oneiric on this system I've found it is impossible to
shutdown cleanly. There are two, possibly unrelated, symptoms:

1.) Selecting shutdown from the session management menu only logs me out to 
lightdm. Selecting shutdown from the session management menu in lightdm does 
nothing.
2.) Running 'shutdown now' from a terminal actually does seem to shut the 
system down at first, but after a while it starts flashing alternate colour 
screens (red, blue, green, white, grey etc, etc)

The only way to turn the system off is to do a hard shutdown via the
power button.

ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: linux-image-3.0.0-14-generic-pae 3.0.0-14.23
ProcVersionSignature: Ubuntu 3.0.0-14.23-generic-pae 3.0.9
Uname: Linux 3.0.0-14-generic-pae i686
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
ApportVersion: 1.23-0ubuntu4
Architecture: i386
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC0:  brendand   2057 F.... pulseaudio
 /dev/snd/controlC1:  brendand   2057 F.... pulseaudio
CRDA: Error: [Errno 2] No such file or directory
Card0.Amixer.info:
 Card hw:0 'Intel'/'HDA Intel at 0xd8420000 irq 48'
   Mixer name   : 'Analog Devices AD1984A'
   Components   : 'HDA:11d4194a,103c30dc,00100400 
HDA:11c11040,103c1378,00100200'
   Controls      : 18
   Simple ctrls  : 11
Card1.Amixer.info:
 Card hw:1 'Device'/'C-Media USB Audio Device at usb-0000:00:1a.7-4.1, full 
speed'
   Mixer name   : 'USB Mixer'
   Components   : 'USB0d8c:0008'
   Controls      : 5
   Simple ctrls  : 3
Date: Thu Dec 15 08:45:34 2011
HibernationDevice: RESUME=UUID=17696c8f-e3c6-4b65-b0b6-9ef90186a071
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release i386 (20111012)
MachineType: Hewlett-Packard HP EliteBook 6930p
PccardctlIdent:
 Socket 0:
   product info: "RICOH", "Bay8Controller", "", ""
   manfid: 0x0000, 0x0000
   function: 254 (unknown)
PccardctlStatus:
 Socket 0:
   3.3V 16-bit PC Card
   Subdevice 0 (function 0) bound to driver "pata_pcmcia"
ProcEnviron:
 LANGUAGE=en_GB:en
 PATH=(custom, no user)
 LANG=en_GB.UTF-8
 SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.0.0-14-generic-pae 
root=UUID=00844859-f08b-41a6-95c7-92342bd6775a ro quiet splash vt.handoff=7
RelatedPackageVersions:
 linux-restricted-modules-3.0.0-14-generic-pae N/A
 linux-backports-modules-3.0.0-14-generic-pae  N/A
 linux-firmware                                1.60
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 06/08/2010
dmi.bios.vendor: Hewlett-Packard
dmi.bios.version: 68PCD Ver. F.19
dmi.board.name: 30DC
dmi.board.vendor: Hewlett-Packard
dmi.board.version: KBC Version 87.2B
dmi.chassis.type: 10
dmi.chassis.vendor: Hewlett-Packard
dmi.modalias: 
dmi:bvnHewlett-Packard:bvr68PCDVer.F.19:bd06/08/2010:svnHewlett-Packard:pnHPEliteBook6930p:pvrF.19:rvnHewlett-Packard:rn30DC:rvrKBCVersion87.2B:cvnHewlett-Packard:ct10:cvr:
dmi.product.name: HP EliteBook 6930p
dmi.product.version: F.19
dmi.sys.vendor: Hewlett-Packard

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


** Tags: apport-bug i386 oneiric running-unity

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https://bugs.launchpad.net/bugs/904630

Title:
  HP EliteBook 6930p can't shutdown

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