Public bug reported:

I'm running a Dell Inspiron 1520 with an Nvidia GeForce 8400M GS.
The computer hangs on shutdown and reboot.
I tried adding INIT_HALT = POWEROFF to /etc/default/halt and that seems to stop 
the problem with rebooting.
I tried changing video drivers from 295.40 to 290.10 as I read in a thread on 
launchpad.  That did not help.

I did a clean install and the problem persists.

I didn't have this problem on 11.10 although I've heard that some people
did.

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: linux-image-3.2.0-24-generic-pae 3.2.0-24.37
ProcVersionSignature: Ubuntu 3.2.0-24.37-generic-pae 3.2.14
Uname: Linux 3.2.0-24-generic-pae i686
NonfreeKernelModules: nvidia
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
ApportVersion: 2.0.1-0ubuntu7
Architecture: i386
ArecordDevices:
 **** List of CAPTURE Hardware Devices ****
 card 0: Intel [HDA Intel], device 0: STAC92xx Analog [STAC92xx Analog]
   Subdevices: 1/1
   Subdevice #0: subdevice #0
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC0:  john       1674 F.... pulseaudio
CRDA:
 country GB:
        (2402 - 2482 @ 40), (N/A, 20)
        (5170 - 5250 @ 40), (N/A, 20)
        (5250 - 5330 @ 40), (N/A, 20), DFS
        (5490 - 5710 @ 40), (N/A, 27), DFS
Card0.Amixer.info:
 Card hw:0 'Intel'/'HDA Intel at 0xfebfc000 irq 44'
   Mixer name   : 'SigmaTel STAC9205'
   Components   : 'HDA:838476a0,102801f1,00100204 
HDA:14f12c06,14f1000f,00100000'
   Controls      : 20
   Simple ctrls  : 11
Date: Mon Apr 30 16:05:56 2012
HibernationDevice: RESUME=UUID=e807c351-7667-4dda-ae6f-54242257fff4
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release i386 (20120423)
MachineType: Dell Inc. Inspiron 1520
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcFB: 0 VESA VGA
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.2.0-24-generic-pae 
root=UUID=9a7ba5a2-fec1-4ef4-9a64-88a335751e3c ro quiet splash vt.handoff=7
RelatedPackageVersions:
 linux-restricted-modules-3.2.0-24-generic-pae N/A
 linux-backports-modules-3.2.0-24-generic-pae  N/A
 linux-firmware                                1.79
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 07/11/2008
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A09
dmi.board.name: 0UW306
dmi.board.vendor: Dell Inc.
dmi.chassis.type: 8
dmi.chassis.vendor: Dell Inc.
dmi.modalias: 
dmi:bvnDellInc.:bvrA09:bd07/11/2008:svnDellInc.:pnInspiron1520:pvr:rvnDellInc.:rn0UW306:rvr:cvnDellInc.:ct8:cvr:
dmi.product.name: Inspiron 1520
dmi.sys.vendor: Dell Inc.

** Affects: ubuntu
     Importance: Undecided
         Status: New


** Tags: apport-bug i386 precise

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https://bugs.launchpad.net/bugs/991977

Title:
  Ubuntu 12.04 hangs on shutdown

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