Comment 0 for bug 987933

Basically, if I shutdown soon after login on, my system shuts down and powers off ok but it I use the system for any prolonged time and try to shutdown, it hangs at the very last minuites. Based on the advice from Bug #985471, I modified /etc/default/grub,
changing
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
to
GRUB_CMDLINE_LINUX_DEFAULT="reboot=pci quiet splash"

Having done this, I am able to reboot my system however long I have been using it. So my current shutdown routine is, first reboot and wait for the login screen, then from there shutdown.
Thanks for your help.

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: linux-image-3.2.0-23-generic-pae 3.2.0-23.36
ProcVersionSignature: Ubuntu 3.2.0-23.36-generic-pae 3.2.14
Uname: Linux 3.2.0-23-generic-pae i686
NonfreeKernelModules: nvidia wl
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
ApportVersion: 2.0.1-0ubuntu5
Architecture: i386
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: napo 2023 F.... pulseaudio
CRDA: Error: command ['iw', 'reg', 'get'] failed with exit code 1: nl80211 not found.
Card0.Amixer.info:
 Card hw:0 'Intel'/'HDA Intel at 0xf6ffc000 irq 46'
   Mixer name : 'SigmaTel STAC9228'
   Components : 'HDA:83847616,1028022e,00100402'
   Controls : 27
   Simple ctrls : 18
CurrentDmesg:
 [ 51.002362] type=1400 audit(1335280536.452:26): apparmor="DENIED" operation="open" parent=1 profile="/usr/lib/telepathy/mission-control-5" name="/usr/share/gvfs/remote-volume-monitors/" pid=2307 comm="mission-control" requested_mask="r" denied_mask="r" fsuid=1000 ouid=0
 [ 51.040044] eth2: no IPv6 routers present
 [ 545.036937] type=1400 audit(1335281030.487:27): apparmor="DENIED" operation="open" parent=1 profile="/usr/lib/telepathy/mission-control-5" name="/usr/share/gvfs/remote-volume-monitors/" pid=3191 comm="mission-control" requested_mask="r" denied_mask="r" fsuid=1000 ouid=0
Date: Tue Apr 24 18:02:51 2012
HibernationDevice: RESUME=UUID=cd96f6c2-293c-4b89-94be-94620eef118c
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release i386 (20120423)
MachineType: Dell Inc. XPS M1530
ProcEnviron:
 LANGUAGE=en_GB:en
 TERM=xterm
 PATH=(custom, no user)
 LANG=en_GB.UTF-8
 SHELL=/bin/bash
ProcFB: 0 VESA VGA
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.2.0-23-generic-pae root=UUID=124e4ea7-c7e6-4770-bf12-0057305672a4 ro reboot=pci quiet splash vt.handoff=7
RelatedPackageVersions:
 linux-restricted-modules-3.2.0-23-generic-pae N/A
 linux-backports-modules-3.2.0-23-generic-pae N/A
 linux-firmware 1.79
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 11/19/2008
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A12
dmi.board.name: 0D501F
dmi.board.vendor: Dell Inc.
dmi.chassis.type: 8
dmi.chassis.vendor: Dell Inc.
dmi.modalias: dmi:bvnDellInc.:bvrA12:bd11/19/2008:svnDellInc.:pnXPSM1530:pvr:rvnDellInc.:rn0D501F:rvr:cvnDellInc.:ct8:cvr:
dmi.product.name: XPS M1530
dmi.sys.vendor: Dell Inc.