Ubuntu often hangs during shutdown

[Constantine]

Ubuntu often hangs when shutdown screen appears

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: linux-image-3.2.0-19-generic-pae 3.2.0-19.31
ProcVersionSignature: Ubuntu 3.2.0-19.31-generic-pae 3.2.12
Uname: Linux 3.2.0-19-generic-pae i686
NonfreeKernelModules: fglrx
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
ApportVersion: 1.94.1-0ubuntu2
Architecture: i386
ArecordDevices:
 **** List of CAPTURE Hardware Devices ****
 card 0: Intel [HDA Intel], device 0: ALC268 Analog [ALC268 Analog]
   Subdevices: 1/1
   Subdevice #0: subdevice #0
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC1: constantine 1767 F.... pulseaudio
 /dev/snd/controlC0: constantine 1767 F.... pulseaudio
Card0.Amixer.info:
 Card hw:0 'Intel'/'HDA Intel at 0xf4500000 irq 46'
   Mixer name : 'Realtek ALC268'
   Components : 'HDA:10ec0268,1025013c,00100101 HDA:14f12c06,10250093,00100000'
   Controls : 17
   Simple ctrls : 9
Card1.Amixer.info:
 Card hw:1 'HDMI'/'HDA ATI HDMI at 0xcfeec000 irq 47'
   Mixer name : 'ATI R6xx HDMI'
   Components : 'HDA:1002aa01,00aa0100,00100000'
   Controls : 6
   Simple ctrls : 1
Card1.Amixer.values:
 Simple mixer control 'IEC958',0
   Capabilities: pswitch pswitch-joined penum
   Playback channels: Mono
   Mono: Playback [on]
Date: Wed Mar 21 22:21:25 2012
HibernationDevice: RESUME=UUID=a85e1013-a0be-4933-9537-ce37c7614318
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Alpha i386 (20120306)
MachineType: Acer Extensa 5630
PccardctlIdent:
 Socket 0:
   no product info available
PccardctlStatus:
 Socket 0:
   no card
ProcEnviron:
 LANG=ru_RU.UTF-8
 SHELL=/bin/bash
ProcFB: 0 VESA VGA
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.2.0-19-generic-pae root=UUID=872eceb4-ef07-4bea-ac2e-a09235e50e47 ro quiet splash vt.handoff=7
RelatedPackageVersions:
 linux-restricted-modules-3.2.0-19-generic-pae N/A
 linux-backports-modules-3.2.0-19-generic-pae N/A
 linux-firmware 1.71
SourcePackage: linux
UpgradeStatus: Upgraded to precise on 2012-03-21 (0 days ago)
dmi.bios.date: 08/05/2008
dmi.bios.vendor: Phoenix Technologies LTD
dmi.bios.version: V1.19
dmi.board.name: Homa
dmi.board.vendor: Acer
dmi.board.version: Rev
dmi.chassis.type: 10
dmi.chassis.vendor: Acer
dmi.chassis.version: N/A
dmi.modalias: dmi:bvnPhoenixTechnologiesLTD:bvrV1.19:bd08/05/2008:svnAcer:pnExtensa5630:pvr0100:rvnAcer:rnHoma:rvrRev:cvnAcer:ct10:cvrN/A:
dmi.product.name: Extensa 5630
dmi.product.version: 0100
dmi.sys.vendor: Acer