Public bug reported:

When select suspend in system menu, system hangs with black screen.
---
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
ApportVersion: 2.0.1-0ubuntu8
Architecture: amd64
ArecordDevices:
 **** List of CAPTURE Hardware Devices ****
 card 1: Generic_1 [HD-Audio Generic], device 0: ALC270 Analog [ALC270 Analog]
   Subdevices: 1/1
   Subdevice #0: subdevice #0
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC1: u 1846 F.... pulseaudio
 /dev/snd/controlC0: u 1846 F.... pulseaudio
CRDA:
 country TW:
  (2402 - 2472 @ 40), (3, 27)
  (5270 - 5330 @ 40), (3, 17), DFS
  (5735 - 5815 @ 40), (3, 30)
Card0.Amixer.info:
 Card hw:0 'Generic'/'HD-Audio Generic at 0xfeb44000 irq 49'
   Mixer name   : 'ATI R6xx HDMI'
   Components   : 'HDA:1002aa01,00aa0100,00100200'
   Controls : 6
   Simple ctrls : 1
Card0.Amixer.values:
 Simple mixer control 'IEC958',0
   Capabilities: pswitch pswitch-joined penum
   Playback channels: Mono
   Mono: Playback [on]
Card1.Amixer.info:
 Card hw:1 'Generic_1'/'HD-Audio Generic at 0xfeb40000 irq 16'
   Mixer name   : 'Realtek ALC270'
   Components   : 'HDA:10ec0270,10431c93,00100100'
   Controls : 14
   Simple ctrls : 8
DistributionChannelDescriptor:
 # This is a distribution channel descriptor
 # For more information see http://wiki.ubuntu.com/DistributionChannelDescriptor
 canonical-oem-anding-precise-amd64-20120615-0
DistroRelease: Ubuntu 12.04
HibernationDevice: RESUME=UUID=6c86b32a-b638-4010-96e6-5353358aedb9
InstallationMedia: Ubuntu 12.04 "Precise" - Failed to find casper uuid.conf in 
'binary/casper/initrd.img-3.2.0-25-generic.old-dkms' LIVE Binary 20120615-03:44
MachineType: ASUSTeK COMPUTER INC. X401U
NonfreeKernelModules: fglrx
Package: linux (not installed)
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcFB: 0 EFI VGA
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.2.0-25-generic 
root=UUID=f81b8638-8757-4f78-90b5-24a5b0d41bf8 ro quiet splash vt.handoff=7
ProcVersionSignature: Ubuntu 3.2.0-25.40-generic 3.2.18
RelatedPackageVersions:
 linux-restricted-modules-3.2.0-25-generic N/A
 linux-backports-modules-3.2.0-25-generic N/A
 linux-firmware 1.79
SourcePackage: linux
Tags: precise precise
Uname: Linux 3.2.0-25-generic x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
dmi.bios.date: 06/07/2012
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: X401U.301
dmi.board.asset.tag: ATN12345678901234567
dmi.board.name: X401U
dmi.board.vendor: ASUSTeK COMPUTER INC.
dmi.board.version: 1.0
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: ASUSTeK COMPUTER INC.
dmi.chassis.version: 1.0
dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvrX401U.301:bd06/07/2012:svnASUSTeKCOMPUTERINC.:pnX401U:pvr1.0:rvnASUSTeKCOMPUTERINC.:rnX401U:rvr1.0:cvnASUSTeKCOMPUTERINC.:ct10:cvr1.0:
dmi.product.name: X401U
dmi.product.version: 1.0
dmi.sys.vendor: ASUSTeK COMPUTER INC.

** Affects: linux (Ubuntu)
     Importance: Undecided
     Assignee: AceLan Kao (acelankao)
         Status: In Progress


** Tags: blocks-hwcert-enablement

** Changed in: linux (Ubuntu)
     Assignee: (unassigned) => AceLan Kao (acelankao)

** Changed in: linux (Ubuntu)
       Status: New => In Progress

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https://bugs.launchpad.net/bugs/1022428

Title:
  [X401U] [X501U] Cannot enter S3 state

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