No suspend upon lid closure

[selection.disabled]

My laptop does not suspend when i close the lid.It however suspends by using the command from gnome's user menu. Also no problem in windows 7 x64. I don't know if the bug report i created by apport includes my system information but here i give my specs anyway:

Intel Core i7 720 QM
4GB DDR 3 1333mhz SDRAM
Intel PM55 Express Chipset
ATI® Madison - Mobility Radeon HD 5650, 1GB GDDR3 VRAM
15.6“W HD glare panel(1920x1080), LED Backlight Display
DVD Super-Multi; High Definition Disc Blu-ray Combo DVD
Gigabit LAN
Wireless LAN, 802.11a/b/g/n
Bluetooth Ver. 2.1 module with USB2.0 interface
2M Pixel CMOS via USB2.0 interface.
Integrated Fingerprint Reader

I/O System

    USB 2.0 x 4, all are with Power USB feature
    RGB; VGA port x 1, 15pins
    Microphone-in x 1
    Headphone-out x 1
    CIR x 1 for remote controller (option, with TV Tuner)
    RF-in x 1 (option, with TV Tuner)
    DC-in jack x 1
    RJ-45 jack x 1
    Kensington lock x 1
    3-in-1 Flash Card Reader(SD/MMC/MS) x 1
    Internal microphone x 2
    HDMI x 1

Battery

6 Cell Li-Ion, 18650 type, 4800/5200mAH

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Thanks in advance for the support.
Thanks for the great work, keep it up :)

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: acpi-support 0.140
ProcVersionSignature: Ubuntu 3.2.0-31.50-generic-pae 3.2.28
Uname: Linux 3.2.0-31-generic-pae i686
NonfreeKernelModules: fglrx
ApportVersion: 2.0.1-0ubuntu13
Architecture: i386
Date: Wed Oct 17 00:53:49 2012
InstallationMedia: Ubuntu 12.04.1 LTS "Precise Pangolin" - Release i386 (20120817.3)
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: acpi-support
UpgradeStatus: No upgrade log present (probably fresh install)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.