Ubuntu freezes when suspending

[shrijit]

Whenever I try to suspend my laptop(Dell Latitude 3440, currently running ubuntu 14.04 with 4.4.0-31-generic) the screen goes black and it freezes and it does not suspend properly. I am only left with option of forcefully shutting it down. I previously thought the bug was due to using of nvidia drivers, so i deleted all the drivers. The problem was still there so i thought of upgrading the kernel to the latest kernel and deleting the old ones. So i deleted the old kernels after installing 4.4.0.

System information:
1)Release of ubuntu
Description: Ubuntu 14.04.4 LTS
Release: 14.04

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: linux-image-4.4.0-31-generic 4.4.0-31.50~14.04.1
ProcVersionSignature: Ubuntu 4.4.0-31.50~14.04.1-generic 4.4.13
Uname: Linux 4.4.0-31-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.21
Architecture: amd64
CurrentDesktop: Unity
Date: Wed Jul 27 01:24:39 2016
InstallationDate: Installed on 2015-10-31 (269 days ago)
InstallationMedia: Ubuntu 14.04.2 LTS "Trusty Tahr" - Release amd64 (20150218.1)
SourcePackage: linux-lts-xenial
UpgradeStatus: No upgrade log present (probably fresh install)