Simon Strandman, thank you for reporting this and helping make Ubuntu better. 
Could you please execute the following via a terminal:
apport-collect -p linux 968265

As well, using the fglrx-installer provided by Ubuntu, could you please
provide the information following
https://wiki.ubuntu.com/DebuggingKernelSuspend ?

** Also affects: linux (Ubuntu)
   Importance: Undecided
       Status: New

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

** Tags added: high-spu

** Tags removed: high-spu
** Tags added: high-cpu

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You received this bug notification because you are a member of Desktop
Packages, which is subscribed to fglrx-installer in Ubuntu.
https://bugs.launchpad.net/bugs/968265

Title:
  Resuming from sleep leaves Xorg using 100% CPU and unable to turn on
  the screen

Status in “fglrx-installer” package in Ubuntu:
  Confirmed
Status in “linux” package in Ubuntu:
  Incomplete

Bug description:
  With the open source radeon driver the system correcty resumes from
  sleep, but after installing fglrx or fglrx-updates the screen is just
  black when resuming. The computer hasn't actually hung so I can SSH to
  it. At that point Xorg is using 100% CPU and I'm unable to kill or
  restart the process (even when using kill -9). I'm not sure what to do
  about this but I guess it should be possible to check what Xorg is
  stuck doing.

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: fglrx-updates 2:8.960-0ubuntu1
  ProcVersionSignature: Ubuntu 3.2.0-20.33-generic 3.2.12
  Uname: Linux 3.2.0-20-generic x86_64
  NonfreeKernelModules: fglrx
  ApportVersion: 1.95-0ubuntu1
  Architecture: amd64
  Date: Thu Mar 29 16:06:27 2012
  InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Alpha amd64 
(20120306)
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   LANG=sv_SE.UTF-8
   SHELL=/bin/bash
  SourcePackage: fglrx-installer-updates
  UpgradeStatus: No upgrade log present (probably fresh install)

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