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["Etienne V." <748004@xxxxxxxxxxxxxxxxxx>]

I have the same probem with my Dell E6520 that is running a fresh install of the 13.04 Ubuntu release.
After doing suspend / resume on my computer most of the time I need to reboot it.
Don't know what's wrong and how I can diagnose the problem.
I tried to see something using the top command.
There is no process that consumes CPU, but the laptop is slow.
It's like everything is done at a lower rate.
Is there some tool that can help me to display the frequency of the CPU, or ...

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https://bugs.launchpad.net/bugs/748004

Title:
  system becomes very slow after suspend/resume

Status in “linux” package in Ubuntu:
  Incomplete

Bug description:
  My quad core i5 iMac becomes unusably slow after resuming from
  suspend.  One process will take 100% of a CPU (and nothing will run on
  the other cores).  This process is usually Xorg or beam.smp, although
  sometimes firefox or evolution will take over.  I have observed this
  with and without the ATI drivers.  Logging out and in does not fix the
  problem for more than a minute or so - only a reboot seems to clear
  the problem.

  ProblemType: Bug
  DistroRelease: Ubuntu 11.04
  Package: erlang-base 1:13.b.3-dfsg-2ubuntu3
  ProcVersionSignature: Ubuntu 2.6.38-7.39-generic 2.6.38
  Uname: Linux 2.6.38-7-generic x86_64
  Architecture: amd64
  Date: Sat Apr  2 15:01:30 2011
  ExecutablePath: /usr/lib/erlang/erts-5.7.4/bin/beam.smp
  InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Beta amd64 (20100901.1)
  ProcEnviron:
   LANGUAGE=en_AU:en
   PATH=(custom, no user)
   LANG=en_AU.UTF-8
   SHELL=/bin/bash
  SourcePackage: erlang
  UpgradeStatus: Upgraded to natty on 2011-04-01 (0 days ago)

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