Public bug reported:

Every time I turn my computer on, it hard freeze after a few minutes.
Mouse and keyboard doesn't respond, and I can't switch to any VT
(ctrl+alt+Fn won't work). All I can do is either reset or hard shutdown,
pressing the cabinet buttons. The problem started when I updated from
Ubuntu 12.10 to 13.04. Now it always happens the first time I boot, and
I need to reboot two or three times until it doesn't happen anymore.

As always I suspect it has to do with my GPU: ATI Radeon 4870 (AMD
RV770, by glxinfo), using kernel and free drivers from repository,
always updated.

** Affects: xorg (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1186483

Title:
  System freezes few minutes after boot

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