I'm having the same problem on a Macbook Pro 3,1. Booting through BIOS 
emulation, not EFI.
My card is a GeForce 8600M GT: 01:00.0 VGA compatible controller: NVIDIA 
Corporation G84M [GeForce 8600M GT] (rev a1)

After suspend, sometimes laptop will freeze (showing desktop with non-
moving mouse cursor), other times it will come back with functioning
mouse, but black display, which will eventually crash X. Restarting X
doesn't restore functionality.

It might be OpenGL-related, as restarting X into just lightdm works
fine; not until unity and compiz come along do things go weird.

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https://bugs.launchpad.net/bugs/1173074

Title:
  Nouveau freezes after suspend/resume in Ubuntu 13.04 / 3.8.0

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