For those of you with Nvidia cards having this problem: if you feel like
giving it a try I solved it by doing two things, but I am not sure if
the combination of both gave me the solution or just the last one:

I first installed Michael Kuhn ppa and upgraded the system:
sudo apt-add-repository -y ppa:suraia/ppa
sudo apt-get update && sudo apt-get -y dist-upgrade

Finally I installed xorg-edgers fresh X crack ppa to use the nvidia beta 
drivers:
sudo apt-add-repository - y ppa:xorg-edgers/ppa
sudo apt-get update && sudo apt-get install -y nvidia-current

I then disabled this last ppa from software sources to prevent updates
to the driver that is finally working as it should: the random red
screen bug and freeze at shutdown/reboot and the black screen with the
moving cursor problem are gone (I tried suspending the computer with
tons of programs opened for hours and it worked as it used to with
Maverick).

Note that this will leave your computer running the 3.5.0-4-generic kernel.
YMMV

Toshiba Qosmio X500 Core i7 + Nvidia 360GTM

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https://bugs.launchpad.net/bugs/966744

Title:
  Resume from suspend leaves me with black screen or a screen of the
  desktop before it suspended (though the mouse still moves/changes
  cursor)

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