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
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