Gnome Shell freezes after resuming from hibernation

[mintGianluca]

Hello everybody,
I am a fanatic user of Linux Mint and had no problem with it while I was using my old laptop, on which I was running Linux Mint 11 x64.
As I have changed my laptop, I also decided to upgrade my preferred OS and installed Linux Mint 12 x64, but I have a huge problem when I resume from hibernate.

The system seems to perfectly recover from hibernation... as long as I don't try to interact with it.
The mouse cursor moves, but I don't manage to click anywhere and if I try to change the application in foreground, by using ALT+TAB or try to start a new application by using the Super (Windows) key on the keyboard or by moving the mouse pointer on the top left corner of the screen, well... then the computer partially freezes: the screen becomes darker, but the menu with the application list is not shown, everything stops working, altough the background processes go on (I can go on hearing music, for example, although I can't change the playing track, or hear the sound of the movie I'm watching).

In the pm-suspend.log there's nothing unsuccessful. Anybody has a clue about how to solve it?

In case it might help, my laptop's a Hewlett Packard 5650b, whose specs are here: http://h10010.www1.hp.com/wwpc/us/en/sm ... html?dnr=1

I don't copy and paste them because I have no clue about which ones might be of any interest.

Thanks in advance for the help,
Gianluca