100% CPU usage after wake up

Hello all,

I've installed pinguyos and it is the First Linux distro that works completely out of the box for me. Wifi, Flash player in Firefox, access to my network windows drives, vlc that works, no graphics glitches,...I'm really impressed...
But (there is a but of course...)

When my laptop wakes up, the cpu usage is at 100%, the fan is on all the time and everything is really slow.

Here is a picture of the ressource monitor after wake up



and ALL the active processes ordered by cpu activity (nothing seems wrong here)


When I try to log out, I see many users connected ???



My laptop is a toshiba L505-13x
Intel® Core™ i3-330M
4gb DDR3
ATI Mobility Radeon™ HD 5145

Would be really gratefull if someone could help me out, thanks