HP Notebook Pavilion g6-2101sl freeze

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http://askubuntu.com – I just bought this notebook and I've already installed in a new partition Ubuntu 12.04 LTS with 6gb of swap memory. Sometimes (without any special conditions) Ubuntu freeze. My mouse is blocked, the UI is blocked, ALT+F1 to kill something or to restart is blocked, I can't really do nothing... I've also tried and it freeze with: Ubuntu 3D Ubuntu 2D Gnome Shell and it freeze both with low and high load. I can only press on power button (physically) and restart my laptop (and this is not the correct way to do things). I'm using this laptop for work, so I need a stable OS without this freez (HowTos)