[ubuntu] Lenovo S12 freeze

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http://ubuntuforums.org – Hi, a few days ago i bought a Lenovo S12 and installed a crypted Ubuntu Karmic on it. The problem is, that the system freezes really often. But when i hit a key or move the mouse the system moves on. I have the Lenovo S12 with Atom processor and Intel GMA gfx. Can anyone help me? Best regards, MKay (Hardware)