[ubuntu] The Sytem freezes

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http://ubuntuforums.org – Hi all, I have Ubuntu Precise Pangolin, but I have problems with the video. I have video accellerator and video chipset integrated in my motherboard Intel dh67vr. Sometimes the desktop view is lost and sometimes the windows flick one on the other hiding and popping up suddendly. In some cases the system freezes. Can you help me? How can I look for a solution? Thanks in advance. (Hardware)