[ubuntu] 13.04: touchpad strongly favoring straight lines?

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http://ubuntuforums.org – My cursor will trace an octagonal shape if I make a circular motion, or a square if the area traced is that of a desktop icon. I see how something like this happening to a lesser degree could be helpful in graphics work, but not for me. Is there a way to disable/fix it? I have an Acer Aspire 7750G-6444, and this has been happening since I installed Ubuntu a couple days ago. My mouse tracks normally. (Hardware)