[ubuntu] Password sometimes not accepted on first try

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http://ubuntuforums.org – Sometimes my password isn't accepted on the first try, but it's always accepted on the second try. I'm SURE it's entered correctly, and there are no characters present before I start (unless they can be there and not have a dot present). I can't be sure when it's going to work or not work, though problems seem more likely at first start in the morning. Second likely is when it's been totally shut down, but not overnight. I don't recall there ever being a problem from a normal restart. If I just hit "enter" before I enter the password, or enter a garbage password first, it (Hardware)