[ubuntu netbook remix] Laptop won't go idle even though it is inactive

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http://ubuntuforums.org – I have an Asus Eee 1005-HA and I am using 9.10 NBR. I am having some problems with it not going idle when it should. I have it set to turn on the screensave after 1 minute of idle (and suspend after 10). Sometimes these things work fine. Other times, it doesn't go idle at all (even if I have no programs running) - the screensaver just doesn't come on. Other times, the screensaver starts to come on, but then before it goes all the way dim, the screensaver goes off as if something woke it up. Help? (Hardware)