[ubuntu] Laptop keeps making a sound.

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http://ubuntuforums.org – Hello. My laptop, which is running Ubuntu 9.10, will periodically make a sound that sounds like someone is plugging something into a sound jack. I will try to get a recording of it, but that doesn't seem likely anytime soon. I tried disabling my internal mic, and that didn't fix it. It makes it even when my speakers are muted, which makes me think it's because some hardware is not correctly configured. I have an HP dv6236us laptop. Here is my lspci output. Dunno if it will help, but it can't hurt: Code: 00:00.0 Host bridge: Intel Corporation Mobile 945G (Hardware)