I take it this is a relatively new card? Seeing as you're running the 2.2.16 kernel, which is over a year old, perahps a kernel update would help? I'm not making any guarantees, but I've had experience with this type of thing and a kernel upgrade did the trick. Just a thought.
2.2.19 is the latest 2.2 kernel, and 2.4.5 is the latest stable 2.4 version.
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