The device is fine. The USB converter uses the Prolific chip, which as far as I can tell is one of the most common ones and highly recommended for Linux. I have several different converters using it, including a $350 industrial 8-port one. They all fail (also on machines with different USB chipsets) as long as USB 2.0 is enabled. The failure is fairly subtle, so it is not always immediately obvious. Needless to say, all converters work flawlessly under Windows ... See this post: http://lkml.org/lkml/2006/6/12/279 To quote from further down the thread: "Yeah, it's a timing issue with the EHCI TT code. It's never been "correct" and we have had this problem since we first got USB 2.0 support. You were just lucky in not hitting it before" BTW, I last tried this with a fairly recent kernel (2.6.22).
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