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@Ali Chen this is the web page for the product: orico.cc/goods.php?id=6056 ; they state they use the Via USB3.0 chip. Which Linux command can I run to get a better descriptor?– MikeCommented Nov 22, 2017 at 2:52
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If you work with Linux, you should be able to generate kernel logs with some USB-related filters. How? I have very little idea. You don't need a better command if the product says it is VIA. VIA is good. Therefore your software is buggy. If your really want to debug it, you need a good USB protocol analyzer, with HS mode, to see why "all responses were dropped by hub", actually two of them, on both ends of the hub. It is not possible that "all" are dropped. You likely have some bug in read pipes.– Ale..chenskiCommented Nov 22, 2017 at 3:12
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Also, are your converters really to USB 2.0 (HS mode, 480 Mbps), or of a standard FTDI type with FS protocol only? The "LabJack" is listed as FS mode. What are the others? Also, if the hub is VL811/12/13, it has only one TT, as I gathered from VIA website. One TT for 0.5Mbaud plus other streams will be taxing.– Ale..chenskiCommented Nov 22, 2017 at 4:50
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@Ali Chen thanks for explaining this to me. After more investigation, I have come to realize that one the Linux drivers is crashing. You were right it was not the USB hub. Thank you!– MikeCommented Nov 22, 2017 at 19:43
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