USB low speed devices fail to enumerate on high speed hub (high speed devices are OK) · Issue #273 · raspberrypi/linux · GitHub
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Amazon.com: USB Isolator ESD Protection Ground Loop Isolator, ADUM3160 (Only USB 2.0 Full/Low Speed, up to 1W Power) : Electronics
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Low speed device is recognised as full speed (USB tiny-like AVR isp programmer) - Electrical Engineering Stack Exchange
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