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I have two USB devices that fail to work when plugged into any of the onboard USB ports. The following appears in dmesg:
DEBUG:handle_hc_chhltd_intr_dma:: XactErr without NYET/NAK/ACK
One is the aluminum Apple USB keyboard, the other is a realtek wifi adapter. Both of the devices work if plugged into a powered USB hub (I haven't tried when the hub is not AC powered.) Some folks are suggesting that this is not a power problem though, that it could be a USB issue that is inadvertently solved when a hub is used.
So - is this a power issue or a USB timing issue?
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