>> Plugging them into the same port (!) on my device one of them is >> recognized as SuperSpeed, the other as high speed ??? >> (working on 4.14.129 LTS) >> >> From dmesg, the "faulty" one: >> [ 530.585871] usb 1-2: new high-speed USB device number 4 using >> xhci_hcd <<<<<<<<< HUH ???? >> > XHCI is not like EHCI. It needs no companion controller, as it serves > all speeds. > ... > > This is on a lower layer than ax88179. This comes from xhci_hcd. > Is this a regression? > I don't think its a regression. Meanwhile some more strange things: Depending on how fast i plug in the "faulty" one, sometimes it is recognized as a SuperSpeed too. But then, i have made the following observation: - ping from the device to a host works (and vice versa) - scp-ing a file from host to to device the adapter suddenly stalls, but i don't see any error message in dmesg - device then is stalled, ping doesn't work any more - unbind/bind driver recovers the adapter (and always returns SuperSpeed mode) - ping works, scp breaks it again - leaving the device in stall, scp tells "lost connection" on the host after ~10 minutes Is there something i can do to force an error message to be seen when the ETH2USB adapter stalls? My current assumption is that the signal quality of the USB port is at a corner case, and therefore some "better" Adapters work, some "bad ones" don't. But as there is no error message seen in the dmesg, i am somehow lost. Best regards Carsten
