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I bought a cheap VK-QF9700 to connect to my new Raspberry PI Zero. I know the chipset (DM9601) had some problems with the Raspbian kernel that has been recently updated.

The problem I have is that if I power on the Raspberry, wait for the boot to finish and then plug the Ethernet adapter in the Micro USB, everything works fine.

But if I leave the adapter plugged in and try to boot, the adapter does not get recognized.

I run lsusb in rc.local to check if it is detected, but the command just shows me the standard USB Hub without any devices attached.

I tried resetting (with a utility I found around, usbreset) the USB hub, but nothing happens.

Any ideas?

  • I have a similar problem with other usb devices on my Pi Zero, it only seems to happen when I use certain otg adapters. – Patrick Cook Mar 12 '16 at 18:46
  • Thank you Patrick. Did you manage to fix it in any way? I don't use any adapter,I directly attach the USB Ethernet device to the micro USB of the raspberry. Marco – MarcoT74 Mar 13 '16 at 21:26
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I had the same problem with my usb ethernet adapter but I solved it in my case by removing the settings used to connect the pi over usb to my laptop.

These settings are not default however and I added these myself before.

So for raspbian Jessie this is:

  1. Go into your boot partition, it is automaticly mounted at /boot/
  2. From config.txt remove dtoverlay=dwc2
  3. From cmdline.txt remove modules_load=dwc2,g_ether

For me this solved the problem and after a reboot ethernet directly showed up. However you cannot ssh into the pi anymore using usb, which seem unneccessary anyway because you have an ethernet now.

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