Well I managed to get some tests in with that other old cheapie USB adapter that I had kicking around, and I'm not sure what's changed but Diablo has definately made a signficant difference to making it work. With the latest USB LAN installed I simply connected it to my OTG swivel, the cat.5e cable and then plugged the whole shebang into the N800 and did a quick dmesg check and sure enough all of the errors and problems that I'd seen on Chinook were gone! I grabbed the product ID as described in my previous post, added it to the udev rules and disconnected/reconnected the OTG adapter and everything just worked. What's even more interesting is that the one I have here although visually identical identifies itself as an ADM8511 Pegasus II chipset, so not even the RTL one and it still seems to work fine. It took a little bit to get an IP (about 10-20 seconds after plugging it in I noticed my SIP connection came up), but after that worked just fine. I tried it for about 20 minutes and no drops or other odd behaviour.

Definitely something to do with Diablo updates though as I tried it on my other N800 that's still running Chinook and it went back to the original haphazzard buggy behaviour I had reported before! So there's hope yet... One thing I did notice is that it draws more power than the USB100M though... on this Pegasus dmesg told me there was 15mA power budget left, and with the USB100M I know there's usually more than that... but that's not a big concern as if you're going to have a LAN cable plugged in, you're probably going to have a charger connected as well. My charger's not here at the moment but I'll try to check that later this evening to make sure connecting it doesn't disrupt anything (hasn't done in the past for me...).

Thanks,
-Rob