My sticks never come up as ICA - they either come up as BEE or BES. BES works best, I usually expect them to stop working when they report as BEE, and when they do it's almost always cured by changing the USB port the hub is plugged in to.
Under Ubuntu 13.04 Server, the hubs worked best plugged in to the USB3 ports - under Windows best in USB2 ports. Same hubs, same machine.
The staged underrun thing seems normal, I get that here too. Mine usually ends up queuing 4 or 8.
Which switch are you using? "-S all" or "-S erupter:all" or "--scan-serial erupter:*"
Icarus flags or no?
Now that I moved the 3 problem children to the windows box and using -S all they do show up as ICA on there and have given me zero problems..
It has always showed me 3 as BES and the rest as ICA on the pi.
Now that I have moved the 3 "oddballs" off of the pi everything has been rolling smootly but then, all of sudden about 15 of them went to ERR at the same time and all restarted.. They did ALL restart fine though.
I realize it could be power or hubs or cooling or one bad erupter or a driver or etc etc... Just trying to find out more if I can since it has been so rock solid up until this point. I have been swapping ports & hubs & power adapters & erupters.
Maybe running the getwork server and the erupters is a little too much for the pi?
As for the queue they both (win7 miner and pi miner) have queued up, but only a little 2-4.