I'm solo-mining on my Avalon chip-based rigs and they seem to be using getwork and not GBT.
In the "More Options(Default: --quiet)" field I've tried the trio of "--quiet --no-getwork --no-stratum" and then it won't start hashing at all.
So, when solo mining, I'm getting about 1850 Getworks per minute and about 185 Getwork Fails (10% seems like a non-random number)...
Some system stats:
Firmware-20131110, cgminer-3.4.3, 16x55nm chips, about 200gh/s total per unit
My impression is that you must use stratum to get an Avalon to mine. I pulled a version of eloipool and modified it to work with an alt coin, and my Batch #2 Avalon did mine 1 block with it. This was just proof of concept and curiosity, not a production mining configuration.
Well, hell. I'll go look at it and tell it "you make me sad" straight out of Monty Python.
I've been tinkering and messing with settings but don't want to stray too far from what's working well for me.