Did you try this patch to the proprietary driver?
The Raring kernel was also apparently patched and the update was also applied to Precise (weird that there is no word on Quantal...)
Since Ubuntu is terrible about sending fixes upstream this doesn't offer much help. However, if you can successfully connect with a Raring LiveUSB you might be able to find out what changes were applied and see if the Siduction team can implement them.
Ok. Will do that. I have a dvd with Ubuntu 13.04 somewhere.... Perhaps I`ll install it. I have two partitions free...
I`m sorry if my humour doesn`t please you, but as linux-distros most, I`m not for everyone