Pau,
For the record:
we solve it. As easy as trying an Unbuntu 32 bits instead of 64! We
checked that both Hardy and Jaunty (32 bits) worked well.
Seems that there is some incompatibility between Ubuntu 64 bits kernel
and this hdsp device/driver (for which I'd love to know the reason).
I have used pure 64 bit systems for years without problems with the
hdsp/hdspm. This is most certainly not the reason.
--
Flo