Hi
I ‘d think it is the driver responsible for not waking up correctly. Of course I cannot make 100% connection between windows drivers and linux drivers, but with Linux, I had many such experiences. Usually the driver is still in an experimental stage, etc, and the wake up is not implemented, or the driver is screwed up in code.
I would look for a driver update. Since you say the other PCMCIA cards wake up just fine, I wouldnt think about blaming your PCMCIA slot.
Cheers
Ben