Thank you for your answer, David.
I'm sorry bothering you again, but here are two other questions (which perhaps may be of some interest for others, too; and I don't know anybody else knowing the answer).
1) As the cardbus bridge in my laptop has obviously problems in delivering the interrupt properly, is the problem likely to appear with other network cards, too? I.e., only with 32bit cardbus cards or also with 16bit pc cards; of which type should my next card be?
2) Facing the fact that the d-link card works under windoze (windoze or the win driver (?) obviously not taking care of the delivery problems...), the following came to my mind: ok, you said that the driver is not the problem. I admit that, as long as one has "normal" hardware (cardbus bridge) that behaves correctly. Would it be theoretically possible to either modify the driver or the piece of code in any other program concerned with receiving the improperly delivered interrupt, so that the hardware bug is ignored?