Untested due to lack of CardBus card...
diff -ruN linux-original/drivers/pcmcia/cs.c linux/drivers/pcmcia/cs.c
--- linux-original/drivers/pcmcia/cs.c 2003-03-28 19:59:53.000000000 +0100
+++ linux/drivers/pcmcia/cs.c 2003-03-28 19:59:17.000000000 +0100
@@ -647,6 +647,8 @@
DEBUG(1, "cs: send_event(sock %d, event %d, pri %d)\n",
s->sock, event, priority);
ret = 0;
+ if (s->state & SOCKET_CARDBUS)
+ return 0;
for (; client; client = client->next) {
if (client->state & (CLIENT_UNBOUND|CLIENT_STALE))
continue;