The CIS error is harmless, not the problem
PCMCIA Serial and Modem Issues
error parsing CIS (Hamlet modem) (Aram Gurekian)
Date: 2000, May 23
From: David Hinds <email@example.com>
I can't tell for sure what's going on here. Certain modems seem to
fail some of the sanity checks in the linux kernel's serial device
configuration code. Maybe that is the case here.
to: "The CIS error is harmless, not the problem"