PCI Modems and Linux?

Torey asks: "I recently acquired a Fujitsu 985TX laptop which I was informed was very Linux compatible. Well, so far it appears to be only 90% compatible. The built in modem appears to be a PCI modem (lspci reports it is a Lucent Microelectronics modem), which I have experienced to be highly unsupported in the kernel. Has anyone been successful in getting one of these to work? The PnP tools didn't notice it either. Any help would be greatly appreciated." What other PCI modems are problematic with Linux? Which ones do you all recommend?