Fujitsu Lifebook S-4546 - Had a problem with PCMCIA, cardmgr would not recognize PCMCIA cards when I inserted them.  This was happening for my CompactFlash adapter, and my Megahertz modem.  I don't really know when or how things got changed, I just knew that it sucked when it stopped working right :)  When the card was inserted, you'd hear the high beep, then the low beep, meaning something didn't work.  I read the PCMCIA HOWTO from the PCMCIA project @ sourceforge, and they recommended adding some more high memory ranges to the file config.opts, which is where cardmgr gets it's settings from on startup.  I added them and lo! it worked.  If you make changes to your config.opts file, make sure you restart cardmgr by using the 'pcmcia' script in /etc/init.d:

/etc/init.d/pcmcia restart

Here's my config.opts file in CVS.