The pcmcia subsystem fails to detect the modem part of a multifunction pcmcia
card (3com megahertz 3cxem556b net+modem). This card worked fine with pcmcia-cs,
and the problem appeared in FC5 and also in rawhide, with pcmciautils. I tested
this case with two laptops, a T60p with FC5 fully updated, and a T40 running
rawhide. This is what I obtain, when I insert the card (pccardctl eject ;
pccardctl insert), there's no trace of the modem function:

Sep 24 22:47:02 localhost kernel: pccard: PCMCIA card inserted into slot 0
Sep 24 22:47:02 localhost kernel: pcmcia: registering new device pcmcia0.0
Sep 24 22:47:02 localhost kernel: eth0: 3Com 3c589, io 0x300, irq 3, hw_addr
00:00:86:36:E0:9F
Sep 24 22:47:02 localhost kernel:   8K FIFO split 5:3 Rx:Tx, auto xcvr

I grabbed the cis file from the old pcmcia-cs package, and put it in
/lib/firmware/3CXEM556.cis to make udev helper functions happy.

I also recompiled cardmgr from the latest pcmcia-cs tarball, and went a bit
further, when launching cardmgr, the modem capabilities are detected by the
kernel, the serial_cs module is loaded, the /dev/modem is created:

pcmcia: Detected deprecated PCMCIA ioctl usage from process: cardmgr.
pcmcia: This interface will soon be removed from the kernel; please expect
breakage unless you upgrade to new tools.
pcmcia: see http://www.kernel.org/pub/linux/utils/kernel/pcmcia/pcmcia.html for
details.
pcmcia: registering new device pcmcia0.1
0.1: ttyS0 at I/O 0x3f8 (irq = 3) is a 16550A
eth0: interrupt(s) dropped!
2.6. kernels use pcmciamtd instead of memory_cs.c and do not require special
MTD handling any more.

The modem is detected, but doesn't respond to any at commands (same irq thatn
network ? conflict with pcmciautils ? maybe). But as pcmcia-cs is deprecated,
this is certainly not the way to solve this issue. Anyway, this demonstrates
that the modem function is available, and probably should work out-of-the-box
with kernel support+pcmciautils.

[root@bonobo pcmcia]# find /sys/bus/pcmcia/
/sys/bus/pcmcia/
/sys/bus/pcmcia/drivers
/sys/bus/pcmcia/drivers/3c589_cs
/sys/bus/pcmcia/drivers/3c589_cs/bind
/sys/bus/pcmcia/drivers/3c589_cs/unbind
/sys/bus/pcmcia/drivers/3c589_cs/module
/sys/bus/pcmcia/drivers/3c589_cs/0.0
/sys/bus/pcmcia/devices
/sys/bus/pcmcia/devices/0.0
[root@bonobo pcmcia]# find /sys/class/pcmcia_socket/
/sys/class/pcmcia_socket/
/sys/class/pcmcia_socket/pcmcia_socket0
/sys/class/pcmcia_socket/pcmcia_socket0/available_resources_mem
/sys/class/pcmcia_socket/pcmcia_socket0/available_resources_io
/sys/class/pcmcia_socket/pcmcia_socket0/cis
/sys/class/pcmcia_socket/pcmcia_socket0/available_resources_setup_done
/sys/class/pcmcia_socket/pcmcia_socket0/card_irq_mask
/sys/class/pcmcia_socket/pcmcia_socket0/card_eject
/sys/class/pcmcia_socket/pcmcia_socket0/card_pm_state
/sys/class/pcmcia_socket/pcmcia_socket0/card_insert
/sys/class/pcmcia_socket/pcmcia_socket0/card_vcc
/sys/class/pcmcia_socket/pcmcia_socket0/card_vpp
/sys/class/pcmcia_socket/pcmcia_socket0/card_voltage
/sys/class/pcmcia_socket/pcmcia_socket0/card_type
/sys/class/pcmcia_socket/pcmcia_socket0/device
/sys/class/pcmcia_socket/pcmcia_socket0/uevent

Any hint on how I can investigate further on this issue ?