After upgrade to 2.6.22 (happens in any kernel since this one) FC7 doesn't 
detect serial port. There's only one serial port ("com2" settings) in my 
notebook. I't's used by built-in infraport as ordinary serial 115.200 dongle so 
if ttyS1 is not available irda doesn't work either.

Old (working) kernels' message:
Jul 13 13:44:31 localhost kernel: Serial: 8250/16550 driver $Revision: 1.90 $ 4 
ports, IRQ sharing enabled
Jul 13 13:44:31 localhost kernel: serial8250: ttyS1 at I/O 0x2f8 (irq = 3) is a 
16550A

Now:
Jul 22 21:05:39 localhost kernel: Serial: 8250/16550 driver $Revision: 1.90 $ 4 
ports, IRQ sharing enabled

might have something to do (?) with:
Jul 22 16:51:15 localhost kernel: cs: IO port probe 0x100-0x3af: excluding 
0x2f8-0x2ff 0x378-0x37f

and the only non-default HW related setting in my system is:
/etc/pcmcia/config.opts 
exclude irq 3

Tried setserial:
#setserial /dev/ttyS1 port 0x02f8 irq 3 uart 16550A
Cannot set serial info: Invalid argument

Thanks

Miroslav