It just doesn't want to work. I've spent 5 whole days with this, and still doesn't work.

The port is recognized at startup when IrDA is activated in the BIOS:

# dmesg | grep tty
ttyS1 at I/O 0x2f8 (irq = 3) is a NS16550A

On the smsc.com website they say, that Customer IR is supported... I'll try the smsc kernel drivers.