Here's some other output:

$ sudo findchip -d -v
Probing for FDC37C669 ...
Wrong chip id=0xff
Wrong chip id=0xff
Probing for FDC37C669FR ...
Wrong chip id=0xff
Wrong chip id=0xff
Probing for FDC37N869 ...
Wrong chip id=0xff
Wrong chip id=0xff
Probing for FDC37C93xFR ...
Wrong chip id=0xff
Wrong chip id=0xff
Probing for FDC37N957FR ...
Wrong chip id=0xff
Wrong chip id=0xff
Probing for FDC37N958FR ...
Wrong chip id=0xff
Wrong chip id=0xff
Probing for PC87108 ...
no chip at 0x150
no chip at 0x398
no chip at 0x0ea
Probing for PC87338 ...
no chip at 0x398
no chip at 0x15c
Wrong chip id=0x00
Probing for EFER at 0x03f0 ...
hefras = 0xff 
Probing for EFER at 0x0370 ...
hefras = 0xff 
EFER seems to be probed at 0x0370
chip id = 0xff, revision = 0xff
Wrong device ID = 0xff
Probing for EFER at 0x0250 ...
hefras = 0xff 
Probing for EFER at 0x0250 ...
hefras = 0xff 
Probing for EFER at 0x03f0 ...
hefras = 0xff 
hefere = 0xff 
Probing for EFER at 0x03f0 ...
hefras = 0xff 
hefere = 0xff 
EFER seems to be probed at 0x03f0
chip ID is 0x0f : no known chip was detected.
Couldn't find Winbond superI/O chip.

In the BIOS, the chip is configured at /dev/ttyS3 and irq 0x2e8. I can
see it in dmesg:

$ dmesg | grep ttyS
[    1.318041] serial8250: ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A
[    1.318339] serial8250: ttyS3 at I/O 0x2e8 (irq = 3) is a 16550A
[    1.318770] 00:0c: ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A

In the device manager, it's listed as PNP device SMCf010 with sysfs path
/sys/devices/pnp0/00:0d

Finally,

$ lsmod | grep ir
irtty_sir                9600  0 
sir_dev               17156  1 irtty_sir
ircomm_tty        39560  0 
ircomm              23684  1 ircomm_tty
irda                  201276  4 irtty_sir,sir_dev,ircomm_tty,ircomm
crc_ccitt               3072  1 irda

and

$ sudo modprobe irda0
Password:
FATAL: Error inserting nsc_ircc 
(/lib/modules/2.6.20-16-generic/kernel/drivers/net/irda/nsc-ircc.ko): No such 
device

-- 
irda-setup (irda-utils) does not detect irda chipset on Dell Latidude D820
https://bugs.launchpad.net/bugs/176386
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