lirc_sir doesn't work on my Dell C640

[Sergey I. <le...@ro...>]

I'm trying to have LIRC work on my laptop - Dell Latitude C640.

I downloaded lirc-0.7.1 sources and compiled lirc modules
as well as lirc utilities. In BIOS settings I configured SIR
mode on COM4. I freed COM4 with setserial and tried to load
lirc_sir module with io and irq parameters and without (module
was compiled with proper io and irq by default).

lirc_sir and lirc_dev can load. There is /dev/lirc device is created
dmesg gives following:

lirc_dev: IR Remote Control driver registered, at major 61
lirc_dev: lirc_register_plugin: sample_rate: 0
lirc_sir: I/O port 0x02e8, IRQ 3.
lirc_sir: Installed.

However if I try mode2 -d /dev/lirc or irrecord -d /dev/lirc testlirc
nothing shows up on the screen and even though I can start lircd it
doesn't report anything to /var/log/lircd.

Any hints on what I'm doing wrong will be much appreciated.

lirc_sir supposed to work with build-in SIR ports, right ? Don't
understand what could be wrong here.