This may sound silly but can your serial adapter be plugged in backwards? Most of the adapters I've had will only go one way as one of the holes is blocked, but I also have one that can be connected both ways but of course only one way works.

Also do you have any other serial adapters to try? I managed to damage one of mine when I closed the case on the cable, breaking one of the wires.

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Paul Turpie
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<--Is your location in your profile? Why not?

I bought two of the same when I bought them. You can plug them in both ways, and I originally tried it both ways. I then, however, used a meter to verify that pin1 on the serial port was going into what was labeled as pin1 on the motherboard. So, unless the motherboard documentation is wrong, it should be connected correctly. I haven't closed the case since I started testing, so I don't think the cable is damaged.

This is what I get:

(I'm not seeing any driver info here... Is this potentially my problem?)

I've been searching through lirc_serial posts , I haven't found anything promising, yet...

here's a simplified version of of lsmod, too:


Also, if this helps:

For the /dev directory do:


BTW - Have you tried pointing your DEVICE to that /dev/lirc1?

Yeah, I mentioned earlier that I tried setting

in hardware.conf and it didn't appear to make a difference.

At this point, is it possible I just have a bad serial port, or is there any way I can verify that the port is good and I just have a configuration issue?

There are 2 different pinouts for the DB9 (COM) headers on motherboards - Intel and DTK, I believe. Be sure you have the correct pinout for your motherboard's COM header. This page has links and descriptions http://hardware.mcse.ms/archive69-2005-4-177089.html

Also, is it enabled in the BIOS?

Yeah, I checked that about 24 times . I even tried different IRQs (and set them as such using setserial). When the computer is booting I see it detecting the com port, and in dmesg:



I used a multimeter to make sure, pin 1 goes to pin 1.

That's good, at least the port is recognized.

Yeah, both of those pinouts have 1 -> 1. The correct combination will depend on your motherboard manufacturer's standard, either Intel or DTK.

Of course, it may be possible that the port is bad...

I just went off the diagram in the mobo manual. It has the pins numbered and labeled by function.


That's what I'm afraid of, I wish there was some way for me to test it...

okay, after trying a few more motherboards I finally realized my problem... It was the cable

I thought I had ohmed it out properly before, but apparently I did not. I know I made sure pin 1 pointed to pin 1, but I didn't realize that both of those cable configurations had pin 1 connect to pin 1.

Sorry I gave everyone the run around, I was being stupid...

Thanks for all your help and suggestions, though. And in the end, I ended up with a better processor and mobo anyway. (AMD 3800+ X2 and an ASUS M2NPV-VM)

(Special thanks to slowtolearn and tjc, you guys rock. slow helped me realize my problem, and tjc always seems to be the one answering my posts...)