I guess this is a common problem but I can't seem to find the solution . I followed this thread and played with cable from the tuner card to the motherboard but it didn't work. This thread shows success with modprobing bttv with the right parameters. I also got the right parameters for my card but still there's no sound.

My card is CEI Raffles rev 3. dmesg shows correct detection
except for the 4 lines showing "i2c ... not found" . Does anybody know if that's significant?

I'm sure the cable from the tuner card 's Aux-out to the motherboard's CD-IN is working since I can hear music from the tuner's line-in port. Now, that's something I haven't seen in any post. The speaker can pick up sound from the tuner's card's line-in, through the tuner card's Aux-Out but not from within the tuner card.

I'm suspecting this might have to do with the tuner card seems to likes OSS instead of ALSA since I got an error from tvtime saying
However, after loading snd-mixer-oss and snd-pcm-oss, tvtime doesn't complain anymore. I can use left/right button to change volume bar but still there's no sound

I have spent well over 20 hours on this issue and I would appreciate any suggestions. Thanks.

I have a cheap TV tuner card (Mercury something or other that uses a Conexant chipset), and the only way I get sound from the internal aux port only if I have a headphone volume controller attached to the line out cable on the "octopus" (the multi-cable thing that has various audio and video connections), and the volume is inversely proportional to the level on the controller (the lower the volume on the controller, the higher the volume from the aux port).

The i2c messages just mean that those particular i2c chips aren't on your card, which likely isn't an issue.

Thanks for the quick reply ciotog! That's a good idea. I would have some trouble carrying out though since I don't have its manual. Mine is also a cheap old tuner card.

What's the pinout of your "octopus"? I hope the 3 pins are close such that I can use a 4 pin connector. Otherwise I will have to buy a "female octopus".

I don't understand your use of headphone controller. Is it possible just to run a cable from that "octopus" on the tuner card straight to CD-IN port on the motherboard? and let alsamixer control the volume?

The octopus I have has 9 pins, and came with the tuner card. I don't imagine a different one would likely work, as it will have been engineered for this device (and possibly other tv-tuner cards by the same manufacturer).

I stumbled across the volume control "fix" by accident, I was trying to get it to play through headphones and happened to notice that the aux port started producing sound only when the volume controller was turned down to the lowest level. I'm sure running a cable to the 1/8" line-in connection would work, if you wanted to do some wire work I'm sure you could connect it to the motherboard header.

Either way the video and audio quality is so low that I abandoned working with it until I can get a decent tuner card

You're right ciotog. The connector on my tuner is different. It's a 10-pin dual-in-line. It seems like I'm out of luck then. I might have to abandon it myself Thanks for sharing your experience.

It turned out this problem has been solved in this thread. Typing:
and voila!

Good to hear! So how's the quality?

Sorry for the late reply, ciotog. I haven't checked my messages for a while. The sound quality is quite good, actually. I'm quite happy. Actually I used the card for MythTV and I don't have any problem with sound.