If you're attempting to play an audio CD, ignore the
fstab(5) file, it's totally irrelevant in this situation.
OpenBSD's
cdio(1) program supports two methods of playing audio CD's.
- play issues a command to the firmware of the CD-ROM which has it's own native ability to play audio CD's, it requires a small 3 wire cable between the drive and the soundcard, this may or may not be connected in a laptop but the drive firmware may still spin up and appear to be playing the disk, it's also possible the input isn't selected in mixerct(1).
- cdplay digitally extracts the audio from the disk and uses the sndio(7) library to send the audio data to a listening aucat(1) daemon or directly to an audio(4) device.
Now, in a previous topic you posted your dmesg.. your laptop has one of the
azalia(4) devices, these are notoriously complex and it's difficult to pick a default configuration that will work for all cards.
The author of the driver quite frequently deals with people posting to the lists with problems.. so in the 4.8 release the man page has been updated to help end users configure their cards properly, this process is largely
trail and error and it's going to take some fiddling with
mixerctl(1) to get things working on your system.
If you wish, you can try posting the output of that program here and maybe someone would be willing to help you.. but it's going to require that you be patient, again, these cards are much more sophisticated than most of the audio drivers supported by OpenBSD (..and hence why the FAQ wasn't able to help you).
Good luck,