RHEL's are RedHat Enterprise Linuxes; (plain) RedHat refers either to the company or to the
old RedHat operating systems (versions up to 9, after which came Fedora Core 1...6 and now Fedora 7 in the "non-commercial" side, and RHELs and such in the "commercial" side).
You can install a mixer manually, aumix is a nice app if you ask me. If you're using ALSA, there should be alsamixer as well (if not, you can install the ALSA packages using the RHEL update tool). After you've got a mixer program (you could already have), run it and see if there really are no devices at all. If that's the case, first see if you have a module you need to load to your kernel (because some sound "drivers" are compiled as modules):
If there's nothing that refers to your sound card (the internal one),
Code:
su
modprobe -l | grep snd | less
View the list and see (maybe with a web search) if any of the given modules would match your device (I think the word to grep is 'snd', not 'sound', but it could be just me). If yes, load it:
Code:
modprobe modulename_without_path_or_suffix
Then re-try with the mixer/some player app.
It could also be that the device is ok but it's muted; in that case review your mixer settings and remember to save them. For example using Alsamixer this means
If 'lsmod' doesn't show any modules matching your sound hardware, and neither can you find any with 'modprobe -l' (or you can't load any), it's possible (but would sound very strange) that your kernel doesn't contain working "drivers" for your hardware. This would mean a recompilation of the kernel, if such drivers existed, but I really don't believe that's the case.
You can learn more of your hardware with
and try to deduce what's going on..
