Hi all !

I have the RedHat Linux and Win2000 install3ed on my machine (dual boot). I have no problems listening to CDs under Win2000.
When I try to do it under Linux, Cd player apperas working but I have no sound in headset.

When I attempt to invoke volume control, I have the following message

"Invalid /dev/mixer device"
"unable to open audio device "dev/mixer"
Please check that you have permission to open /dev/mixer
and that you have sound support in your kernel"

My /dev/mixer/ permissions are "crw-------". I try to change it but it didnn't solve the problem. My linux is a standard ReHat 9 installation.

help will be much appreciated

did you try changing as root:
chmod 660 /dev/mixer ?

It didn't help. I've tried chmod 660 /dev/mixer before I posted and just to be sure I've just tried it again now, but I still can't open volume Controls

try:
chmod 660 /dev/dsp* /dev/mixer* /dev/audio*

Just did it. Same Error

ok lets ask the question that should of been asked before we went through these couple of steps...
is the sound card installed?
what card do you have?
is the correct module loaded?

Hi !

I've just run sound card detector and it didn't found a sound card. The card is obviously there since I can play Cds on the same machine under Win2000.

Should I do any additional step so the sound card will be recognized ?

well since its not installed, then you obviously see now what you have to do, so lets start with the sound card that you do have?

Hi !

The problem has been solved by installing an additional sound card which is recognized and supported by Linux. The original souncard integrated to motherboard for some reason wasn't recognized by Linux. I don't know if it was possible to recognize an original sound card using some tricks and tweaks, but the new one is OK with both OS

Thanks a lot for your help

no problem, as long as that in the end you got sound :P