chgrp /dev/dsp to audio group, when?
 

Multiple users cannot play sound when logged on different X displays.

I found a solution to this using a group named audio ang executing the following:
But this works until one user does not log off and log in again. I found out that the X logon procedure changes the /dev/dsp permisions to back default 600.

How could I make the setting of 660'ed /dev/dsp persistent?
Could it be done without running a script every time some logs on?

If you're using FC3 or FC4 you've got udev so you'll need to edit the rules to set the group when the device file is created.

Look in /etc/udev/rules.d/50-udev.rules and you will see the line which controls /dev/dsp :

You should be able to change the default group ownership like this:

Make sure you back up the rules file first (probably to a sepparate directory so udev doesn't try to read both).

I'm sure that instead of altering 50.udev.rules you should create a local rules file but the above should work. If yum or up2date updates udev then I think you may loose the changes.

See man udev for more info.

Hope that helps

Paul