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Old 10-20-2004, 02:22 PM   #1
boggins
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Registered: Oct 2004
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which device for which hardware


System is Red Hat Linux 9, kernel 2.4.20-8.

The PC has an onboard AC'97 codec and an outboard USB audio device. Given that I will have two /dev/dsp* entries, how do I figure out which hardware device each is referring to?

As I understand it, the "first" device will end up being minor number 3; the "second" device ending up with minor number 19. That's all fine and good, except how do I know whether the USB audio device was the "first" or the onboard card was the "first"?

I'm making an assumpting there is some ioctl() which will return information I can use, but I'm not sure what that might be. (Maybe even figuring out which driver is controlling a specific device...I can certainly figure it out from there.)

Anyway, that's my situation. Any advice?

Thanks!


Paul Braman
nitewave at tampabay dot rr dot com
 
Old 10-21-2004, 08:38 AM   #2
ilikejam
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Registered: Aug 2003
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Hi.

Check the output from 'dmesg' or /var/log/messages.

The kernel lists which cards have been assigned to which devices as it boots (or as the devices are added).

Dave
 
  


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