Al Thompson wrote:
> Hi all. I'm new here so I figured I'd introduce myself.
>
> I'm using fully upgraded Fedora Core 7 (Kernel 2.6.23.15-80) on a
> 2.4GHz Intel P4 in a Compaq which has a sound card integrated on the
> motherboard. lscpi reports it as being an 'Intel 82801DB/DBL/DBM
> AC'97 Audio Controller.' Which works fine.
>
> However, I dual boot XP, for which I sometimes have a USB I/O audio
> device (Alesis Multimix) connected. If I happen to forget to
> disconnect the mixer before I boot into Linux, the mixer is made the
> default audio device, and all reference to my internal sound card is
> removed. If I shut down, remove the USB mixer, and reboot, there is
> NO sound card available. If I run 'system-config-soundcard' I can get
> it to work again after clicking on 'autodetect', even though that is
> what it was already set at. Even then, Under the "PCM Devices" boxes,
> there are none available. Even without a PCM device available, I can
> play .wav files, so I guess I don't understand what the PCM output
> device does.
>
> Is there a way to prevent the mixer from being made the default (and
> only) audio device if I happen to mistakenly leave it connected? And
> what happened to my PCM devices?
>
> I searched fairly extensively, but all the things I found had to do
> with sound cards not working at all. Oddly enough, the mixer worked
> flawlessly under Linux the first time and was easier to configure than
> it was under XP. I just want the configuration to revert to the
> internal sound card after I unplug the mixer.
>
> Any help on this?? I've only been using Linux (this time) for about 5
> months, and I guess I'm just not understanding what program is
> changing this, or why.
> ------------------------------------------------------------------------
Welcome Al.
Not sure what you searched for and I haven't used FC since v.3, but
there was a hotplug blacklist under /etc where modules could be listed
to prevent loading. Doing so had no effect on other devices or services
other than those dependent upon that mod.
You might search for hotplug, blacklist and devfs with a search phrase
designed to hit blocking devices from being activated. Otherwise, hang
on for a moment and I'm sure that more experienced advice will come
streaming in.
Frank
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Received on Thu Mar 20 00:15:02 2008
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