19 Mar
2008
19 Mar
'08
10:51 a.m.
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.
19 Mar
19 Mar
12:44 p.m.
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
2:35 p.m.
Al Thompson wrote:
> Hi all. I'm new here so I figured I'd introduce myself.
>
Hi.
<SNIP>
>
> 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?
>
In general, yes, but not so much by 'preventing' the mixer from being
the default device as much as making the built in sound card the
default.
This is a bit distro specific but where ever you set up your Alsa
modules you can set which sound card is considered the default. On my
system it looks like this:
alias snd-card-0 snd-intel8x0
options snd-intel8x0 index=0
alias snd-card-1 snd-hdsp
options snd-hdsp index=1
I presume that you probably have a driver for the internal device and
maybe USB-audio for the mixer. Just set the USB as 1 and the built in
as 0 and you should be good to go.
Hope this helps,
Mark
5:52 p.m.
Mark Knecht wrote:
In general, yes, but not so much by 'preventing' the mixer from being
the default device as much as making the built in sound card the
default.
This is a bit distro specific but where ever you set up your Alsa
modules you can set which sound card is considered the default. On my
system it looks like this:
alias snd-card-0 snd-intel8x0
options snd-intel8x0 index=0
alias snd-card-1 snd-hdsp
options snd-hdsp index=1
I presume that you probably have a driver for the internal device and
maybe USB-audio for the mixer. Just set the USB as 1 and the built in
as 0 and you should be good to go.
Hope this helps,
Mark
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Hi Mark,
what if you want to control the order of two different devices both usb
(and so both handled by the snd-usb-audio module? In particular I have
an usb audio interface and usb keyboard which is recognized as an audio
device (even if it doesn't have audio functionalities). The order
switches randomly at each reboot.
Thanks in advance,
-c.
Al Thompson
wrote:
Hi.
<SNIP>
Hi all. I'm new here so I figured I'd
introduce myself.
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?
6:25 p.m.
On Wed, Mar 19, 2008 at 1:52 PM, Cesare Marilungo
<cesare(a)poeticstudios.com> wrote:
Hi
Mark,
what if you want to control the order of two different devices both usb
(and so both handled by the snd-usb-audio module? In particular I have
an usb audio interface and usb keyboard which is recognized as an audio
device (even if it doesn't have audio functionalities). The order
switches randomly at each reboot.
Thanks in advance,
-c.
Hi Cesare,
Good to hear from you.
This was the subject of another thread I asked on (I think) this
list a week or two ago. Apparently there is no way to do this for
cards using identical drivers. I had an opportunity to put together a
machine using 3 HDSP9652's but I needed to know that order of the
cards and ensure that every time I booted that the order wouldn't
change. The response I got was that Alsa cannot handle this.
I did a little bit of study of how Windows does this for internal
cards. It appears that Windows pays attention to the resources the
device is using and keeps track of those. PCI bus and slot number. IRQ
assingment, etc. As loog as things don't change then it will comtinue
to use them the same way every day.
For external devices it seems that the best way to do this in Linux
is though udev. Most external devices have a UUID of some type. If you
can identify the UUID and then build a udev rule it should work but
that's all way beyond my skill set.
Hope this helps,
Mark
6:32 p.m.
On Wed, 2008-03-19 at 14:25 -0700, Mark Knecht wrote:
On Wed, Mar 19, 2008 at 1:52 PM, Cesare Marilungo
<cesare(a)poeticstudios.com> wrote:
Hi Mark,
what if you want to control the order of two different devices both usb
(and so both handled by the snd-usb-audio module? In particular I have
an usb audio interface and usb keyboard which is recognized as an audio
device (even if it doesn't have audio functionalities). The order
switches randomly at each reboot.
Thanks in advance,
-c.
Hi Cesare,
Good to hear from you.
This was the subject of another thread I asked on (I think) this
list a week or two ago. Apparently there is no way to do this for
cards using identical drivers.
You missed the conclusion then.
Two PCI cards are in different slots, and this information is available
to udev.
Cesare's problem is easily solvable with the old vendor/product ID stuff
as arguments to the ALSA module, as documented in many threads here.
--p
6:43 p.m.
Paul Davis wrote:
On Wed, 2008-03-19 at 14:25 -0700, Mark Knecht wrote:
Yep, found:
http://alsa.opensrc.org/index.php/MultipleUSBAudioDevices
Sorry for the noise. :-[
-c.
On Wed, Mar 19, 2008 at 1:52 PM, Cesare
Marilungo
<cesare(a)poeticstudios.com> wrote:
Hi Mark,
what if you want to control the order of two different devices both usb
(and so both handled by the snd-usb-audio module? In particular I have
an usb audio interface and usb keyboard which is recognized as an audio
device (even if it doesn't have audio functionalities). The order
switches randomly at each reboot.
Thanks in advance,
-c.
Hi Cesare,
Good to hear from you.
This was the subject of another thread I asked on (I think) this
list a week or two ago. Apparently there is no way to do this for
cards using identical drivers.
You missed the conclusion then.
Two PCI cards are in different slots, and this information is available
to udev.
Cesare's problem is easily solvable with the old vendor/product ID stuff
as arguments to the ALSA module, as documented in many threads here.
--p
6:38 p.m.
Mark Knecht wrote:
On Wed, Mar 19, 2008 at 1:52 PM, Cesare Marilungo
<cesare(a)poeticstudios.com> wrote:
Hi Mark,
what if you want to control the order of two different devices both usb
(and so both handled by the snd-usb-audio module? In particular I have
an usb audio interface and usb keyboard which is recognized as an audio
device (even if it doesn't have audio functionalities). The order
switches randomly at each reboot.
Thanks in advance,
-c.
Hi Cesare,
Good to hear from you.
This was the subject of another thread I asked on (I think) this
list a week or two ago. Apparently there is no way to do this for
cards using identical drivers. I had an opportunity to put together a
machine using 3 HDSP9652's but I needed to know that order of the
cards and ensure that every time I booted that the order wouldn't
change. The response I got was that Alsa cannot handle this.
Yes, I remember that thread. But I thought my case would be addressable
since the device are, at least, different. I also thought it should be
quite common to have both an usb audio interface and an usb midi keyboard.
I did a little bit of study of how Windows does
this for internal
cards. It appears that Windows pays attention to the resources the
device is using and keeps track of those. PCI bus and slot number. IRQ
assingment, etc. As loog as things don't change then it will comtinue
to use them the same way every day.
For external devices it seems that the best way to do this in Linux
is though udev. Most external devices have a UUID of some type. If you
can identify the UUID and then build a udev rule it should work but
that's all way beyond my skill set.
I'll try this. Thanks.
Hope this helps,
Mark
All the best,
-c.
7:34 p.m.
On Wednesday 19 March 2008 21:52, Cesare Marilungo wrote:
Mark Knecht wrote:
Hi Mark,
what if you want to control the order of two different devices both usb
(and so both handled by the snd-usb-audio module? In particular I have
an usb audio interface and usb keyboard which is recognized as an audio
device (even if it doesn't have audio functionalities). The order
switches randomly at each reboot.
Thanks in advance,
-c.
Hi Cesare. Searching through my various mailbox's, I found this posted by
Clemens Ladisch (alsa developer).
<quote>
This alone doesn't work when multiple devices are handled by the same driver.
The snd-usb-audio has a "pid" parameter to specify that a device with a
certain product ID should go to a specifc index. For example,
options snd-usb-audio index=1,2 pid=0x1234,0x5678
would force the device with product ID 1234 to come first.
Vendor and product IDs can be listed with lsusb.
<end quote>
Obviously you need to change the pid's to your actual pid's for your usb
devices, then the usb devices should always be loaded in the same order.
All the best.
Nigel.
Al
Thompson wrote:
> Hi all. I'm new here so I figured I'd introduce myself.
Hi.
<SNIP>
> 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?
In general, yes, but not so much by 'preventing' the mixer from being
the default device as much as making the built in sound card the
default.
This is a bit distro specific but where ever you set up your Alsa
modules you can set which sound card is considered the default. On my
system it looks like this:
alias snd-card-0 snd-intel8x0
options snd-intel8x0 index=0
alias snd-card-1 snd-hdsp
options snd-hdsp index=1
I presume that you probably have a driver for the internal device and
maybe USB-audio for the mixer. Just set the USB as 1 and the built in
as 0 and you should be good to go.
Hope this helps,
Mark
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8 comments
6 participants
participants (6)
-
Al Thompson -
Cesare Marilungo -
Frank Pirrone -
Mark Knecht -
Nigel Henry -
Paul Davis