Dual Sound Cards - Revision history

Mcefan at 21:40, 19 October 2012

2012-10-19T21:40:54Z

←Older revision		Revision as of 21:40, 19 October 2012
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	[[Category: Audio]]		[[Category: Audio\| ]]
	If you have multiple soundcards (like an onboard and an external one), you might have had the problem that the wrong one is the default soundcard.		If you have multiple soundcards (like an onboard and an external one), you might have had the problem that the wrong one is the default soundcard.
	This is because the kernel module for the "wrong" card is loaded first, and if no option is passed when loading the module it gets the first available card number (0).		This is because the kernel module for the "wrong" card is loaded first, and if no option is passed when loading the module it gets the first available card number (0).

RayBe at 22:50, 25 February 2011

2011-02-25T22:50:55Z

←Older revision		Revision as of 22:50, 25 February 2011
Line 1:		Line 1:
			[[Category: Audio]]
	If you have multiple soundcards (like an onboard and an external one), you might have had the problem that the wrong one is the default soundcard.		If you have multiple soundcards (like an onboard and an external one), you might have had the problem that the wrong one is the default soundcard.
	This is because the kernel module for the "wrong" card is loaded first, and if no option is passed when loading the module it gets the first available card number (0).		This is because the kernel module for the "wrong" card is loaded first, and if no option is passed when loading the module it gets the first available card number (0).

RayBe at 22:45, 25 February 2011

2011-02-25T22:45:27Z

←Older revision		Revision as of 22:45, 25 February 2011
Line 1:		Line 1:
	If you have multiple soundcards (like an onboard and an external one), you might have had the problem that the wrong one is the default soundcard. This is because the kernel module for the "wrong" card is loaded first, and if no option is passed when loading the module it gets the first available card number (0).		If you have multiple soundcards (like an onboard and an external one), you might have had the problem that the wrong one is the default soundcard.
			This is because the kernel module for the "wrong" card is loaded first, and if no option is passed when loading the module it gets the first available card number (0).

	If they both use a different kernel module you can easily make sure the right one is the default card.		If they both use a different kernel module you can easily make sure the right one is the default card.

	Find out what module is being used for your soundcards:		Find out what module is being used for your soundcards:
	~~Code:~~		cat /proc/asound/modules
	cat /proc/asound/modules

	On my computer this could give		On my computer this could give:
	~~Code~~:		0 snd_usb_audio
	0 snd_usb_audio		1 snd_es1968
	1 snd_es1968
	This means that the card that's currently the default soundcard (card 0) uses the snd_usb_audio module.		This means that the card that's currently the default soundcard (card 0) uses the snd_usb_audio module.

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	You can't "reserve" card 0 for a particular module, because the options for a module are only passed when the module is loaded, and the whole problem was that the wrong module is loaded first. So, to make sure the right soundcard is default, we have to make sure the other one becomes card 1 when the module for it is loaded. This can be done by adding 1 simple line to /etc/modprobe.d/sound:		You can't "reserve" card 0 for a particular module, because the options for a module are only passed when the module is loaded, and the whole problem was that the wrong module is loaded first. So, to make sure the right soundcard is default, we have to make sure the other one becomes card 1 when the module for it is loaded. This can be done by adding 1 simple line to /etc/modprobe.d/sound:
	~~Code:~~		options name_of_offending_module index=1
	options name_of_offending_module index=1

	So, in my case this would be		So, in my case this would be
	~~Code:~~		options snd_usb_audio index=1
	options snd_usb_audio index=1

	Reboot and try!		Reboot and try!

RayBe: New page: If you have multiple soundcards (like an onboard and an external one), you might have had the problem that the wrong one is the default soundcard. This is because the kernel module for the...

2011-02-25T22:40:23Z

New page: If you have multiple soundcards (like an onboard and an external one), you might have had the problem that the wrong one is the default soundcard. This is because the kernel module for the...

New page

If you have multiple soundcards (like an onboard and an external one), you might have had the problem that the wrong one is the default soundcard. This is because the kernel module for the "wrong" card is loaded first, and if no option is passed when loading the module it gets the first available card number (0).

If they both use a different kernel module you can easily make sure the right one is the default card.

Find out what module is being used for your soundcards:
Code:
cat /proc/asound/modules

On my computer this could give
Code:
0 snd_usb_audio
1 snd_es1968
This means that the card that's currently the default soundcard (card 0) uses the snd_usb_audio module.

This is my EMI M4U, a device that's just capable of sending and receiving midi signals, not audio. So when I try to play sound I get an error. So I want the other one to be default.

You can't "reserve" card 0 for a particular module, because the options for a module are only passed when the module is loaded, and the whole problem was that the wrong module is loaded first. So, to make sure the right soundcard is default, we have to make sure the other one becomes card 1 when the module for it is loaded. This can be done by adding 1 simple line to /etc/modprobe.d/sound:
Code:
options name_of_offending_module index=1

So, in my case this would be
Code:
options snd_usb_audio index=1

Reboot and try!

Source: http://forum.vectorlinux.com/index.php?topic=4888.0