On Sat, 2 May 2015 14:53:16 +0200, hollundertee@xxxxxxx wrote: >Thanks Ralf, I already have that: >$ cat /etc/modprobe.d/alsa-base.conf >options snd slots=snd_usb_audio,snd_hda_intel >options snd_usb_audio index=0 >options snd_hda_intel index=1 > >This way, the interface index is static, the question is: >How do I get: >if USB_device_is_present then > default := UA25 >else > default := PCH An insane solution: Perhaps write a script that at startup tests if the USB device is available. aplay -l | grep device_foo then checking the exit status by $? it is 1 if the device is not available and 0 if the device is available. Provide two alsa-base.conf 1. options snd slots=snd_usb_audio and 2. options snd slots=snd_hda_intel make /etc/modprobe.d/alsa-base.conf a link to one or the other config. Test if the link to the file is for the device that is available, if so do nothing, if not link to the other config and let the script execute shutdown -r now. It could take the time of 1 shutdown and 2 startups and isn't good for the HDDs, but on the quick I didn't found a way to restart alsa and taking care of a changed /etc/modprobe.d/alsa-base.conf. To be honest, I didn't read the alsa man pages, there might be a sane way to change the default device. _______________________________________________ Linux-audio-user mailing list Linux-audio-user@xxxxxxxxxxxxxxxxxxxx http://lists.linuxaudio.org/listinfo/linux-audio-user
