[LAU] Alsa setup question

Hi there, I didn't have access to the LA-lists for a number of months now, and the list admin was not helpful. I subscribed with this crappy mail provider now and hope that it will work. Sorry for advertisement and other crap that might go along with it. I do have some trouble setting up alsa the way I want it. The machine is a laptop that I carry around and use at home. What I want to have: 1) If on the road, the internal card (PCH) should be the default. 2) If at home, the usb card (UA25) should be the default. I had this working rather reliably at some point, but it doesn't work anymore. I have the following in /etc/modprobe.d/alsa-base.conf to prevent race conditions on boot: options snd slots=snd_usb_audio,snd_hda_intel options snd_usb_audio index=0 options snd_hda_intel index=1 However, I experience weird things with /etc/asound.conf, it gets overwritten on every boot with garbage. This is what it looks like when I boot without external interface: defaults.ctl.card 1 defaults.pcm.card 1 defaults.pcm.card 1 defaults.pcm.card 1 defaults.pcm.card 1 defaults.pcm.card 1 When the external interface is plugged in on boot, it looks somewhat like this (off the top of my head): defaults.ctl.card 0 defaults.pcm.card 1 defaults.ctl.card 1 defaults.pcm.card 0 defaults.pcm.card 1 defaults.pcm.card 1 defaults.pcm.card 1 defaults.pcm.card 1 Obviously total garbage, and I have no idea what service tries to be smart here. Any ideas? At least ~/.asoundrc does not get overwritten. Also, is there a reliable way to do what I want? Right now I have this in my ~/.asoundrc, but it does not do what I want. I suspected that alsa would set the only device actually there as default, but it does not, so with this setup I have no sound on the road: defaults.ctl.card 0 defaults.pcm.card 0 Thanks in advance for your help. Regards, hollunder