Is audio card detection predictable?

[leledumbo]

My system just got down due to electricity issue, now I lost my previously well setup audio. alsamixer shows "this device does not have any controls", vlc can't play any song, smplayer has no sound, etc. When I finally try "aplay -l" I find out that the order has changed:

**** List of PLAYBACK Hardware Devices ****
card 0: Loopback [Loopback], device 0: Loopback PCM [Loopback PCM]
  Subdevices: 8/8
  Subdevice #0: subdevice #0
  Subdevice #1: subdevice #1
  Subdevice #2: subdevice #2
  Subdevice #3: subdevice #3
  Subdevice #4: subdevice #4
  Subdevice #5: subdevice #5
  Subdevice #6: subdevice #6
  Subdevice #7: subdevice #7
card 0: Loopback [Loopback], device 1: Loopback PCM [Loopback PCM]
  Subdevices: 8/8
  Subdevice #0: subdevice #0
  Subdevice #1: subdevice #1
  Subdevice #2: subdevice #2
  Subdevice #3: subdevice #3
  Subdevice #4: subdevice #4
  Subdevice #5: subdevice #5
  Subdevice #6: subdevice #6
  Subdevice #7: subdevice #7
card 1: PCH [HDA Intel PCH], device 0: ALC892 Analog [ALC892 Analog]
  Subdevices: 0/1
  Subdevice #0: subdevice #0
card 1: PCH [HDA Intel PCH], device 1: ALC892 Digital [ALC892 Digital]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 2: NVidia [HDA NVidia], device 3: HDMI 0 [HDMI 0]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 2: NVidia [HDA NVidia], device 7: HDMI 0 [HDMI 0]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 2: NVidia [HDA NVidia], device 8: HDMI 0 [HDMI 0]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 2: NVidia [HDA NVidia], device 9: HDMI 0 [HDMI 0]
  Subdevices: 1/1
  Subdevice #0: subdevice #0

card 0 and card 1 have switched their places, making loopback device to be the default. Can I return the order back? Because I would need to reconfigure QJackCtl to use card 1 instead of default, calling alsamixer with "-c 1" parameter, and so on which is not the default.

[SteveRiley]

Do you have any of the following files anywhere on your computer:

* .asoundrc
* asound.conf
* alsa.conf
* asound.state

[leledumbo]

Do you have any of the following files anywhere on your computer:

* .asoundrc
* asound.conf
* alsa.conf
* asound.state

Yes:

leledumbo@Lelebuntu:~/Documents$ locate .asoundrc
/home/leledumbo/.asoundrc
leledumbo@Lelebuntu:~/Documents$ locate asound.conf
/usr/share/doc/libasound2-plugins/examples/asound.conf_jack
/usr/share/doc/libasound2-plugins/examples/asound.conf_oss
leledumbo@Lelebuntu:~/Documents$ locate alsa.conf
/usr/share/alsa/alsa.conf
/usr/share/alsa/alsa.conf.d
/usr/share/alsa/alsa.conf.d/50-pulseaudio.conf
/usr/share/alsa/alsa.conf.d/99-pulseaudio-default.conf.example
/usr/share/alsa/alsa.conf.d/README
/usr/share/alsa/alsa.conf.d/bluetooth.conf
leledumbo@Lelebuntu:~/Documents$ locate asound.state
/var/lib/alsa/asound.state
leledumbo@Lelebuntu:~/Documents$

I created .asoundrc to make it work with JACK, here's the content:

pcm.rawjack {
    type jack
    playback_ports {
        0 system:playback_1
        1 system:playback_2
    }
    capture_ports {
        0 system:capture_1
        1 system:capture_2
    }
}

pcm.jack {
    type plug
    slave { pcm "rawjack" }
    hint {
        description "JACK Audio Connection Kit"
    }
}

pcm.!default {
    type plug
    slave { pcm "rawjack" }
}

[SteveRiley]

I don't have any experience with JACK, so I'm not able to provide much advice. I have read in some places that there's no guarantee Udev will always arrange devices in the same order, and I wonder if you've now encountered this exact situation. Perhaps a bit of Googling around might find an answer. Wish I could be more helpful, sorry.

[leledumbo]

I have read in some places that there's no guarantee Udev will always arrange devices in the same order

Well, this is bad, but I guess I have to live with it. Anyway, it doesn't seem to happen so often. AFAIR, it happens due to some package upgrade. And I guess I would only need to adapt it with QJackCtl and alsamixer only, other applications seem to be unaffected. Thanks anyway.