Using alsamixer/amixer after selecting a non-default sound card (System> Preferences> Sound> Default sound card) results in errors

[Daniel T Chen]

debian/patches/23_default_soundcard_selector.patch needs to be modified to set defaults.ctl.card in addition to defaults.pcm.card in ~/.asoundrc.asoundconf after the user selects a non-default sound card using the System> Preferences> Sound> Default sound card menu. Otherwise, the following error occurs when using alsamixer (or amixer) from the command line:

ALSA lib confmisc.c:1107:(snd_func_refer) Unable to find definition 'defaults.ctl.card'
ALSA lib conf.c:3493:(_snd_config_evaluate) function snd_func_refer returned error: No such file or directory
ALSA lib confmisc.c:242:(snd_func_getenv) error evaluating default
ALSA lib conf.c:3493:(_snd_config_evaluate) function snd_func_getenv returned error: No such file or directory
ALSA lib conf.c:3962:(snd_config_expand) Evaluate error: No such file or directory
ALSA lib control.c:817:(snd_ctl_open_noupdate) Invalid CTL default
amixer: Mixer attach default error: No such file or directory

[Martin Pitt (pitti)]

Confirming, need to set defaults.ctl.card as well.

[Martin Pitt (pitti)]

A similar change needs to be done in g-v-m.

[Martin Pitt (pitti)]

 control-center (1:2.14.1-0ubuntu3) dapper; urgency=low
 .
   * debian/patches/23_default_soundcard_selector.patch:
     - Set defaults.ctl.card in addition to defaults.pcm.card. Closes: LP#35540
     - Factor out asoundconf calls into a separate function set_default_card().
     - Fix some compiler warnings.

[Martin Pitt (pitti)]

 gnome-volume-manager (1.5.15-0ubuntu5) dapper; urgency=low
 .
   * debian/patches/91_ubuntu-remove_default_audio_dev.patch:
     - If the default audio device is removed, just remove the default setting
       from the ALSA configuration instead of setting it to 0 (asoundconf now
       provides the 'delete' command for this).
     - Reset defaults.ctl.card, too. Closes: LP#35540
     - gvm_delete_alsa_playback(): Cope with default cards being specified by
       name.

[Toby Smithe (tsmithe)]

yeah. this is incredibly annoying.