[alsa-devel] amixer cget :Assertion `ctl && info && (info->id.name[0] || info->id.numid)' failed. Aborted

[Raymond Yau]

There is assertion when specify iface=PCM  or iface=PCM,name='' when
using amixer -c0 cget

according to the synthax

[[iface=<iface>,][name='name',][index=<index>,][device=<device>,][subdevice=<subdevice>]]|[numid=<numid>]


amixer -c0 cget iface=PCM
amixer: control.c:258: snd_ctl_elem_info: Assertion `ctl && info &&
(info->id.name[0] || info->id.numid)' failed.
Aborted

amixer -c0 cget iface=PCM,name=''
amixer: control.c:258: snd_ctl_elem_info: Assertion `ctl && info &&
(info->id.name[0] || info->id.numid)' failed.
Aborted

amixer -c0 cget
Specify a full control identifier:
[[iface=<iface>,][name='name',][index=<index>,][device=<device>,][subdevice=<subdevice>]]|[numid=<numid>]


amixer -c0 cget iface=PCM,name='ILD'
amixer: Cannot find the given element from control hw:0

amixer -c0 cget iface=PCM,name='ILD',device=2
numid=45,iface=PCM,name='ILD',device=2
  ; type=INTEGER,access=rw------,values=2,min=0,max=2147483647,step=0
  : values=0,0