Ok, that's the content of the info structure passed to the failing
snd_ctl_hw_elem_info() call:

$1 = {id = {numid = 21, iface = 2, device = 0, subdevice = 0, 
    name = "Master Playback Volume", '\0' <repeats 21 times>, index = 0}, type 
= 0, access = 0, 
  count = 0, owner = 0, value = {integer = {min = 0, max = 0, step = 0}, 
integer64 = {min = 0, 
      max = 0, step = 0}, enumerated = {items = 0, item = 0, name = '\0' 
<repeats 63 times>}, 
    reserved = '\0' <repeats 127 times>}, dimen = {d = {0, 0, 0, 0}, d_ptr = 
0x0}, 
  reserved = '\0' <repeats 55 times>}

Seems SNDRV_CTL_IOCTL_ELEM_LIST reports existance of a "Master Playback
Volume" channel, but SNDRV_CTL_IOCTL_ELEM_INFO cannot retreive the
details.

-- 
Alsa mixer doesn't work anymore with Realtek ALC861
https://bugs.launchpad.net/bugs/241379
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