/usr/share/alsa/pcm/surround40.conf is in libasound2-data 1.0.27.2-3ubuntu7.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# Hardware output from 4.0 speakers.
# Samples must be positioned:
# chn0 - front left
# chn1 - front right
# chn2 - rear left
# chn3 - rear right
#
pcm.!surround40 {
@args [ CARD DEV ]
@args.CARD {
type string
default {
@func getenv
vars [
ALSA_SURROUND40_CARD
ALSA_PCM_CARD
ALSA_CARD
]
default {
@func refer
name defaults.pcm.surround40.card
}
}
}
@args.DEV {
type integer
default {
@func igetenv
vars [
ALSA_SURROUND40_DEVICE
]
default {
@func refer
name defaults.pcm.surround40.device
}
}
}
type empty
slave.pcm {
@func refer
name {
@func concat
strings [
"cards."
{
@func card_driver
card $CARD
}
".pcm.surround40." $DEV ":CARD=" $CARD
]
}
}
hint {
description "4.0 Surround output to Front and Rear speakers"
device $DEV
}
}
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