/lib/udev/rules.d/90-alsa-ucm.rules is in alsa-utils 1.0.27.2-1ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 | SUBSYSTEM!="sound", GOTO="sound_end"
ACTION!="change", GOTO="sound_end"
KERNEL!="card*", GOTO="sound_end"
ATTRS{id}=="PandaBoard", RUN+="/usr/bin/alsaucm -c PandaBoard set _verb HiFi"
ATTRS{id}=="PandaBoard", RUN+="/usr/bin/alsaucm -c PandaBoard set _verb Record"
ATTRS{id}=="PandaBoardES", RUN+="/usr/bin/alsaucm -c PandaBoardES set _verb HiFi"
ATTRS{id}=="PandaBoardES", RUN+="/usr/bin/alsaucm -c PandaBoardES set _verb Record"
ATTRS{id}=="SDP4430", RUN+="/usr/bin/alsaucm -c SDP4430 set _verb HiFi"
ATTRS{id}=="SDP4430", RUN+="/usr/bin/alsaucm -c SDP4430 set _verb Record"
ATTRS{id}=="tegraalc5632", RUN+="/usr/bin/alsaucm -c tegraalc5632"
ATTRS{id}=="DAISY-I2S", RUN+="/usr/bin/alsaucm -c DAISY-I2S set _verb HiFi"
LABEL="sound_end"
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