/usr/share/pulseaudio/alsa-mixer/profile-sets/tegra-nexus7.conf is in ubuntu-defaults-nexus7 0.54.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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auto-profiles = yes
[Mapping analog-stereo]
device-strings = front:%f hw:%f plughw:%f
channel-map = left,right
paths-output = tegra-nexus7-speaker tegra-nexus7-headphone
paths-input = tegra-nexus7-intmic
priority = 10
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