This file is indexed.

/usr/share/alsa-base/alsa.default is in alsa-base 1.0.25+dfsg-0ubuntu5.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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# Configuration file for alsa-base

# List, separated by spaces, the names of modules that should be
# unloaded, if present, before the machine is suspended. Use the
# special name "all" if you would like all ALSA sound modules to be
# removed. The modules that are removed will be loaded again after
# resume.  Currently this only has an effect if you are using apmd.
# Examples:
#     Value         Action at suspend time
#     ""            Do nothing
#     "snd-cs46xx"  Stop sound processes and remove the snd-cs46xx module
#     "all"         Stop sound processes and remove all ALSA modules
force_unload_modules_before_suspend=""