/etc/laptop-mode/conf.d/ac97-powersave.conf is in laptop-mode-tools 1.64-1ubuntu1.
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 Laptop Mode Tools module ac97-powersave.
#
# For more information, consult the laptop-mode.conf(8) manual page.
#
###############################################################################
# AC97 power saving settings
# ---------------------------
#
#__COMMENT If you enable this setting, laptop mode tools will automatically set the
#__COMMENT powersave mode of AC97 audio chipsets. This setting does not hurt, so
#__COMMENT there are no AC vs. battery settings: if CONTROL_AC97_POWER is set to 1,
#__COMMENT the powersave mode is always enabled.
#__COMMENT Set to 0 to disable.
#
###############################################################################
# Control AC97 audio chipset power?
CONTROL_AC97_POWER="auto"
# Enable debug mode for this module
# Set to 1 if you want to debug this module
DEBUG=0
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