/etc/laptop-mode/conf.d/intel-hda-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 intel-hda-powersave.
#
# For more information, consult the laptop-mode.conf(8) manual page.
#
###############################################################################
# Intel HDA power saving settings
# -------------------------------
#
#__COMMENT Enable this setting to save some power with your Intel HDA Audio Chipset
#__COMMENT device.
#
###############################################################################
# Enable debug mode for this module
# Set to 1 if you want to debug this module
DEBUG=0
# Control INTEL HDA audio chipset power?
# Set to 0 to disable
CONTROL_INTEL_HDA_POWER="auto"
# Handle power savings for Intel HDA under specific circumstances
BATT_INTEL_HDA_POWERSAVE=1
LM_AC_INTEL_HDA_POWERSAVE=0
NOLM_AC_INTEL_HDA_POWERSAVE=0
# Number of seconds to wait before you want the device to time out
INTEL_HDA_DEVICE_TIMEOUT=2
# Disable controller on Device timeout
# This saves more power
# However you might want to disable this if you get annoyed by the
# "click" sound when the device wakes up again
#
# Set this to 1 to enable power savings for the controller also
INTEL_HDA_DEVICE_CONTROLLER=0
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