/etc/laptop-mode/conf.d/sched-smt-power-savings.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 sched-smt-power-savings
#
# For more information, consult the laptop-mode.conf(8) manual page.
#
###############################################################################
# SMT multi-threaded power-saving tunables for the process scheduler
# --------------------------------------------------------------------------
#
#__COMMENT If you enable this setting, laptop mode tools will automatically configure the
#__COMMENT Linux scheduler to save power on SMT processors while running on
#__COMMENT battery mode.
#
###############################################################################
# Enable debug mode for this module
# Set to 1 if you want to debug this module
DEBUG=0
# Control multi-core power-saving tunables for the process scheduler?
# Set to 0 to disable
CONTROL_SCHED_SMT_POWER_SAVINGS="auto"
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