/etc/laptop-mode/conf.d/pcie-aspm.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 pcie-aspm
#
# For more information, consult the laptop-mode.conf(8) manual page.
#
###############################################################################
# PCIe Activate State Power Management enable/disable switch
# --------------------------------------------------------------------------
#
#__COMMENT If you enable this setting, laptop mode tools will automatically configure
#__COMMENT PCIe ASPM to save power while running on battery mode.
#__COMMENT
#__COMMENT This laptop mode module may require that the following kernel option is
#__COMMENT enabled:
#__COMMENT
#__COMMENT pcie_aspm=force
#
###############################################################################
# Enable debug mode for this module
# Set to 1 if you want to debug this module
DEBUG=0
# Control PCIe ASPM tunables?
# Set to 0 to disable
CONTROL_PCIE_ASPM="auto"
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