/etc/laptop-mode/conf.d/hal-polling.conf is in laptop-mode-tools 1.60-1ubuntu1.
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 hal-polling.
#
# For more information, consult the laptop-mode.conf(8) manual page.
#
###############################################################################
# HAL polling settings
# --------------------
#
# If you enable this module, laptop mode tools will control the polling of
# your CD/DVD drives by HAL. Disabling polling saves a considerable amount of
# power, but for some older CD/DVD drives it means that inserted CDs are no
# longer autodetected. In such cases, you must turn this option off.
# Alternatively, you can configure laptop mode tools to turn HAL polling on only
# when the laptop is running on AC power. This would mean that CDs are not
# autodetected while the laptop is running on battery power, but the power
# savings may be worth the extra manual labour when you insert a CD.
#
###############################################################################
# Enable debug mode for this module
# Set to 1 if you want to debug this module
DEBUG=0
# Control HAL polling?
# Set to 0 to disable.
CONTROL_HAL_POLLING="auto"
# Disable HAL polling on battery?
BATT_DISABLE_HAL_POLLING=1
# Disable HAL polling on AC?
AC_DISABLE_HAL_POLLING=0
# Drives to apply HAL polling settings to
HAL_POLLING_DEVICES="/dev/scd?"
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