init/powerd.conf

# Copyright (c) 2012 The Chromium OS Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

description   "Start the Chromium OS power daemon"
author        "chromium-os-dev@chromium.org"

# Note, the 'start on' line is modified by chromeos-factoryinstall ebuild.
# Please do not change it without also changing that reference.
start on started boot-services
stop on stopping boot-services
respawn
respawn limit 3 10  # if the job respawns 3 times in 10 seconds, stop trying.

env LOG_DIR=/var/log/power_manager
env POWER_RUN_DIR=/var/run/power_manager/power
env PREFS_DIR=/var/lib/power_manager
env ROOT_RUN_DIR=/var/run/power_manager/root
env ROOT_SPOOL_DIR=/var/spool/power_manager/root
env DEFAULT_PREFS_DIR=/usr/share/power_manager
env VMODULE_ARG=state_controller=1,*backlight_controller=1,ambient_light_handler=1

pre-start script
  mkdir -p ${LOG_DIR} ${POWER_RUN_DIR} ${PREFS_DIR}
  chown -R power:power ${LOG_DIR} ${POWER_RUN_DIR} ${PREFS_DIR}
  chmod 755 ${LOG_DIR} ${POWER_RUN_DIR} ${PREFS_DIR}

  mkdir -p ${ROOT_RUN_DIR} ${ROOT_SPOOL_DIR}

  # Change ownership of screen/keyboard backlight and wakeup files.
  for FILE in \
      /proc/acpi/wakeup \
      /sys/class/backlight/*/* \
      /sys/class/leds/*:kbd_backlight/* \
      $(find /sys/devices/ -name "dark_resume_active") \
      $(find /sys/devices/ -name "dark_resume_source"); do
    # Test for existence to skip over wildcards that didn't match anything.
    if [ -e "${FILE}" ]; then
      chown power:power "${FILE}" || true
    fi
  done
end script

# Note that we need the full path to powerd because minijail doesn't look
# at $PATH.  Also, do not set capabilities here using minijail0's -c flag;
# doing so will prevent powerd_setuid_helper from running correctly when
# executed by powerd.
exec minijail0 -u power -g power -G --        \
  /usr/bin/powerd                             \
    --prefs_dir=${PREFS_DIR}                  \
    --default_prefs_dir=${DEFAULT_PREFS_DIR}  \
    --log_dir=${LOG_DIR}                      \
    --run_dir=${POWER_RUN_DIR}                \
    --vmodule="${VMODULE_ARG}"                \
    >/var/log/powerd.out 2>&1