for the watts

dependencies

bash
udev
hdparm
iw

configuration

The config file is located at /etc/conf.d/ftw.

universal options

PROFILE_FILE

File to which the current profile name will be written after the profile is called.

MODULES

Array of modules to be removed when offline and inserted when online.

PARTITIONS

Device partitions affected by REMOUNT_OPTIONS.

DEVICES

Devices affected by BLOCKDEV_READAHEAD, HD_POWER_MANAGEMENT, and HD_SPINDOWN_TIMEOUT.

state-dependent options

CPUFREQ_GOVERNOR

CPU power scheme governor.

NMI_WATCHDOG

Execute periodic NMI interrupts to monitor CPU lock ups?

BUS_CONTROL

Control everything in /sys/bus/*/devices/*.
on means device should be resumed and autosuspend is not allowed.
auto means device is allowed to autosuspend and autoresume.

USB_AUTOSUSPEND_TIMEOUT

How long to wait before suspending USB devices.

PCIE_ASPM_POLICY

PCI Express Active State Power Management.
Will probably require pcie_aspm=force kernel boot parameter.

LAPTOP_MODE

Attempt to maximize the amount of time disks spend in a low power state by submitting all future pending disk IO when performing an IO operation?

DIRTY_RATIO

Maximum percentage of memory dirty pages can occupy before processes are forced to write dirty buffers themselves.

DIRTY_BACKGROUND_RATIO

Maximum percentage of memory dirty pages can occupy before pdflush begins to write them.

DIRTY_EXPIRE_CENTISECS

How long data can be in the page cache before it expires, signifying it must be written at the next opportunity.

DIRTY_WRITEBACK_CENTISECS

How often pdflush wakes up to write data to disk.

SCSI_HOST_POLICY

Policy for SCSI host adapters.

REMOUNT_OPTIONS

Comma-separated list (option1,option2,etc) of mount options to be applied when remounting devices.

BLOCKDEV_READAHEAD

Block device readahead in kilobytes.

HD_POWER_MANAGEMENT

Hard drive Advanced Power Management.
See hdparm(8) (-B flag section) for more information.

HD_SPINDOWN_TIMEOUT

How long to wait after disk activity stops before turning off hard drive's spindle motor.
See hdparm(8) (-S flag section) for more information.

SND_INTEL_POWER_SAVE

Enable Intel HDA audio chipset power saving?

SND_AC97_POWER_SAVE

Enable AC97 audio chipset power saving?

WIRELESS_POWER_SAVE

Enable wireless adapter power saving?

BACKLIGHT_BRIGHTNESS

Dim backlight to save power?
For max value (min is 0), check /sys/class/backlight/acpi_video*/max_brightness.

custom profiles

Custom profiles added to the config file can be called with ftw profile.

custom commands

Custom commands added to profile definitions will be executed when the profile is called.

examples

Disable Wake-on-LAN on battery with ethtool:

bat() {
    ethtool -s eth0 wol d
}

adp() {
    ethtool -s eth0 wol g
}

Manage backlight brightness per profile using relight:

bat() {
    if [[ -f $PROFILE_FILE && $(< $PROFILE_FILE) == 'adp' ]]; then
        relight save adp
        relight restore bat
    fi
}

adp() {
    if [[ -f $PROFILE_FILE && $(< $PROFILE_FILE) == 'bat' ]]; then
        relight save bat
        relight restore adp
    fi
}

supplantr/ftw