Powerdown

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Powerdown is a script to take the hassle out of maximizing battery-life.

Note: Use at your own risk. It is recommended to read through all the tweaks in order to disable those that might not be compatible with your system.

Installation

Use your favourite AUR-helper to install powerdownAUR, f.e.

# packer -S powerdown xorg-xset

Add the following options to your kernel boot-line (f.e. in grub's menu.lst):

pcie_aspm=force i915.i915_enable_rc6=1

Add the following lines to ~/.xinitrc:

# screen powersave
xset +dpms
xset dpms 0 0 300

The script is located at ... Should you want to disable certain tweaks, you can easily comment them out by prepending '#'

Usage

After a reboot the script can now be run in a terminal:

# powerdown

To make it run on startup add the following to /etc/rc.local:

powerdown &

There are also other scripts included in the package:

# powerup

...

FAQ

I do get more spinups and clicks from my HDD. Where is this setting stored in powerdown?

Set the following tweak to a higher value:

hdparm -B

Packages that are no longer necessary after installation

Source

  1. powertop, powertop2: these packages have no updates for at least 3-4 years. if you think kernel has no changes on power management for 3 or 4 years, go ahead and continue to use them. Replacement: ppower is included in new powerdown. it shows laptop power usage in mWh. the value is usually between 10000 to 25000.
  2. laptop-mode-tools: this is a huge framework on power management. It has dozens of configs you need to setup, which normally no one knows how to control them. I think it is a "troubleware"; to use it properly, you have to google more. most of time, you dont even know what works or not. Replacement: powerdown shows what does not work right in the screen. it contains all the rules optimized that just work.
  3. tuxonice, uswsusp, pm-utils: too hassle to set things up. again, they complicate suspend and resume. the default kernel already support suspends and resume pretty well. Replacement: ps2mem uses default kernel for ram suspend and resume. you just run "sudo ps2mem"; no framework, no setup.
  4. ppoweroff solves a bug in kernel(even in 3,4 rc that ehci_hcd messes up shutdown when it is set to powersave mode). This is a wrapper for 'poweroff'. You just call it to shut down your arch box.

See also