Difference between revisions of "Powerdown"
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==Installation== | ==Installation== | ||
{{AUR|powerdown}} is available from the [[AUR]]. | {{AUR|powerdown}} is available from the [[AUR]]. | ||
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{{Note|Powerdown tries disabling NMI watchdog on the fly. If this doesn't work for you, you'll see "Dazed and confused" messages when suspending. You can disable it completely by adding {{ic|1=nmi_watchdog=0}} to the kernel command line. | {{Note|Powerdown tries disabling NMI watchdog on the fly. If this doesn't work for you, you'll see "Dazed and confused" messages when suspending. You can disable it completely by adding {{ic|1=nmi_watchdog=0}} to the kernel command line. | ||
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* [https://github.com/taylorchu/powerdown Github repository] | * [https://github.com/taylorchu/powerdown Github repository] | ||
* [https://github.com/Unia/powersave Alternative, more simple powersave script] | * [https://github.com/Unia/powersave Alternative, more simple powersave script] | ||
| + | * [https://aur.archlinux.org/packages/powerconf Another simple power saving system] | ||
Revision as of 15:32, 19 February 2013
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Powerdown is a bunch of scripts to take the hassle out of maximizing battery-life.
Contents
Installation
powerdownAUR is available from the AUR.
Add the following lines to ~/.xinitrc to turn off your screen after 5 minutes of idling by default:
~/.xinitrc
# screen powersave xset +dpms xset dpms 0 0 300
The powerdown shell script located in /usr/bin can be customised to your needs. To disable any undesired features simply comment out its appropriate line.
Usage
The following table presents all scripts installed.
| Name | Function |
|---|---|
| powerdown, powerup | Powers everything down or up. |
| powerdown-functions | Defines functions that are used by powerdown and powerup. |
| powernow | Displays current power usage and settings. |
| powerdown.rules | The Udev rule that loads powerdown or powerup. |
| suspend-to-mem | Suspends to RAM. |
| suspend-to-disk | Suspends to HDD, creates a 2GB swap file at the first time doing so. |
| suspend-hybrid | First, suspends to RAM. After 10 minutes, wakes up and suspends to HDD. |
| pm-is-supported, pm-powersave, pm-suspend, pm-hibernate | Wrappers with pm-utils syntax (for legacy support?). |
After a reboot the scripts can now be run in a terminal.
Automatically running powerdown at power state changes
Powerdown is automatically loaded by a Udev rule, so no daemon, rc-script or service-file is necessary.
However, this doesn't work on every machine, so you might want to enable upower.service in systemd with
# systemctl enable upower.service
or add upower -e to your .xinitrc.
Configuration
As there are no config files for powerdown, you have to edit /usr/bin/powerdown by hand and adjust the values. Note, however, that these changes will be overwritten during an update!
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
-
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: powernow is included in new powerdown. it shows laptop power usage in mWh. the value is usually between 10000 to 25000. - 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.
- 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 suspend-to-mem"; no framework, no setup.
- turn-off 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.