Difference between revisions of "Powerdown"

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[[Category:Power management]]
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#REDIRECT: [[TLP]]
{{Article summary start}}
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{{Article summary text|{{AUR|powerdown}} is a bunch of scripts by Taylorchu that combine all sorts of settings to make your computer consume less energy and thus save batterylife.}}
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{{Article summary heading|Related}}
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{{Article summary wiki|Pm-utils}}
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{{Article summary wiki|Udev}}
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{{Article summary wiki|Display Power Management Signaling}}
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{{Article summary end}}
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Powerdown is a bunch of scripts to take the hassle out of maximizing battery-life.
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{{Warning|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.}}
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==Installation==
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{{AUR|powerdown-git}} 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.
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}}
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Add the following lines to {{ic|~/.xinitrc}} to turn off your screen after 5 minutes of idling by default:
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{{hc|~/.xinitrc|
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# screen powersave
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xset +dpms
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xset dpms 0 0 300
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}}
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{{Note|The script. If unsatisfactory, add {{ic|1=consoleblank=0}} to the kernel command line and run the following {{ic|xset}} commands (this would be a great addition to the powerdown scripts):
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xset s off
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xset s noblank
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xset s noexpose
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xset c on
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xset -dpms
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}}
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The {{ic|powerdown}} shell script located in {{ic|/usr/bin}} can be customised to your needs. To disable any undesired features simply comment out its appropriate line.
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==Usage==
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The following table presents all scripts installed.
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{| border="1"
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! Name !! Function
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|-
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| powerdown, powerup || Powers everything down or up.
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|-
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| powerdown-functions || Defines functions that are used by powerdown and powerup.
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|-
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| powernow || Displays current power usage and settings.
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|-
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| powerdown.rules || The Udev rule that loads powerdown or powerup.
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|-
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| suspend-to-mem || Suspends to RAM.
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|-
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| suspend-to-disk || Suspends to HDD, creates a 2GB swap file at the first time doing so.
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|-
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| suspend-hybrid || First, suspends to RAM. After 10 minutes, wakes up and suspends to HDD.
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|-
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| pm-is-supported, pm-powersave, pm-suspend, pm-hibernate || Wrappers with pm-utils syntax (for legacy support?).
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|}
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After a reboot the scripts can now be run in a terminal.
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== Automatically running powerdown at power state changes ==
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Powerdown is automatically loaded by a [[Udev]] rule, so no daemon, rc-script or service-file is necessary.
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However, this doesn't work on every machine, so you might want to enable upower.service in systemd with
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# systemctl enable upower.service
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or add {{ic|upower -e}} to your {{ic|.xinitrc}}.
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== Configuration ==
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As there are no config files for powerdown, you have to edit {{ic|/usr/bin/powerdown}} by hand and adjust the values. Note, however, that these changes will be overwritten during an update!
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==FAQ==
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====I do get more spinups and clicks from my HDD. Where is this setting stored in powerdown?====
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Set the following tweak to a higher value:
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hdparm -B
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==Packages that are no longer necessary after installation==
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[https://bbs.archlinux.org/viewtopic.php?pid=1094283#p1094283 Source]
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# <s>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.</s>
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# 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.
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# 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.
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# 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.
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==See also==
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* [https://bbs.archlinux.org/viewtopic.php?id=134109 Initial thread on the forum]
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* [https://aur.archlinux.org/packages.php?ID=57421 AUR page]
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* [https://github.com/taylorchu/powerdown Github repository]
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* [https://github.com/Unia/powersave Alternative, more simple powersave script]
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* [https://aur.archlinux.org/packages/powerconf Another simple power saving system]
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Latest revision as of 06:33, 1 September 2015

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