Difference between revisions of "Powerdown"

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(Installation: these are bad options to recommend - ASPM is almost always enabled now, and can cause problems if forced on broken hardware, rc6 is also on a higher state by default and doing that increases power usage)
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[[Category:Power management]]
{{Article summary start}}
{{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.}}
{{Article summary heading|Related}}
{{Article summary wiki|Pm-utils}}
{{Article summary wiki|Udev}}
{{Article summary wiki|Display Power Management Signaling}}
{{Article summary end}}
Powerdown is a bunch of scripts to take the hassle out of maximizing battery-life.
{{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.}}
{{AUR|powerdown}} is available from the [[AUR]].
{{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.
Add the following lines to {{ic|~/.xinitrc}} to turn off your screen after 5 minutes of idling by default:
# screen powersave
xset +dpms
xset dpms 0 0 300
{{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):
xset s off
xset s noblank
xset s noexpose
xset c on
xset -dpms
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.
The following table presents all scripts installed.
{| border="1"
! 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 {{ic|upower -e}} to your {{ic|.xinitrc}}.
== Configuration ==
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!
====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==
[https://bbs.archlinux.org/viewtopic.php?pid=1094283#p1094283 Source]
# <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>
# 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.
==See also==
* [https://bbs.archlinux.org/viewtopic.php?id=134109 Initial thread on the forum]
* [https://aur.archlinux.org/packages.php?ID=57421 AUR page]
* [https://github.com/taylorchu/powerdown Github repository]
* [https://github.com/Unia/powersave Alternative, more simple powersave script]

Latest revision as of 06:33, 1 September 2015

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