Powersaved

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[edit] IMPORTANT

The powersaved package has been replaced by Pm-utils (hibernate/suspend) and Cpufrequtils (CPU frequency scaling). Please see those wikis for up-to-date information.

[edit] Goals

The goal of this article is to get cpu speedstep enabled. Also suspend to ram and possibly to disk too, both possible for standard (non-root) users. This should all be provided by the powersaved daemon.

[edit] Required packages

  • extra/powersave
  • extra/gnome-power-manager (or kde equivalent)(optional)

Install by doing: 

pacman -Sy powersave gnome-power-manager

[edit] Post-installation steps

  1. Add your user to the power group (e.g. by editing /etc/group).
  2. Put powersaved into the daemons array in /etc/rc.conf, or manually start the daemon (/etc/rc.d/powersaved start with root privileges).
  3. Run gnome-power-manager (if applicable). gnome-power-preferences can be used if you cannot see the program icon in the system tray by default.

[edit] CPU Stepping

When you started for the first time, the powersave daemon will give you a warning like this: 

enter 'powernow_k8' into CPUFREQD_MODULE in /etc/powersave/cpufreq.
this will speed up starting powersaved and avoid unnecessary warnings in syslog.

Sometimes auto detection of the right module fails. So if you are sure you need a module different from the one provided you should use that instead.

You should edit the /etc/powersave/cpufreq file as root and adjust the following parameters:

  • CPUFREQD_MODULE
  • CPUFREQ_CONTROL 
$editor /etc/powersave/cpufreq

Set CPUFREQD_MODULE to the module the auto detection found, or the one you think you need. I'd like to set CPUFREQ_CONTROL to ondemand.

Now, when you restart the powersave daemon, it should start without warnings.

To test if you actually now have speedstep enabled, I use a gnome tool that you can add to your panel. It's called CPU Frequency Scaling Monitor.

[edit] Suspend to ram (suspend2ram)

If using gnome-power-manager, you can click Suspend on the system tray icon. From console, run: 

powersave -u

Problems can be diagnosed in /var/log/suspend2ram.log

[edit] Suspend to disk (suspend2disk)

In order to get suspend2disk to work (this is labeled as hibernate by Gnome convention), you will need to edit your GRUB menu.lst file (e.g. /boot/grub/menu.lst).

Add resume=/dev/swap as the kernel argument to menu.lst, where swap is your swap device.

E.g. 

# (0) Arch Linux
title  Arch Linux  [/boot/vmlinuz]
root   (hd0,2)
kernel /boot/vmlinuz26 root=/dev/hda3 resume=/dev/hda4 ro
initrd /boot/kernel26.img

Reboot before you attempt to use the feature.

You can suspend to disk by clicking on Hibernate in gnome-power-manager menu or in console by: 

powersave -U

Problems can be diagnosed in /var/log/suspend2disk.log file.

[edit] Known issues

  • Sometimes auto detection of cpufreq modules doesn't detect the proper module. Users are advised to check if the correct CPU module has been loaded after installation
  • ATI video card owners may need to disable the framebuffer in order for suspend-to-ram to work properly. Add vga=0 to the kernel options in /boot/grub/menu.lst
Retrieved from "http://wiki.archlinux.org/index.php/Powersaved"
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