# Power Management

&Dario.Freddi;&Dario.Freddi.mail;
2013-08-18
&kde; 4.11
KDE System Settings powerdevil power management laptop power

## PowerDevil, a Power Management Daemon

This module is a configuration tool for managing Power Management in &kde;. It is a configurator for the PowerDevil daemon, that you can start or stop from the Service Manager module.

Through this module, you can define your computer's behavior in various situations, allowing you to save as much energy as possible.

Powerdevil works with Solid only and it's integrated in your desktop. You won't even notice it is running, apart from notifications. Moreover, Powerdevil checks your system capabilities first, so you'll see only options available for your system in this module.

Note that PowerDevil does not poll your system. This means that it will not waste energy while trying to save it, as some other power managers do.

### Energy Saving Settings

This page shows the actual energy saving settings. If a battery is detected you have three tabs with different settings for On AC Power, On Battery and On Low Battery profiles.

Energy Saving Settings

Energy Saving Settings

Energy Saving Settings

There are a lot of options you can configure for each profile:

Screen Brightness

  Sets the screen's brightness using a slider.

Dim Screen

  If checked, the display will be progressively dimmed, until reaching brightness 0, in the amount of time you specify in the spin box.

Screen Energy Saving

  Here you can define power saving for your monitor. The check box defines if DPMS support should be enabled or disabled. If you choose to activate it, set the timeouts in the spin boxes below.

Suspend Session

  Suspends the session after the selected time to the status Sleep, Hibernate, Shutdown or Lock screen.

Button events handling

  Select actions to perform whenever the laptop lid is closed or a button is pressed.

Run Script

  Activate this option to run a custom script when a profile is loaded, unloaded or after a given amount of time.

### Activity Settings

Here you can configure the Power Management settings per activity. The settings for each activity can be configured on its own tab.

Activity Settings

Activity Settings

Activity Settings

Don't use special settings

  Use the settings defined on Energy Saving page.

Act like

  Here you can choose a predefined profile from the drop-down box: PC running on AC power, PC running on battery power or PC running on low battery.

Define a special behavior

  If this option is chosen, a special behavior for activity can be chosen. If this is a presentation activity, you can check the Never shutdown the screen and Never suspend or shutdown the computer boxes. It is also possible to define the time interval for the computer to switch to a suspension mode for the power saving activities.

Use separate settings (advanced users only)

  This option allows users to choose the detail power saving settings for a separate activity. The settings are similar to the settings from the Energy Saving page.

### Advanced Settings

Advanced Settings

Advanced Settings

Advanced Settings

Battery levels

  These items are only displayed if a battery is detected.

  Battery is at low level at

    Here you can set the percentage after which the battery will be considered low.

  Battery is at critical level at

    Here you can set the percentage after which the battery will be considered at critical level.

  When battery is at critical level

    Defines the action that will be done when battery reaches the critical level.

Events
  Lock screen on resume

    When this box is checked, every time the PC gets suspended, the screen will be locked when resuming. You will be asked for a password when resuming from sleep state.

  Never prevent an action on lid close

    When this option is selected, applications will not be allowed to inhibit sleep when the lid is closed.

  Configure Notifications

    If you want a deeper control over your notifications, you can refine them by clicking this button.

## PowerDevil Runner

PowerDevil can be manually controlled through &krunner; (&Alt;F2). This makes changing profile, brightness, governor and more much easier and faster. The runner has various keywords you can enter to access its functions

### Runner Keywords

Here comes a list of keywords you can enter in &krunner; to perform PowerDevil related actions.

Power Profile

  You can manually choose a profile using this keyword. All available profiles will be shown in form of &krunner; matches.

Screen Brightness

  You can control screen brightness through this keyword. In this form, some &krunner; matches that let you do some common actions will be shown. If you enter a value after the keyword (⪚: `Screen Brightness 50`), the brightness will be set to that value.

Suspend

  You can suspend your pc through this keyword. Available suspend methods will be shown as &krunner; matches.