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UPower

From Wikipedia, the free encyclopedia

For the football stadium in Monza, Italy, see Stadio Brianteo.
UPower
Developer(s)David Zeuthen, Richard Hughes a.o. (freedesktop.org)
Initial release2008; 16 years ago (2008)
/ 8 April 2024; 43 days ago (8 April 2024)
Repository
Written inC
Operating systemLinux
LicenseGPL (free software)
Websiteupower.freedesktop.org

UPower (previously DeviceKit-power) is a piece of middleware (an abstraction layer) for power management on Linux systems.[2] It enumerates power sources, maintains statistics and history data on them and notifies about status changes. It consists of a daemon (upowerd), an application programming interface and a set of command line tools. The daemon provides its functionality to applications over the system bus (an instance of D-Bus, service org.freedesktop.UPower).[3] PolicyKit restricts access to the UPower functionality for initiating hibernate mode or shutting down the operating system (freedesktop.upower.policy).[4] The command-line client program upower can be used to query and monitor information about the power supply devices in the system. Graphical user interfaces to the functionality of UPower include the GNOME Power Manager and the Xfce Power Manager.[5]

UPower is a product of the cross-desktop freedesktop.org project. As free software it is published with its source code under the terms of version 2 or later of the GNU General Public License (GPL).

It was conceived as a replacement for the corresponding features of the deprecated HAL. In 2008, David Zeuthen started a comprehensive rewrite of HAL. This resulted in a set of separate services under the new name "DeviceKit".[6] In 2010 the included DeviceKit-power was renamed. UPower was first introduced and established as a standard in GNOME.[7] In January 2011 the desktop environment Xfce followed (version 4.8).

Sources

  1. ^ "Release v1.90.4".
  2. ^ Michael Kofler (2011), Linux 2011 : Debian, Fedora, openSUSE, Ubuntu (in German) (10 ed.), München: Pearson Education Deutschland GmbH, p. 504, ISBN 9783827330253
  3. ^ Oliver Diedrich (The H Open), 11 February 2013: D-Bus is coming to the Linux Kernel
  4. ^ Richard Petersen (2010), Fedora 14 : Administration and Security (in German), Alameda, CA: Surfing Turtle Press, ISBN 9781936280230
  5. ^ "Xfce:xfce4-power-manager:start [Xfce Docs]".
  6. ^ David Zeuthen (7 May 2008), freedesktop.org (ed.), "Update on DeviceKit", HAL-Mailingliste (in German)
  7. ^ Thorsten Leemhuis (The H Open), 7 August 2012: Comment: Desktop Fragmentation[permanent dead link]

External links

Wikimedia Commons has media related to UPower.
This page was last edited on 16 March 2024, at 02:35
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