420 lines
16 KiB
XML
420 lines
16 KiB
XML
<?xml version="1.0" encoding="UTF-8" ?>
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<!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook XML V4.3//EN"
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"http://www.oasis-open.org/docbook/xml/4.3/docbookx.dtd"
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[
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<!ENTITY % defs SYSTEM "defs.ent"> %defs;
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]>
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<!-- lifted from troff+ms+XMan by doclifter -->
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<book id="dpmslib">
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<bookinfo>
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<title>X Display Power Management Signaling (DPMS) Extension</title>
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<subtitle>X Consortium Standard</subtitle>
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<releaseinfo>X Version 11, Release &fullrelvers;</releaseinfo>
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<releaseinfo>Version 1.0</releaseinfo>
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<authorgroup>
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<author>
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<firstname>Rob</firstname><surname>Lembree</surname>
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<affiliation><orgname>Digital Equipment Corporation</orgname></affiliation>
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<email>lembree@zk3.dec.com</email>
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</author>
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</authorgroup>
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<copyright><year>1996</year><holder>Digital Equipment Corporation</holder></copyright>
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<legalnotice>
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<para>
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Permission to use, copy, modify, distribute, and sell this
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documentation for any purpose is hereby granted without fee,
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provided that the above copyright notice and this permission
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notice appear in all copies. Digital Equipment Corporation
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makes no representations about the suitability for any purpose
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of the information in this document. This documentation is
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provided "as is" without express or implied warranty.
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</para>
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<para>X Window System is a trademark of The Open Group.</para>
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</legalnotice>
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</bookinfo>
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<chapter id='overview'>
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<title>Overview</title>
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<para>This extension provides X Protocol control over the VESA Display
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Power Management Signaling (DPMS) characteristics of video boards
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under control of the X Window System.
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</para>
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<para>
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Traditionally, the X Window System has provided for both blanking and
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non-blanking screen savers. Timeouts associated with these built-in
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screen saver mechanisms are limited to idle (dwell) time, and a change
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timeout that specifies the change interval for non-blanking screen savers.
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</para>
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<para>
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The United States' Environmental Protection Agency (EPA) Energy Star program
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requires that monitors power down after some idle time by default.
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While it is possible to simply overload the existing screen saver timeouts,
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this solution leaves the non-privileged user little to no control over
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the DPMS characteristics of his or her system. For example, disabling
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DPMS would require some unintended side effect in the core screen saver,
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such as disabling the changing of a non-blanking screen saver. Providing
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clients with this control requires an extension to the core X Window System
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Protocol, and this extension seeks to fill this gap.
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</para>
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<para>
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There are four power levels specified by the Video Electronics Standards
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Association (VESA) Display Power Management Signaling (DPMS) standard.
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These are mapped onto the X DPMS Extension like this:
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</para>
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<literallayout remap='Ds'>
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<function>DPMS Extension Power Levels</function>
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0 DPMSModeOn In use
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1 DPMSModeStandby Blanked, low power
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2 DPMSModeSuspend Blanked, lower power
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3 DPMSModeOff Shut off, awaiting activity
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</literallayout> <!-- remap='De' -->
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</chapter>
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<chapter id='dpms_functions'>
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<title>DPMS Functions</title>
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<funcsynopsis id='DPMSQueryExtention'>
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<funcprototype>
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<funcdef>Bool <function>DPMSQueryExtention</function></funcdef>
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<paramdef>Display <parameter>*display</parameter></paramdef>
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<paramdef>int <parameter>event_base</parameter></paramdef>
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<paramdef>int <parameter>error_base</parameter></paramdef>
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</funcprototype>
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</funcsynopsis>
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<variablelist remap='IP'>
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<varlistentry>
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<term><emphasis remap='I'>*display</emphasis></term>
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<listitem><para>Specifies the connection to the X server.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><emphasis remap='I'>event_base</emphasis></term>
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<listitem><para>Specifies the return location for the assigned base event</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><emphasis remap='I'>error_base</emphasis></term>
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<listitem><para>Specifies the return location for the assigned base error</para></listitem>
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</varlistentry>
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</variablelist>
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<para>
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The DPMSQueryExtension function queries the X server to determine the
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availability of the DPMS Extension. If the extension is available, the
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return value is TRUE, and <emphasis remap='I'>event_base</emphasis> and
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<emphasis remap='I'>error_base</emphasis> are set to the base event number
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and base error number for the extension, respectively. Otherwise, the
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return value is FALSE, and the values of
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<emphasis remap='I'>event_base</emphasis> and
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<emphasis remap='I'>error_base</emphasis> are undefined.
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</para>
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<funcsynopsis id='DPMSGetVersion'>
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<funcprototype>
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<funcdef>Status <function>DPMSGetVersion</function></funcdef>
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<paramdef>Display <parameter>*display</parameter></paramdef>
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<paramdef>int <parameter>*major_version</parameter></paramdef>
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<paramdef>int <parameter>*minor_version</parameter></paramdef>
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</funcprototype>
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</funcsynopsis>
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<variablelist remap='IP'>
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<varlistentry>
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<term><emphasis remap='I'>display</emphasis></term>
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<listitem><para>Specifies the connection to the X server.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><emphasis remap='I'>major_version</emphasis></term>
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<listitem><para>Specifies the return location for the extension major version.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><emphasis remap='I'>minor_version</emphasis></term>
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<listitem><para>Specifies the return location for the extension minor version.</para></listitem>
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</varlistentry>
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</variablelist>
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<para>
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The DPMSGetVersion function returns the version of the DPMS extension
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implemented by the X server. The version is returned in
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<emphasis remap='I'>major_version</emphasis> and
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<emphasis remap='I'>minor_version</emphasis>.
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The major version and minor version for this specification are '1' and '1',
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respectively. The major version will be incremented for protocol
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incompatible changes, and the minor version will be incremented for small,
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upwardly compatible changes.
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</para>
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<funcsynopsis id='DPMSCapable'>
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<funcprototype>
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<funcdef>Bool <function>DPMSCapable</function></funcdef>
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<paramdef>Display <parameter>*display</parameter></paramdef>
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</funcprototype>
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</funcsynopsis>
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<variablelist remap='IP'>
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<varlistentry>
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<term><emphasis remap='I'>display</emphasis></term>
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<listitem><para>Specifies the connection to the X server.</para></listitem>
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</varlistentry>
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</variablelist>
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<para>
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The DPMSCapable function returns the DPMS capability of the X server, either
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TRUE (capable of DPMS) or FALSE (incapable of DPMS). The capability of an
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X server is implementation defined. For example, if a multi-headed X server
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is capable of DPMS on one head, and incapable on another, the truth value of
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this function is defined by the X server implementation.
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</para>
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<funcsynopsis id='DPMSSetTimeouts'>
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<funcprototype>
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<funcdef>Status <function>DPMSSetTimeouts</function></funcdef>
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<paramdef>Display <parameter>*display</parameter></paramdef>
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<paramdef>CARD16 <parameter>standby</parameter></paramdef>
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<paramdef>CARD16 <parameter>suspend</parameter></paramdef>
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<paramdef>CARD16 <parameter>off</parameter></paramdef>
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</funcprototype>
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</funcsynopsis>
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<variablelist remap='IP'>
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<varlistentry>
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<term><emphasis remap='I'>display</emphasis></term>
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<listitem><para>Specifies the connection to the X server.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><emphasis remap='I'>standby</emphasis></term>
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<listitem><para>Specifies the new standby timeout in seconds.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><emphasis remap='I'>suspend</emphasis></term>
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<listitem><para>Specifies the new suspend timeout in seconds.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><emphasis remap='I'>off</emphasis></term>
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<listitem><para>Specifies the new off timeout in seconds.</para></listitem>
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</varlistentry>
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</variablelist>
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<para>
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The DPMSSetTimeouts function permits applications to set the timeout values
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used by the X server for DPMS timings.
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</para>
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<para>
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The value <emphasis remap='I'>standby</emphasis> is the amount of time of
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inactivity in seconds before standby mode is invoked. The actual effects of
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this mode are implementation defined, but in the case of DPMS compliant
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hardware, it is implemented by shutting off the horizontal sync signal,
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and pulsing the vertical sync signal.
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Standby mode provides the quickest monitor recovery time. Note also that
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many monitors implement this mode identically to suspend mode. A value
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of zero disables this mode.
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</para>
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<para>
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The value <emphasis remap='I'>suspend</emphasis> is the amount of time of
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inactivity in seconds before the second level of power savings is invoked.
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Suspend mode's physical and electrical characteristics are implementation
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defined, but in DPMS compliant hardware, results in the pulsing of the
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horizontal sync signal, and shutting off of the vertical sync signal.
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Suspend mode recovery is considered to be slower than standby mode, but
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faster than off mode, however this is monitor dependent. As noted above,
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many monitors implement this mode identically to standby mode. A value of
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zero disables this mode.
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</para>
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<para>
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The value <emphasis remap='I'>off</emphasis> is the amount of time of
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inactivity in seconds before the third and final level of power savings is
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invoked. Off mode's physical and electrical characteristics are
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implementation defined, but in DPMS compliant hardware, is implemented by
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shutting off both horizontal and vertical sync signals, resulting in
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the power-down of the monitor. Recovery time is implementation dependant,
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but frequently is similar to the power-up time of the monitor. A value
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of zero disables this mode.
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</para>
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<para>
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Chronologically, standby mode occurs before or simultaneously with
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suspend mode, and suspend mode must occur before or simultaneously with
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off mode. Therefore, non-zero mode timeout values must be greater than
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or equal to the timeout values of earlier modes. If inconsistent values
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are supplied, a BadValue error will result.
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</para>
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<funcsynopsis id='DPMSGetTimeouts'>
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<funcprototype>
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<funcdef>Status <function>DPMSGetTimeouts</function></funcdef>
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<paramdef>Display <parameter>*display</parameter></paramdef>
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<paramdef>CARD16 <parameter>*standby</parameter></paramdef>
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<paramdef>CARD16 <parameter>*suspend</parameter></paramdef>
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<paramdef>CARD16 <parameter>*off</parameter></paramdef>
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</funcprototype>
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</funcsynopsis>
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<variablelist remap='IP'>
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<varlistentry>
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<term><emphasis remap='I'>display</emphasis></term>
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<listitem><para>Specifies the connection to the X server.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><emphasis remap='I'>standby</emphasis></term>
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<listitem><para>Specifies the new standby timeout in seconds.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><emphasis remap='I'>suspend</emphasis></term>
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<listitem><para>Specifies the new suspend timeout in seconds.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><emphasis remap='I'>off</emphasis></term>
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<listitem><para>Specifies the new off timeout in seconds.</para></listitem>
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</varlistentry>
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</variablelist>
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<para>
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The DPMSGetTimeouts function retrieves the timeout values used by the X
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server for DPMS timings.
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</para>
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<para>
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The value <emphasis remap='I'>standby</emphasis> is the amount of time of
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inactivity in seconds before standby mode is invoked. A value of zero
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indicates that this mode has been disabled.
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</para>
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<para>
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The value <emphasis remap='I'>suspend</emphasis> is the amount of time of
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inactivity in seconds before the second level of power savings is invoked.
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A value of zero indicates that this mode has been disabled.
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</para>
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<para>
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The value <emphasis remap='I'>off</emphasis> is the amount of time of
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inactivity in seconds before the third and final level of power savings is
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invoked. A value of zero indicates that this mode has been disabled.
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</para>
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<funcsynopsis id='DPMSEnable'>
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<funcprototype>
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<funcdef>Status <function>DPMSEnable</function></funcdef>
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<paramdef>Display <parameter>*display</parameter></paramdef>
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</funcprototype>
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</funcsynopsis>
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<variablelist remap='IP'>
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<varlistentry>
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<term><emphasis remap='I'>display</emphasis></term>
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<listitem><para>Specifies the connection to the X server.</para></listitem>
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</varlistentry>
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</variablelist>
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<para>
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The DPMSEnable function enables DPMS on the specified display. When
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enabled, DPMS will use the currently saved timeout values, and will
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invoke the DPMS power mode appropriate for the amount of time that
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the workstation input devices have been idle. If DPMSEnable is invoked
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on a display with DPMS already enabled, no change is made, and no
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error is returned. If DPMSEnable is invoked on a display without
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support for DPMS, no change is made and no error is returned.
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</para>
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<funcsynopsis id='DPMSDisable'>
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<funcprototype>
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<funcdef>Status <function>DPMSDisable</function></funcdef>
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<paramdef>Display <parameter>*display</parameter></paramdef>
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</funcprototype>
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</funcsynopsis>
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<variablelist remap='IP'>
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<varlistentry>
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<term><emphasis remap='I'>display</emphasis></term>
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<listitem><para>Specifies the connection to the X server.</para></listitem>
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</varlistentry>
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</variablelist>
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<para>
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The DPMSDisable function disables DPMS on the specified display. When
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disabled, DPMS returns the display to DPMSModeOn. If DPMSDisable is
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invoked on a display with DPMS already disabled, no change is made,
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and no error is returned. If DPMSDisable is invoked on a display
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without support for DPMS, no change is made and no error is returned.
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</para>
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<funcsynopsis id='DPMSForceLevel'>
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<funcprototype>
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<funcdef>Status <function>DPMSForceLevel</function></funcdef>
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<paramdef>Display <parameter>*display</parameter></paramdef>
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<paramdef>CARD16 <parameter>level</parameter></paramdef>
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</funcprototype>
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</funcsynopsis>
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<variablelist remap='IP'>
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<varlistentry>
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<term><emphasis remap='I'>display</emphasis></term>
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<listitem><para>Specifies the connection to the X server.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><emphasis remap='I'>level</emphasis></term>
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<listitem><para>Specifies the level to force power to.</para></listitem>
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</varlistentry>
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</variablelist>
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<para>
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The DPMSForceLevel function forces a DPMS capable display into the
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specified power level. The <emphasis remap='I'>level</emphasis> must be one of
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DPMSModeOn, DPMSModeStandby, DPMSModeSuspend, or DPMSModeOff.
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Values other than these will result in a BadValue error. If DPMS
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is disabled on the display, a BadMatch protocol error will result.
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</para>
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<para>Status DPMSInfo(<emphasis remap='I'>display, power_level, state</emphasis>)</para>
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<funcsynopsis id='DPMSInfo'>
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<funcprototype>
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<funcdef>Status <function>DPMSInfo</function></funcdef>
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<paramdef>Display <parameter>*display</parameter></paramdef>
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<paramdef>CARD16 <parameter>power_level</parameter></paramdef>
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<paramdef>BOOL <parameter>*state</parameter></paramdef>
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</funcprototype>
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</funcsynopsis>
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<variablelist remap='IP'>
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<varlistentry>
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<term><emphasis remap='I'>display</emphasis></term>
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<listitem><para>Specifies the connection to the X server.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><emphasis remap='I'>power_level</emphasis></term>
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<listitem><para>Specifies the current power level.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><emphasis remap='I'>state</emphasis></term>
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<listitem><para>Specifies the current DPMS state.</para></listitem>
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</varlistentry>
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</variablelist>
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<para>
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The DPMSInfo function returns information about the current DPMS state.
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The <emphasis remap='I'>state</emphasis> return parameter indicates whether
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or not DPMS is enabled (TRUE) or disabled (FALSE). The
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<emphasis remap='I'>power_level</emphasis> return parameter indicates the
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current power level (one of DPMSModeOn, DPMSModeStandby, DPMSModeSuspend,
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or DPMSModeOff.)
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</para>
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</chapter>
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</book>
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