247 lines
4.7 KiB
HTML
247 lines
4.7 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
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<HTML
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><HEAD
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><TITLE
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>DPMS</TITLE
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><META
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NAME="GENERATOR"
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CONTENT="Modular DocBook HTML Stylesheet Version 1.7"><LINK
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REL="HOME"
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TITLE="Battery Powered Linux Mini-HOWTO"
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HREF="index.html"><LINK
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REL="PREVIOUS"
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TITLE="Power Management"
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HREF="powermgm.html"><LINK
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REL="NEXT"
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TITLE="Power Management Methods"
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HREF="methods.html"></HEAD
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><BODY
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CLASS="SECT1"
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BGCOLOR="#FFFFFF"
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TEXT="#000000"
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LINK="#0000FF"
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VLINK="#840084"
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ALINK="#0000FF"
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><DIV
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CLASS="NAVHEADER"
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><TABLE
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SUMMARY="Header navigation table"
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WIDTH="100%"
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BORDER="0"
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CELLPADDING="0"
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CELLSPACING="0"
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><TR
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><TH
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COLSPAN="3"
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ALIGN="center"
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>Battery Powered Linux Mini-HOWTO</TH
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></TR
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><TR
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><TD
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WIDTH="10%"
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ALIGN="left"
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VALIGN="bottom"
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><A
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HREF="powermgm.html"
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ACCESSKEY="P"
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>Prev</A
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></TD
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><TD
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WIDTH="80%"
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ALIGN="center"
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VALIGN="bottom"
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></TD
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><TD
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WIDTH="10%"
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ALIGN="right"
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VALIGN="bottom"
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><A
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HREF="methods.html"
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ACCESSKEY="N"
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>Next</A
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></TD
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></TR
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></TABLE
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><HR
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ALIGN="LEFT"
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WIDTH="100%"></DIV
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><DIV
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CLASS="SECT1"
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><H1
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CLASS="SECT1"
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><A
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NAME="DISPLAYTYPES"
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></A
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>2. DPMS</H1
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><P
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><B
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CLASS="COMMAND"
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>DPMS</B
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> (Display Power Management Signaling) is a standard to
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reduce power consumption in monitors. Typically, both the monitor and the video card
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must support the DPMS standard in order to receive any benefit from it. DPMS specifies
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four modes of operation (in order of increasing power savings): "Normal", "Standby",
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"Suspend" and "Off". Two signal lines, "Horizontal Sync" and "Vertical Sync" provide
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a method for signaling these four different states to a DPMS monitor.</P
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><P
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>A good technical resource on DPMS is available at
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<A
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HREF="http://webpages.charter.net/dperr/dpms.htm"
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TARGET="_top"
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>http://webpages.charter.net/dperr/dpms.htm</A
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>.</P
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><DIV
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CLASS="SECT2"
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><H2
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CLASS="SECT2"
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><A
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NAME="NORMAL"
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></A
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>2.1. Normal</H2
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><P
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><B
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CLASS="COMMAND"
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>Normal</B
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> means just that -- the monitor is fully powered and on.
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LCD laptop panels and LCD flat screens use considerably less power than traditional CRT
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monitors.</P
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></DIV
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><DIV
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CLASS="SECT2"
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><H2
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CLASS="SECT2"
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><A
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NAME="STANDBY"
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></A
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>2.2. Standby</H2
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><P
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><B
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CLASS="COMMAND"
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>Standby</B
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> is used to describe a very minor power
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savings level. This setting usually involves
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blanking the screen by turning off the electron (RGB) gun. However, the
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power supply is left on and the tube filaments energized.
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When you need to use the monitor again, the monitor will come back on very
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quickly.
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This option requires DPMS monitor and video card support along with enabling
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DPMS in XFree86.
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Standby is sometimes referred to as <EM
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>hsync suspend mode</EM
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>
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since the horizontal sync signal
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is turned off to signal this power management state to a DPMS monitor.</P
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></DIV
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><DIV
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CLASS="SECT2"
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><H2
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CLASS="SECT2"
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><A
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NAME="SUSPEND"
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></A
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>2.3. Suspend</H2
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><P
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><B
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CLASS="COMMAND"
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>Suspend</B
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> is used to describe a very strong low power
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state. This setting usually involves the same
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power conservation as <B
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CLASS="COMMAND"
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>Standby</B
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> however in addition the power
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supply to the monitor is turned off.
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This option requires DPMS monitor and video card support along with enabling
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DPMS in XFree86.
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Suspend is sometimes referred to as <EM
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>vsync suspend mode</EM
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>
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since the vertical sync signal
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is turned off to signal this power management state to a DPMS monitor.</P
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></DIV
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><DIV
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CLASS="SECT2"
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><H2
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CLASS="SECT2"
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><A
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NAME="OFF"
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></A
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>2.4. Off</H2
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><P
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><B
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CLASS="COMMAND"
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>Off</B
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> usually means just that -- the computer monitor
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is turned off. Usually, a small
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auxiliary circuit stays on to monitor the signals from the computer to turn
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the monitor back on when data needs to be displayed to the screen.
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Obviously, this keeps power consumption to a bare minimum (if not zero).
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While the power saving is substantial, to reactivate the monitor may take
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several seconds.
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This option requires DPMS monitor and video card support along with enabling
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DPMS in XFree86.
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Both the horizontal and vertical sync signals are turned off to signal this
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power management state to a DPMS monitor.</P
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></DIV
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></DIV
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><DIV
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CLASS="NAVFOOTER"
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><HR
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ALIGN="LEFT"
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WIDTH="100%"><TABLE
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SUMMARY="Footer navigation table"
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WIDTH="100%"
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BORDER="0"
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CELLPADDING="0"
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CELLSPACING="0"
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><TR
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><TD
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WIDTH="33%"
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ALIGN="left"
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VALIGN="top"
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><A
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HREF="powermgm.html"
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ACCESSKEY="P"
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>Prev</A
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></TD
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><TD
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WIDTH="34%"
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ALIGN="center"
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VALIGN="top"
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><A
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HREF="index.html"
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ACCESSKEY="H"
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>Home</A
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></TD
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><TD
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WIDTH="33%"
|
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ALIGN="right"
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VALIGN="top"
|
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><A
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HREF="methods.html"
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ACCESSKEY="N"
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>Next</A
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></TD
|
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></TR
|
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><TR
|
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><TD
|
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WIDTH="33%"
|
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ALIGN="left"
|
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VALIGN="top"
|
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>Power Management</TD
|
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><TD
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WIDTH="34%"
|
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ALIGN="center"
|
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VALIGN="top"
|
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> </TD
|
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><TD
|
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WIDTH="33%"
|
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ALIGN="right"
|
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VALIGN="top"
|
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>Power Management Methods</TD
|
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></TR
|
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></TABLE
|
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></DIV
|
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></BODY
|
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></HTML
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> |