292 lines
4.8 KiB
HTML
292 lines
4.8 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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>Power Saving Techniques</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="Linux Ecology-HOWTO"
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HREF="index.html"><LINK
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REL="UP"
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TITLE="Appendix A - Linux with Laptops"
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HREF="ecology-howto-appendix-a.html"><LINK
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REL="PREVIOUS"
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TITLE="PCMCIA Card Services and Advanced Power Management"
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HREF="ecology-howto-appendix-a-2.html"><LINK
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REL="NEXT"
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TITLE="Appendix B - MP3-Hardware-Decoder at Parallel Port"
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HREF="ecology-howto-appendix-b.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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VLINK="#840084"
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SUMMARY="Header navigation table"
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><TR
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COLSPAN="3"
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>Linux Ecology-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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>Prev</A
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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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>Appendix A. Appendix A - Linux with Laptops</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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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="ecology-howto-appendix-a-3"
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></A
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>A.4. Power Saving Techniques</H1
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><P
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>
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<P
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></P
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><UL
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><LI
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><P
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> If you don't need infrared support,
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disable it in the BIOS or shutdown the
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IrDA device driver. There are also some
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IrDA features of the kernel which are
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useful for saving power.
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In the specifications of my HP
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OmniBook 800 it is recommended to turn
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off the IR port, if it is not in use,
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because it may consume up to 10
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percent of the battery time.
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If necessary, you may also try to
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disable the <B
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CLASS="command"
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>Fast RRs</B
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> feature in the IrDA
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section of the kernel. This option
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will give you much better latencies
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but will consume more power.
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</P
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></LI
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><LI
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><P
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>
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PCMCIA services consume much power, so shut them down if you don't need them.
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</P
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></LI
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><LI
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><P
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> I'm not sure to which extend the
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<B
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CLASS="command"
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>backlight</B
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>
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consumes power. WARNING: AFAIK
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this device can only bear a
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limited number of uptime circles.
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So avoid using screensavers too
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much.
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</P
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></LI
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><LI
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><P
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> For some examples to build
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batteries with increased uptime
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up to 8 hours look at
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<A
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HREF="http://www.silverace.com/libretto/"
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TARGET="_top"
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>Adorable Toshiba Libretto</A
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>.
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</P
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></LI
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><LI
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><P
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> For information about APM look at the APM chapter above.
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</P
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></LI
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><LI
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><P
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> <A
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HREF="http://www-leland.stanford.edu/~bbense/toys/"
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TARGET="_top"
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>A hacked rclock</A
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>.
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Booker C. Bense has hacked the
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<B
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CLASS="command"
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>rclock</B
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> program to include a simple battery power
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meter on the clock face.
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</P
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></LI
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><LI
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><P
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> <A
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HREF="http://www.kde.org/"
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TARGET="_top"
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>KDE</A
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> provides
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<B
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CLASS="command"
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>KAPM</B
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>, <B
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CLASS="command"
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>Kbatmon</B
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> and
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<B
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CLASS="command"
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>Kcmlaptop</B
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>. Written by Paul Campbell
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<B
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CLASS="command"
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>kcmlaptop</B
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> is a set of KDE control panels that
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implements laptop computer support functions, it includes a dockable
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battery status monitor for laptops - in short a little icon in the
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KDE status bar that shows how much battery time you have left. It
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also will warn you when power is getting low and allows you to
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configure power saving options.
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Similar packages you may find at the
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<A
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HREF="http://www.gnome.org/"
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TARGET="_top"
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>GNOME project</A
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> . See the
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software maps at both sites.
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</P
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></LI
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><LI
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><P
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> Please see
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<A
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HREF="http://tldp.org/HOWTO/Battery-Powered/index.html"
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TARGET="_top"
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>Battery-Powered-mini-HOWTO</A
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>
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for more information.
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</P
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></LI
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><LI
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><P
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> <B
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CLASS="command"
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>toshiba-fan</B
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> Turn the fan on a Toshiba Pentium laptop on
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or off. This is a command line utility to turn the fan of a Toshiba laptop
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on or off, or view its current state. It should work on all Toshiba Pentium
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laptops that have fans.
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</P
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></LI
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></UL
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>
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</P
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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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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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HREF="ecology-howto-appendix-a-2.html"
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ACCESSKEY="P"
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>Prev</A
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></TD
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HREF="index.html"
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HREF="ecology-howto-appendix-b.html"
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ACCESSKEY="N"
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>Next</A
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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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>PCMCIA Card Services and Advanced 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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><A
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HREF="ecology-howto-appendix-a.html"
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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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>Appendix B - MP3-Hardware-Decoder at Parallel Port</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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> |