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1<?xml version='1.0' encoding="UTF-8"?> 1<?xml version='1.0' encoding="UTF-8"?>
2<!DOCTYPE guide SYSTEM "/dtd/guide.dtd"> 2<!DOCTYPE guide SYSTEM "/dtd/guide.dtd">
3<!-- $Header: /var/cvsroot/gentoo/xml/htdocs/doc/en/power-management-guide.xml,v 1.20 2006/07/27 08:23:01 rane Exp $ --> 3<!-- $Header: /var/cvsroot/gentoo/xml/htdocs/doc/en/power-management-guide.xml,v 1.21 2006/08/17 00:45:29 rane Exp $ -->
4<guide link="/doc/en/power-management-guide.xml"> 4<guide link="/doc/en/power-management-guide.xml">
5<title>Power Management Guide</title> 5<title>Power Management Guide</title>
6 6
7<author title="Author"> 7<author title="Author">
8 <mail link="earthwings@gentoo.org">Dennis Nienhüser</mail> 8 <mail link="earthwings@gentoo.org">Dennis Nienhüser</mail>
61sections will work. This includes BIOS settings, kernel configuration and some 61sections will work. This includes BIOS settings, kernel configuration and some
62simplifications in user land. The following three chapters focus on devices 62simplifications in user land. The following three chapters focus on devices
63that typically consume most energy - processor, display and hard drive. Each 63that typically consume most energy - processor, display and hard drive. Each
64can be configured seperately. <uri link="#doc_chap3">CPU Power Management</uri> 64can be configured seperately. <uri link="#doc_chap3">CPU Power Management</uri>
65shows how to adjust the processor's frequency to save a maximum of energy 65shows how to adjust the processor's frequency to save a maximum of energy
66whithout losing too much performance. A few different tricks prevent your hard 66without losing too much performance. A few different tricks prevent your hard
67drive from working unnecessarily often in <uri link="#doc_chap5">Disk Power 67drive from working unnecessarily often in <uri link="#doc_chap5">Disk Power
68Management</uri> (decreasing noise level as a nice side effect). Some notes on 68Management</uri> (decreasing noise level as a nice side effect). Some notes on
69graphics cards, Wireless LAN and USB finish the device section in <uri 69graphics cards, Wireless LAN and USB finish the device section in <uri
70link="#doc_chap6">Power Management For Other Devices</uri> while another 70link="#doc_chap6">Power Management For Other Devices</uri> while another
71chapter is dedicated to the (rather experimental) <uri link="#doc_chap7">sleep 71chapter is dedicated to the (rather experimental) <uri link="#doc_chap7">sleep
522 522
523<p> 523<p>
524The above is quite nice, but not doable in daily life. Better let your system 524The above is quite nice, but not doable in daily life. Better let your system
525set the appropriate frequency automatically. There are many different 525set the appropriate frequency automatically. There are many different
526approaches to do this. The following table gives a quick overview to help you 526approaches to do this. The following table gives a quick overview to help you
527decide on one of them. It's roughly seperated in three categories <b>kernel</b> 527decide on one of them. It's roughly separated in three categories <b>kernel</b>
528for approaches that only need kernel support, <b>daemon</b> for programs that 528for approaches that only need kernel support, <b>daemon</b> for programs that
529run in the background and <b>graphical</b> for programs that provide a GUI for 529run in the background and <b>graphical</b> for programs that provide a GUI for
530easy configuration and changes. 530easy configuration and changes.
531</p> 531</p>
532 532
1135none /tmp tmpfs size=32m 0 0 1135none /tmp tmpfs size=32m 0 0
1136</pre> 1136</pre>
1137 1137
1138<warn> 1138<warn>
1139Pay attention to the size parameter and modify it for your system. If you're 1139Pay attention to the size parameter and modify it for your system. If you're
1140unsure, don't try this at all, it can become a perfomance bottleneck easily. In 1140unsure, don't try this at all, it can become a performance bottleneck easily. In
1141case you want to mount <path>/var/log</path> like this, make sure to merge the 1141case you want to mount <path>/var/log</path> like this, make sure to merge the
1142log files to disk before unmounting. They are essential. Don't attempt to mount 1142log files to disk before unmounting. They are essential. Don't attempt to mount
1143<path>/var/tmp</path> like this. Portage uses it for compiling... 1143<path>/var/tmp</path> like this. Portage uses it for compiling...
1144</warn> 1144</warn>
1145 1145

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