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Path: sserve!newshost.anu.edu.au!harbinger.cc.monash.edu.au!msuinfo!gmi!zombie.ncsc.mil!MathWorks.Com!europa.eng.gtefsd.com!howland.reston.ans.net!news.sprintlink.net!uunet!news.iij.ad.jp!wnoc-tyo-news!sh.wide!kogwy!hosokawa From: hosokawa@mt.cs.keio.ac.jp (HOSOKAWA Tatsumi) Newsgroups: comp.os.386bsd.questions Subject: Re: Notebook / Laptop issues WRT: FreeBSD Date: 27 Sep 1994 04:52:54 GMT Organization: Tokoro Laboratory, Keio University, Yokohama Japan. Lines: 36 Message-ID: <3688f6$hao@kogwy.cc.keio.ac.jp> References: <hart.780152095@apanix.apana.org.au> <35rfhv$b1g@agate.berkeley.edu> NNTP-Posting-Host: nanbu.mt.cs.keio.ac.jp X-Newsreader: mnews [version 1.18PL3] 1994-08/01(Mon) In article <35rfhv$b1g@agate.berkeley.edu> jkh@violet.berkeley.edu writes: >> In article <hart.780152095@apanix.apana.org.au>, >> Leigh Hart <hart@apanix.apana.org.au> wrote: >> >How does FreeBSD 1.1-Gamma contend with the issues of power management, >> >ie: disk power-down, screen power-down, CPU sleep, CPU suspend, etc. >> >> Short answer: It doesn't. We haven't cased all the notebooks yet to >> see what sort of interrupts are generated, and what kinds of meaningful >> things to do about them. (Sorry for poor English...) I implemented APM (Advanced Power Management) BIOS driver for FreeBSD 1.1.5.1R, and my FreeBSD can control it via /dev/apm0 (Suspend/Resume, CPU idling, etc.). With this device driver, ze0 can resumed from suspended mode, kernel clock is automatically adjusted to RTC on waking up, and exports an interface for suspend/resume problems to other device drivers. This driver can also slow down the CPU clock, when the system has no activities. This feature can double the battery life and reduce only little system performance. This driver has no English documentation and tested in Japan only, but we want to prepare English documentation and distribute it more widely. If you don't mind that it has no English documentation, contact me via E-mail. If somebody outside Japan needs this driver, I will write a short English documentation for this driver and its utilities. -- HOSOKAWA, Tatsumi Tokoro Lab., Department of Computer Science, Keio University, JAPAN hosokawa@mt.cs.keio.ac.jp