Date: Mon, 26 Apr 2004 18:47:28 -0700 From: Dave Tweten <tweten@nas.nasa.gov> To: James Snow <snow@teardrop.org> Cc: freebsd-mobile@freebsd.org Subject: Re: suspend/resume on T22 running 5.2.1 Message-ID: <381.1083030448@gilmore.nas.nasa.gov>
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Initially quoting me, snow@teardrop.org said: >>Start by creating a hibernation partition on your ThinkPad. See >> http://www.pc.ibm.com/qtechinfo/MIGR-4PESMK.html >Is this needed even if hw.acpi.s4bios=0? >I distinctly remember reading somewhere that laptop hibernation required >some kind of Windows partition in order to work, but I was unclear what >relationship that had to the value of hw.acpi.s4bios. This partition (oops, slice) is known only to the BIOS. The way hibernation works under STABLE is that the BIOS tells FreeBSD to go to sleep, and then the BIOS copies a memory image to the slice it recognizes as being good for hibernation data and turns the power off. Later, when the BIOS is in control during power-up, it recognizes hibernation status and copies the hibernation slice into memory before transferring control to it. I suppose FreeBSD 5 could duplicate the BIOS's hibernation support. Windows 2000 did that. Seems wasteful, but then so does Win2k. I can't tell you for sure, having set up hibernation for my T23 on STABLE and not on version 5. -- M/S 258-5 |1024-bit PGP fingerprint:|tweten@nas.nasa.gov NASA Ames Research Center | 41 B0 89 0A 8F 94 6C 59| (650) 604-4416 Moffett Field, CA 94035-1000| 7C 80 10 20 25 C7 2F E6|FAX: (650) 604-4377 Not an official NASA position. You can't even be certain who sent this!
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