Date: Tue, 19 Aug 2003 13:01:30 -0500 From: Stephen Montgomery-Smith <stephen@math.missouri.edu> To: freebsd-current@freebsd.org Subject: Re: ACPI on Tyan Motherboard Message-ID: <3F4265FA.2070607@math.missouri.edu> In-Reply-To: <XFMail.20030819131444.jhb@FreeBSD.org> References: <XFMail.20030819131444.jhb@FreeBSD.org>
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John Baldwin wrote: > On 19-Aug-2003 Stephen Montgomery-Smith wrote: > >>I am guessing that this 4 second delay is part of how FreeBSD wants it. If that >>is the case, it shows that the power button is working as it should - it is the >>power-down process that is not working right. > > > No, the 4 second countdown thing is in the BIOS/hardware and is not OS > dependent at all. If the box doesn't properly shut off when you hold > the power button for 4 seconds, that is a hardware or BIOS bug and > something FreeBSD has no control over. > FreeBSD must have some control over this process, because in FreeBSD-4.8 and RedHat 9.0 (which make no attempt to access ACPI), the power button immediately powers down the computer. The same is also true if I start FreeBSD-current with ACPI support switched off. (Windows 2000 also works fast, but the Windows 2000 OS first cleanly shuts down the file system.) But now that people are mentioning this 4 second issue, I have now also noticed that if I do "halt -p" under FreeBSD-current, the OS does all its shutdown stuff, prints the message "Uptime xxxxx", and then waits about 4 seconds before doing its powerdown attempt. -- Stephen Montgomery-Smith stephen@math.missouri.edu http://www.math.missouri.edu/~stephen
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