Date: Wed, 20 Aug 2003 07:40:24 +0800 From: David Xu <davidxu@FreeBSD.org> To: John Baldwin <jhb@FreeBSD.org>, Stephen Montgomery-Smith <stephen@math.missouri.edu> Cc: freebsd-current@FreeBSD.org Subject: Re: ACPI on Tyan Motherboard Message-ID: <200308200740.24284.davidxu@FreeBSD.org> In-Reply-To: <XFMail.20030819144959.jhb@FreeBSD.org> References: <XFMail.20030819144959.jhb@FreeBSD.org>
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On Wednesday 20 August 2003 02:49, John Baldwin wrote: > > Here's how it works: The BIOS/hardware monitor the power button. When an > OS tells the BIOS that it is ACPI, then the BIOS doesn't do an instant turn > off when the power button is pressed, but waits to do so until the power > button has been held down for 4 seconds. If the power button after 4 > seconds doesn't work, it's still a hardware problem. FreeBSD can not fix > your hardware problem. When you press the power button with an ACPI OS > running, the hardware sends an interrupt to the OS. The OS then shuts down > and asks the BIOS (via ACPI) to power off the machine. If the machine > doesn't physically turn off, it's because your BIOS is screwed up and > didn't handle the power down command properly. The fact that the 4 second > trick (which as above bypasses FreeBSD completely and has the BIOS call > that power down method itself) produces the same broken results means that > this bug is in your hardware. > > FreeBSD sleeps for a bit when it does a halt -p as a workaround for broken > IDE disks which claim that writes have hit the media when they are still in > the disks cache, so that is a separate issue. > > If you want more info on ACPI and how it works, feel free to head on over > to www.acpi.info and read the spec for yourself. Windows 2000 can shutdown my Tiger 230T in very short time, while FreeBSD is always timeouted with halt -p. I dont't think it is hardware or BIOS problem, FreeBSD must be wrong in something, just like FreeBSD ATA bug for my Tiger 230T, all OS I have in hand work fine, only FreeBSD does not. David Xu
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