From owner-freebsd-current@FreeBSD.ORG Wed Aug 20 10:24:40 2003 Return-Path: Delivered-To: freebsd-current@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id C9B4316A4C0 for ; Wed, 20 Aug 2003 10:24:40 -0700 (PDT) Received: from mail.speakeasy.net (mail14.speakeasy.net [216.254.0.214]) by mx1.FreeBSD.org (Postfix) with ESMTP id 10A6543FA3 for ; Wed, 20 Aug 2003 10:24:39 -0700 (PDT) (envelope-from jhb@FreeBSD.org) Received: (qmail 11719 invoked from network); 20 Aug 2003 17:24:38 -0000 Received: from unknown (HELO server.baldwin.cx) ([216.27.160.63]) (envelope-sender )encrypted SMTP for ; 20 Aug 2003 17:24:38 -0000 Received: from laptop.baldwin.cx (gw1.twc.weather.com [216.133.140.1]) by server.baldwin.cx (8.12.9/8.12.9) with ESMTP id h7KHOa9s094820; Wed, 20 Aug 2003 13:24:36 -0400 (EDT) (envelope-from jhb@FreeBSD.org) Message-ID: X-Mailer: XFMail 1.5.4 on FreeBSD X-Priority: 3 (Normal) Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 8bit MIME-Version: 1.0 In-Reply-To: <200308200740.24284.davidxu@FreeBSD.org> Date: Wed, 20 Aug 2003 13:24:59 -0400 (EDT) From: John Baldwin To: David Xu cc: freebsd-current@FreeBSD.org cc: Stephen Montgomery-Smith Subject: Re: ACPI on Tyan Motherboard X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: Discussions about the use of FreeBSD-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 20 Aug 2003 17:24:41 -0000 On 19-Aug-2003 David Xu wrote: > 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. In this case, David, the machine still screws up even with the hardware 4 second override. FreeBSD has no possible control over the override, that is _only_ handled in hardware and the BIOS. -- John Baldwin <>< http://www.FreeBSD.org/~jhb/ "Power Users Use the Power to Serve!" - http://www.FreeBSD.org/