Date: Tue, 14 Jan 2003 12:24:27 -0800 (PST) From: Nate Lawson <nate@root.org> To: Wilko Bulte <wkb@freebie.xs4all.nl> Cc: cvs-all@FreeBSD.ORG, cvs-committers@FreeBSD.ORG Subject: Re: cvs commit: src/sys/dev/acpica acpi_cpu.c Message-ID: <Pine.BSF.4.21.0301141218150.39326-100000@root.org> In-Reply-To: <20030114211406.A29186@freebie.xs4all.nl>
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On Tue, 14 Jan 2003, Wilko Bulte wrote: > On Tue, Jan 14, 2003 at 02:54:13PM -0500, John Baldwin wrote: > > Albeit lying. If it were just available but not enabled, then the > > CPU wouldn't slow down when I pulled the power cord of out my laptop. > > However, when I pull the power cord out of my laptop, the CPU does > > slow down. Thus, it would seem rather obvious that CPU throttling > > is most certainly enabled and not just available. > > How does this work on desktops? I've seen one of my P2 boxes report > this throttling thing? > > Surely not the power plug being pulled out, although it slowed down > greatly when pulled ;) No, that's the manual override S5 state. ;) Throttling on non-laptop systems can only be requested by the BIOS or OS, I believe. On FreeBSD, that's via sysctl. Basically you have events coming in and actions taken. When you unplug the power on a laptop, the BIOS delivers the event to the acpi interpreter which runs the dsdt to decide what to do. That's my basic understanding. -Nate To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe cvs-all" in the body of the message
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