Date: Mon, 3 May 2004 00:15:16 +0200 From: Peter Schuller <peter.schuller@infidyne.com> To: freebsd-mobile@freebsd.org Cc: Markie <mark.cullen@dsl.pipex.com> Subject: Re: Laptop ACPI question Message-ID: <200405030015.16417.peter.schuller@infidyne.com> In-Reply-To: <20040502220115.BBA985D0A@ptavv.es.net> References: <20040502220115.BBA985D0A@ptavv.es.net>
next in thread | previous in thread | raw e-mail | index | archive | help
> SpeedStep, as I understand it, is adjustment of the CPU clock speed and > is VERY directly tied to battery life. It is what systems supporting > SpeedStep adjust when moving from AC to battery modes. E.g. my T30, by > default, runs at 1.8 GHz on AC and 1.2 GHz on battery (with my BIOS > configuration). SpeedStep is a marketing name and I am unwilling to say > that it is limited to the CPU speed. It may include some of the other > power management tools like deep sleep modes. Ah, okay. In that case it seems to be party supported already (on 5.2, I think even 5.1). Or if not SpeedStep, then some alternative to it. On the T40p I am able to control the speed of the CPU in performance/economy mode by modifying sysctl variables. (Though I am actually running with APM since ACPI causes hangs - though I'm just about to try it on CURRENT.) > Support of CPU frequency is something that is actively being developed > and will almost certainly be in 5.3. PCI power mode support is also in > active development and was committed to CURRENT a few weeks ago, but at > least partly backed out due to problems on a few laptops. (It worked > GREAT on mine, though). I hope it is returned soon as it make my sound > work after a suspend. I remember reading about the PCI stuff and the DPMS/screen poweroff issue on -current. But I must have missed the part about it involving power saving, I thought it was just bug/crash fixes. > So power management is getting closer all the time and I am pretty > confident (for someone who is NOT writing the code) that it will all be > ready when V5 is declared STABLE. Looking forward to a 5-STABLE regardless :) Thanks! -- / Peter Schuller, InfiDyne Technologies HB PGP userID: 0xE9758B7D or 'Peter Schuller <peter.schuller@infidyne.com>' Key retrieval: Send an E-Mail to getpgpkey@scode.org E-Mail: peter.schuller@infidyne.com Web: http://www.scode.org
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?200405030015.16417.peter.schuller>