Date: Fri, 30 May 2003 16:32:36 +0100 From: Bruce Cran <bruce@cran.org.uk> To: "Sebastian Yepes [ESN]" <esn@x123.info> Cc: current@freebsd.org Subject: Re: ?full cpuspeed? Message-ID: <20030530153236.GB16758@fourtytwo.brucec.backnet> In-Reply-To: <200305301352.16822.esn@x123.info> References: <200305301352.16822.esn@x123.info>
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On Fri, May 30, 2003 at 01:52:16PM +0000, Sebastian Yepes [ESN] wrote: > Hi all i have a Dell inspiron 8500 Notebook that have SpeedStep > when i am on AC power i just love my notebook, but when i gen on Battery > i can't even see a dvd & and my X run verry slow.. > > is there and way to force fbsd to use 'hw.acpi.cpu.current_speed=8' when i am > on battery.. by the way 'hw.acpi.cpu.current_speed' is read only.. > > -- sysctl -- > > --AC Power-- > hw.acpi.cpu.max_speed: 8 > hw.acpi.cpu.current_speed: 8 > hw.acpi.cpu.performance_speed: 8 > hw.acpi.cpu.economy_speed: 4 > > --Battery Power-- > hw.acpi.cpu.max_speed: 8 > hw.acpi.cpu.current_speed: 4 > hw.acpi.cpu.performance_speed: 8 > hw.acpi.cpu.economy_speed: 4 > There are two possible problems here. If you power on on AC and switch over to battery, you can set the hw.acpi.cpu.economy_speed to 8 to get the full CPU speed. If you power on using battery though, Dell have made it so you'll only ever be able to use 60% CPU speed, regardless if you later switch to AC. For example, my 2.0GHz i8500 boots up as 1.2GHz and is detected as such by FreeBSD. The economy_speed sysctl will then throttle it further to 600MHz. -- Bruce Cran
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