Date: Thu, 08 Sep 2005 17:18:54 -0700 From: Nate Lawson <nate@root.org> To: Hajimu UMEMOTO <ume@freebsd.org> Cc: acpi@freebsd.org Subject: Re: Another acpi_thermal nit Message-ID: <4320D4EE.3020405@root.org> In-Reply-To: <yge4q8vsg59.wl%ume@mahoroba.org> References: <20050908153235.BFA955D08@ptavv.es.net> <yge4q8vsg59.wl%ume@mahoroba.org>
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Hajimu UMEMOTO wrote: >>>>>>On Thu, 08 Sep 2005 08:32:35 -0700 >>>>>>"Kevin Oberman" <oberman@es.net> said: > > > oberman> It would really be nice to be able to slow the system below where > oberman> acpi_thermal has lowered it. I just don't know if this is a matter of > oberman> code or a BIOS issue with no way out. > > Yup, I understand your needs. But, it is rather by design of > acpi_thermal. However, you can stop passive cooling by setting > hw.acpi.thermal.tz0.passive_cooling to zero even when passive cooling > is active. You can do the following step: > > 1) sysctl hw.acpi.thermal.tz0.passive_cooling=0 > 2) Set your favorite CPU speed by dev.cpu.0.freq > 3) sysctl hw.acpi.thermal.tz0.passive_cooling=1 Our acpi_thermal code switches between active and passive cooling strategies when going off battery power. So it is likely that your system only uses passive cooling so aggressively when offline. ume@'s suggestion is the best approach I think. -- Nate
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