Date: Sat, 25 Sep 2004 10:55:12 -0700 From: Nate Lawson <nate@root.org> To: Andriy Gapon <avg@icyb.net.ua> Cc: freebsd-acpi@freebsd.org Subject: Re: acpi fan does not lower speed when CPU temp is back to low Message-ID: <4155B100.3030601@root.org> In-Reply-To: <4151AD92.8050905@icyb.net.ua> References: <1095693793.00135239.1095680401@10.7.7.3> <4151AD92.8050905@icyb.net.ua>
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Andriy Gapon wrote: > on 20.09.2004 14:38 Saulius Menkevicius said the following: > >>Is there a way to find why the ACPI code does not lower >>CPU fan speed when temperature drops back to low (as set in BIOS)? >>It does turn the speed to 100% when temperature gets high. >> >>Can it be a buggy BIOS ACPI? Though it's working fine in Windows. >> >>The motherboard is Abit IS7, desktop with a P4 2.4C. >>Running 5.3-BETA4. > > > turning fans on/off is done by OS (kernel), but it is done > through calling ACPI methods, so the problem can be in either place. > Try to take dump of your ACPI DSDT (using acpidump) and look for FAN > device section in there. You can post it to the list or send to me in > private. > If you are ineterested, you can also google for ACPI specs and download > them, they are not very hard to comperehend (but bulky). Build your acpi module with options ACPI_DEBUG. Then put this in loader.conf: hw.acpi.verbose="1" debug.acpi.layer="ACPI_THERMAL" debug.acpi.level="ACPI_LV_ALL_EXCEPTIONS" Send the dmesg output including any fan events. BTW, a lot of this info is in the acpi(4) man page and the ACPI debugging section of the handbook. -- Nate
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