Date: Wed, 5 May 2004 10:45:37 -0700 (PDT) From: Nate Lawson <nate@root.org> To: Christian Uhrhan <christian.uhrhan@gmx.de> Cc: acpi@freebsd.org Subject: Re: ACPI is not working Message-ID: <20040505104315.N35684@root.org> In-Reply-To: <9812.1083740254@www17.gmx.net> References: <20040504222314.O32088@root.org> <9812.1083740254@www17.gmx.net>
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On Wed, 5 May 2004, Christian Uhrhan wrote: > > You can put that in /etc/sysctl.conf if it works ok. Make sure it works > > before doing that though. It should lower the temps with no real > > performance hit (unlike throttling). > > thx very much, after rebooting the fan slowed down and then came back to > full speed. after setting hw.acpi.cpu.cx_lowest to 1 and a few more > seconds it slowed down again and it is working (at the moment i will > obeye it for a while before add it to /etc/sysctl.conf as you told me) > under X too. Good. That should be fine. > > Your system does not support throttling. It has a 0 for duty_width. > > However, it does support ACPI performance states so once the driver is > > finished for those, you will be able to step back your clock to save > > power/heat. That's a different and better mechanism than throttling > > anyway. > > hmmm...i guess i missunderstood something. isn't throttling == stepping > back the cpu speed (for instance from 1000MHz to 500MHz)? > > thank you for looking at my problem and thanks that you invested some > time to help me Throttling does step back the effective CPU speed by triggering the CPU clock at some fraction of the actual clock. See a previous post I made for more techical details. As Bruno said, you have a mobile athlon and so powernow or acpi performance states will provide clock/voltage control. I haven't finished the drivers for that for FreeBSD yet but his driver should help you if you want to try it. Clock/voltage control is similar but different than throttling. -Nate
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