Messages in this thread | | | From | (Måns Rullgård) | Subject | Re: Selecting CPU frequency on Asus P4M laptop | Date | Thu, 27 Nov 2003 18:48:59 +0100 |
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mru@kth.se (Måns Rullgård) writes:
> I have an Asus M2E laptop with a 1.8 GHz P4M CPU. Using the 'acpi' > cpufreq driver, I can select between 1.8 GHz and 1.2 GHz, thereby > changing the power consumption. If I boot the machine with the AC > adapter disconnected, it starts off at 1.2 GHz. After that, I can > lower it to 800 MHz using cpufreq. In short, cpufreq will be able to > choose among one of two pairs of frequencies, which depend on the > status of the AC adapter at boot time. > > Is there any way to change which of these will be used after booting?
Update:
I ran a speed test, "openssl speed", in the various modes, and it gave the same results whichever way the machine was booted. It appears to be reporting/detecting incorrect values when the AC adapter is unplugged. Switching speeds with cpufreq does change the actual speed of the CPU.
-- Måns Rullgård mru@kth.se
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