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cpu won't stay in powersave mode

DISCUSSION Tom Bruno 1 participant 1 message Dec 15, 2003

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Tom Bruno

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I'm in the process of writing an acpi daemon that will also take care of cpufreq settings.

I have found that unless I set /sys/device/system/cpu/cpu0/cpfreq/scaling_governer
to powersave from the command line that /proc/cpuinfo will not change
and the speed will not stay at powersave speeds.

With other programs like cpufreqd, using a cpu speed test posted on this list, i have found that the cpu speed does indeed change even though /proc/cpuinfo does not.

However, i have found that after about 8-10 seconds the cpu test starts reporting that the cpu is back to full speed even though the powersave value is still in scaling_governer.

Like i said above if I change it via hand using echo, /proc/cpuinfo is correct, and the cputest reports the correct speed constantly.

performance mode: 2.4ghz
powersave mode: 1.2ghz
Intel P4-M 2.4ghz
Dell Inspiron 8500 - Bios A05
kernel-2.6.0-test11

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