[Tfug] no cpu scaling lately on a core2 duo

JD Rogers rogersjd at gmail.com
Fri Jan 27 15:37:01 MST 2012

Sure enough, if I "watch" bios_limit, when I plug/unplug acpi, it
momentarily jumps to 2GHz and then drops back. So where is the sys
interface getting the bios limit from? Surely not the bios, because
that would not be changing, correct? I thought the BIOS setting were
basically read once on boot and were not dynamic.

On Fri, Jan 27, 2012 at 4:33 PM, JD Rogers <rogersjd at gmail.com> wrote:
>> First things first.  If you change to 'performance' do you go up to 2GHz?
> Good question. No, it stays at 1GHz. And the plot thickens, because  I
> just noticed /sys/devices/system/cpu/cpu*/cpufreq/bios_limit says
> 1GHz, but I know the bios is set to allow scaling. And again, I point
> to the fact that the speed does spike momentarily when I plug/unplug
> the AC.

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