Re: Can't set CPU freuqency

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Colin Fletcher <colin.m.fletcher@xxxxxxxxxxxxxx> writes:

> Could be "turbo" mode? The CPU is clocked at a speed that'll cause it
> to run too hot if fully loaded, and throttled back when the
> temperature rises. You can see the current state, and turn it off &
> on, via:
>
>     /sys/devices/system/cpu/intel_pstate/no_turbo
>
> Write '0' there to enable turbo mode, '1' to disable it. Disabling it
> makes my laptop run a lot cooler.
>
> Attached the tiny shell script I use to see & change the setting, in
> case that's useful.

When the module thinkpad_acpi (I suspect dependent on laptop type) is
loaded with the option fan_control=1 you can do things like

echo level 7|sudo tee /proc/acpi/ibm/fan

or

echo level disengaged|sudo tee /proc/acpi/ibm/fan

(the last one is the loudest and fastest) in order to set a particular
fan speed.

echo level auto|sudo tee /proc/acpi/ibm/fan

resets to temperature-based.

My laptop has a thermal design power of 35W and my CPU of 45W, so if I
am doing heavy computations, I tend to crank the fan up in advance
because it will underestimate where it has to go for a given
temperature.

-- 
David Kastrup
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