[gentoo-user] Throttling State won't change from command in Gentoo Power Management Guide

[gentoo-user] Throttling State won't change from command in Gentoo Power Management Guide

[Richard Watson]

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Hi - I've been setting my laptop for power management by following the Power Management Guide and have successfully got cpufreqd running. However the CPU still gets hot on large compiles. I thought maybe changing the throttling state would cool things off but when I run the command from the power management guide 

echo -n "0:T1" > /proc/acpi/processor/C000/limit 

it returns the error 

-bash: echo: write error: Invalid argument

I tried opening the file with nano -w and got the same message when saving the changes. Can anybody give me any help? 

Thanks, Richard

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Re: [gentoo-user] Throttling State won't change from command in Gentoo Power Management Guide

[Tobias Heinzen]

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Hi Richard

I assume you've got the cpufreq-utils installed and running. What you
can do is (as root):

$cpufreq-info

This will give you some information about your CPU. It looks something
like this:

cpufrequtils 0.4: cpufreq-info (C) Dominik Brodowski 2004
Report errors and bugs to linux@brodo.de, please.
analyzing CPU 0:
  driver: centrino
  CPUs which need to switch frequency at the same time: 0
  hardware limits: 800 MHz - 1.87 GHz
  available frequency steps: 1.87 GHz, 1.60 GHz, 1.33 GHz, 1.07 GHz, 800 MHz
[snip]

The most interesting part is "avaiable frequency steps".

Now you can change the upper bound to a lower level with

$cpufreq-set -u 800000

This will set the upper bound to 800MHz. This means you're CPU can't get
"faster" as this. I've you need more, you simply change the upper bound.

Another battery saving tip: set the powermode of your GPU lower and you
will get another 20-30 minutes ;)

I hope this will help. This is my way of throttling the power. Isn't as
nice as the power managment guide says, but it works :-)

Richard Watson wrote:
> Hi - I've been setting my laptop for power management by following the
> Power Management Guide and have successfully got cpufreqd running.
> However the CPU still gets hot on large compiles. I thought maybe
> changing the throttling state would cool things off but when I run the
> command from the power management guide
>
> echo -n "0:T1" > /proc/acpi/processor/C000/limit
>
> it returns the error
>
> -bash: echo: write error: Invalid argument
>
> I tried opening the file with nano -w and got the same message when
> saving the changes. Can anybody give me any help?
>
> Thanks, Richard
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Re: [gentoo-user] Throttling State won't change from command in Gentoo Power Management Guide

[Tobias Heinzen]

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Hi Richard

You can also throttle the speed of your CPU with the command

$cpufreq-set -u 800000

This will set the upper bound to 800MHz, meaning your CPU won't be going
any faster than those 800MHz. This is the way I am doing it. Not very
nice but it works for me.

Richard Watson wrote:
> Hi - I've been setting my laptop for power management by following the
> Power Management Guide and have successfully got cpufreqd running.
> However the CPU still gets hot on large compiles. I thought maybe
> changing the throttling state would cool things off but when I run the
> command from the power management guide
>  
> echo -n "0:T1" > /proc/acpi/processor/C000/limit
>  
> it returns the error
>  
> -bash: echo: write error: Invalid argument
>  
> I tried opening the file with nano -w and got the same message when
> saving the changes. Can anybody give me any help?
>  
> Thanks, Richard


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Re: [gentoo-user] Throttling State won't change from command in Gentoo Power Management Guide

[Richard Watson]

Hi Tobias

$cpufreq-set -u 800000 worked great but I finally settled on $cpufreq-set -g
ondemand.

Good tip, thanks Richard

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