Underclock/ reduce processor speed etc

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Underclock/ reduce processor speed etc

Postby nathanjh13 on Mon Jan 13, 2014 5:29 pm

My laptop seems to run rather warm and my battery doesn't last so long (it's possible I need a new battery I know).

Is it sensible to "underclock" in such circumstances? It's a quad core i7 Dell Inspiron. The processor entry under System Informations shows the following. One of them looks "wrong"?

Thanks
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Re: Underclock/ reduce processor speed etc

Postby dagon on Mon Jan 13, 2014 7:03 pm

Is it sensible to "underclock" in such circumstances? It's a quad core i7 Dell Inspiron. The processor entry under System Informations shows the following. One of them looks "wrong"?

It doesn't look like the CPU is pulling a big load.
Which laptop is it more precisely?
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Re: Underclock/ reduce processor speed etc

Postby perham on Tue Jan 14, 2014 12:13 pm

nathanjh13 wrote:My laptop seems to run rather warm and my battery doesn't last so long (it's possible I need a new battery I know).

Is it sensible to "underclock" in such circumstances? It's a quad core i7 Dell Inspiron. The processor entry under System Informations shows the following. One of them looks "wrong"?

Thanks


the power consumption does not act linear with clock frequency. there are a lot of other factors involved. underclocking would not have any significant effect on heat or consumption.
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Re: Underclock/ reduce processor speed etc

Postby nathanjh13 on Wed Jan 22, 2014 5:50 pm

@dagon
Thanks. It's a Dell Inspiron N5110 i7-2670QM@2.2Ghz with a 128Gb SSD and 4Gb RAM

@perham
That's a good point, good call there.

All I can add is that the area to the left of the trackpad, where the internal copper strip/heat sink goes to the fan, it does get pretty hot sometimes (I know it's expected in that area). I just can't think why it would be running so hot/losing battery so quickly.

Anything else I should keep an eye on?
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Re: Underclock/ reduce processor speed etc

Postby Tz2001 on Thu Jan 23, 2014 2:59 pm

Don't quote me on this, but from what I've read, (fairly modern) intel chips will run at lower clock speeds when idle anyway. Whether underclocking will have any affect on how low this goes, I have no idea.
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Re: Underclock/ reduce processor speed etc

Postby trapperjohn on Thu Jan 23, 2014 4:50 pm

I use cpupower. In the file /etc/default/cpupower is a commented option for max_frequency.

Setting this value to a frequency below top-end has helped me with an certain overheating laptop. This laptop is used almost exclusively for videos. We have not noticed any performance compromise with scaling.
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