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I just install Powertop 1.98 on my laptop (T420 + FC15).

There is a section called "Tunables". Half of my devices shows as Bad. I see can toggle from Bad to Good? What this section is for? Why should/can toggle?

Also, is there any documention available for that app? man and google were unhelpful.

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Have you at least looked at this and this? There's a lot of information there and also google does give useful links. – rozcietrzewiacz Aug 7 '11 at 20:26
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The second link doesn't work. The first one is from an outdated website, on which I find hard to find interesting info about new kernel. It also provide no information about the tunables. I has however some info for an old version of powertop. – Olivier Toupin Aug 7 '11 at 23:22
The second link does work (at least now) - maybe there was some short outage or a problem with your connection. – rozcietrzewiacz Aug 8 '11 at 5:53
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This question is the first result in a Google search for "powertop tunables", and I can't find anything about "tunables" in either of the sites linked to above. I'm a huge fan of the StackExchange family, and a decent answer to the original question would be wonderful, though I can't provide it. – Andrew Larned Jan 26 '12 at 2:54

1 Answer

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Powertop is intended to be primarily a diagnostic tool, and the Tunables tab is there to support that.

The idea seems to be that these are hints to distributors about potential settings they could be change in their defaults, rather than hints to end users about to configure their system.

A discussion on the project's mailing list suggests that these are not (yet) documented, but that changing at least some of them is likely to have undesired results.

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