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35a32c5
(Get the code!)
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Colin King spent some days doing extensive and accurate power benchmarking [1], amongst others the effect of the pm-utils power.d scripts on various machines [2].
It turns out that the readahead and the journal-commit scripts do not actually save power these days (maybe they did at the time when they got introduced, but changes in the kernel nullified them?). No measurable difference on HDD, and on SSD power usage increases by 1.5%. This was confirmed on an idle system, on a system doing compiling/package build, and a workload with music playback and browsing, each 5 times over 60 minutes.
Based on this it seems that these scripts should be disabled by default or removed.
[1] http://
[2] http://