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Do there exist any custom kernels that reduce power consumption, possible even geared towards laptop (e.g. 2nd gen sandybridge) users?
For instance if one uses the stock kernel vs. linux-ck, etc... are there any drastic differences in power consumption, or are most of these custom kernels geared towards performance improvements?
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actually no.
there is a patch you can apply related to aspm handling which might land up in 3.3, it should help a bit.
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I know you were looking for a customized kernel that reduces power consumption but have you looked at https://wiki.archlinux.org/index.php/Laptop_Mode_Tools ?
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