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I have seen in some version of Ubuntu that instead of making a huge change to update to the latest kernel, they take some of the good stuff out of it, for the sake of stability and put it on a previous version.

In this case, kernel 3.3 has seen some very good power management enhancements that are not all found in the kernel 3.2. My question then is: Will this updates in 3.3 be somehow pulled into the 3.2 kernel used for Ubuntu 12.04?

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up vote 15 down vote accepted

If you are referring to the fix to the infamous ASPM power regression, according to this Phoronix article the fix has already been pulled into Precise. And looking at the changelog for the current Precise kernel, the patch "pci: Rework ASPM disable code" was pulled into Ubuntu's kernel at version 3.2.0-3.9. So yes :-)

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Here is more information from the Ubuntu Kernel team on the work being done in this area:

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+1. The first link is awesome. The 2nd and 3rd are very good for information. The last one will help 12.04 a lot. – Luis Alvarado Mar 6 '12 at 15:40

If you still have problems with the "original" 12.04-kernel, hit it with the 3.3 from

I still do 11.04 and the 3.3 works for me too, so i would give it a shot.

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