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I have 10.10 installed on my MacBook Pro, and I can confirm the 1-5 are no longer an issue :) (resuming from sleep takes at least 2-3 times longer for me than on OS X though). I don't know enough to confirm 6, but if that is also covered then 7 should be as well.

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Does Linux still consumes more battery power than MacOSX?

I had this issue in the past on my MacBook. It was very notable: on Linux the total battery time was about 60-70% of what I had with MacOSX.

I did some debugging and while the kernel itself also consumed slightly more than MacOSX, the biggest problem where the applications, esp. the window manager (tested both Gnome and KDE). They do a lot of stuff and mostly prevent the CPU from going into low-power mode or wake it up all the time.

Not so sure about that. I recently put Ubuntu on a low end Acer laptop - the kind that's been around for years - and still had problems with a lot of things.

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