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I have Kubuntu 13.04 installed. KDE uses powerdevil to manage hibernate/sleep, which in turns seems to use pm-utils backend. pm-utils is unmaintained, and broken at this point1. For example, I had to jump through many hoops to just enable in-kernel hybrid suspend which has been present since kernel 3.6.

I asked on Freenode #kde, and it seems like KDE powerdevil has been modified to accept newer backends for a while now. The order of preference is roughly systemd-login1, upower, and Solid.

Does anyone know what power backed will *buntu 13.10 use?

1 The pm-utils code was last updated in 2010, and they have not been accepting patches.

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The latest version of pm-utils seems to be "06 Nov 2013" from this changelog.

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