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"I got a special version of Ubuntu, with some kernel patches, and some patched packages for sleep and hibernation."

What version of Ubuntu is this hardware specific patched one?

Are Canonical or Dell guranteeing updates? If so, for how long...

Best of luck with it.

All the custom stuff is in a PPA[1]. Some of the patches are already merged into Quantal.

Good work, especially the practice of merging the patches into main kernel.