ok now my kernel parameters look like this:

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash pcie_aspm=force
i915.i915_enable_rc6=1"

and the power consumption is down to 24W(from 29W) in IDLE. Thank you so
far.

But nevertheless the outcome of this is a battery lifetime just under
two hours. That's better than before (1,5h) but not nearly as good as in
windows7.

I thank you for your effort and hope there are more options for tuning.

Greets Felix

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https://bugs.launchpad.net/bugs/876854

Title:
  high power consumption on Asus X4GS(N43SN)

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