sudo apt-get install powertop
Other people report it too, not much help in certain faq-like forums.
I'd check first of all if it's related to the power regression issue 3.4-3.5, it seems to affect other Lenovos too (related to some very old chips in those new systems). Try running
powertop after killing X to see if it is graphics related. It could also be connected to RC6-states not being activated like they should.
Don't use conservative CPU scheduler, on-demand is recommended as the appropriate by Intel and all other authoritative sources. The names are a bit misleading, just run on-demand on such a laptop.
This laptop has both the discrete Intel GPU and an Nvidia GPU, try deactivating one of them and check for power consumption.
I advise you to create a proper bug report for this issue instead of using askubuntu.com - most advice in here is not so qualified. Such a large power consumption as in the U410 on Ubuntu current is not an issue of tweaking power settings - it signifies some actual defect somewhere. Relatedly, do you also experience issues with the built-in microphone?