I've installed Ubuntu 13.10 in my laptop, an ASUS S56CB, also called ASUS K56CB in other countries.
My first problem is the power consumption. In Windows 8 I get 4h30min viewing video with all switched off and 25% brightness. In Ubuntu I get
3h with all off and
5% brightness. On normal use, surfing and other stuff, I get
3h45min in Windows and a surprising
1h50min in Ubuntu. I can live with the same or a bit less autonomy than Windows, but this goes to the half than the Microsoft SO.
The other problem is installing the drivers. I've installed several drivers from different sources, from the official page of Nvidia and from a couple of PPAs through Bumblebee and other stuff like that. The laptop now works great, and I don't care much about the drivers of the graphic card because the HD4000 gives me simple acceleration for CCSM and Unity.
The question is if the high power consumption can be anormaly high due to the graphic card, because if the GPU don't have the drivers, the SO can administrate it good and wastes a lot of energy. By now, writing this and listen in spotify, the laptop consumes
EDIT1: CPUFreq, as I think, works good and yes, I try tlp mode.