I happened to read this a couple hours ago:

http://www.phoronix.com/scan.php?pag...tem&px=MTUzODc

Intel Developer Finds 50 Watt Power Regression In Linux
I had noticed in both Trusty and Saucy that my Intel Atom 230 ran a full 20 degrees Fahrenheit warmer than in previous versions of Ubuntu (and flavors) but I never could find a process that was consuming more resources. So, after reading that, I busted out my P3 Kill-A-Watt and sure as heck - at idle I'm still consuming nearly 17 watts in Trusty @idle whereas in Precise I'm consuming less than 3 watts