I’m a relative Linux newbie, pretty much worked with MS. But we just got new workstations with Ubuntu installed, I also have dual boot w/Windows and Ubuntu on my personal laptop.
The one thing that bothers me about Ubuntu, and I even remember another Freeper mentioning this, is that for some reason, my laptop heats up more significantly when running under Ubuntu. I don’t know why, or if it’s something in the BIOS is need to set. If I close my laptop with XP, and put the laptop away for awhile, it will be cool when I open it back it, but with Ubuntu, it will stay hot, even when it is hibernating.
Never having worked with Ubuntu my first guess would be the APS service is not configured right..
Some hints are here:
http://foodfight.org/log/Hardware/laptop-running-hot.html