About 8 months ago I installed Ubuntu 12.04 LTS on my wife's Dell Mini 9, and it was running reasonably well, apart from sometimes freezing when waking up from suspend. In an effort to speed it up a bit, I just recently replaced Ubuntu with Xubuntu 12.04 LTS. It's running better, not crashing or freezing at all. However, the power consumption is unusually high. The average at idle is about 16W, which gives about 1.5h battery life - a big difference to the usual 3-4h with Ubuntu. I estimate normal power consumption should be around 8-9W, what other Dell Mini 9 users are reporting.
In all my efforts to find what could be causing high consumption and eating the battery, I couldn't find anything. I used Powertop and Powerstat. I also tried the i915 kernel parameters that we all used since the power regression bug after v2.6, but it wasn't any better.
Does anyone have any ideas how I could find out what's eating the battery?