I have dell xps 15 with nvidia 525 with optimus. I use ironhide for optimus support. Under normal conditions I can see 2000+ processor wake ups. As a result of which my battery dries up rapidly. In windows I get almost 4 hours back up and in ubuntu I hardly get 2+ hours battery backup. I'm not able to identify what the problem is. I'm using ubuntu 11.10 32-bit. Please help to resolve my issue.