There are many reports from users about high xorg CPU load when using themes like: Ambiance, Radiance, Dust, Human and Impression. Clearlooks is the only theme which consumes lowest power.
One of the reported bug: Bug #595845 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/760131 Title: Power consumption raised significantly in natty To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu-release-notes/+bug/760131/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
