Martin, for whatever it's worth, the following upower bug I filed might also be related - since an idle nexus 7 has a longer battery life than 20 hours, one would hope.
https://bugs.freedesktop.org/show_bug.cgi?id=60110 Cheers, Alex ** Bug watch added: freedesktop.org Bugzilla #60110 https://bugs.freedesktop.org/show_bug.cgi?id=60110 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1093543 Title: Battery status behaves erratically To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu-nexus7/+bug/1093543/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs