I have the same issue on 2.6.38-8. If I go to battery, the connection indicator doesn't change but the connection becomes really slow. So, following Wolfgang's suggestion, I installed 2.6.39-999 201104191714, and apparently the problem's solved.
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/734865 Title: [STAGING] RT2860 Wireless will not authenticate and connect when on battery power. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs