This sounds like a problem with the driver. The bcm43xx driver is known to not have effective power management in it yet. (It's an immature driver.)
I would recommend giving it a whirl with ndiswrapper to confirm, but NetworkManager in edgy is currently broken with that. -- Unable to connect to network using airo_cs card https://launchpad.net/bugs/46043 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
