I have a similar problem with an HP NX6125 laptop I use NetworkManager, and sometimes I can solve it right-clicking it and disabling and reenabling the wireless network. Sometimes though I really have to reload the bcm43xx kernel module for it to work again.
-- bcm43xx needs manual treatment after resume https://launchpad.net/bugs/38329 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
