Comment 4 for bug 823467

You can disable and then enable it again. This brings the bluetooth back.

I think the bug is different than what I saw before.

After the resume, the command `hcitool scan` can find the remote discoverable bluetooth devices, which means kernel is working well.

Besides this, after stopping the bluetoothd by `sudo service bluetooth stop`, the applet is not gray.

This is more likely a bug in bluez and/or gnome-bluetooth.