This bug still exists in 14.04. I found an answer that can solve the
problem at http://askubuntu.com/questions/217530/bluetooth-driver-not-
working-on-an-hp-pavillion-dv6-6155tx/226919#226919.
I don't understand how and why, but it works. Can anybody explain?
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Further testing:
`hcitool scan` output nothing except Scanning ...
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https://bugs.launchpad.net/bugs/1110227
Title:
Can't discover other bluetooth devices
To