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$ uname -a
Linux ubuntu1110 3.0.0-14-generic-pae #23-Ubuntu SMP Mon Nov 21 22:07:10 UTC 2011 i686 i686 i386 GNU/Linux

laptop model: Lenovo W520

upon trying to enable bluetooth, the led turns on but, bluetooth is fails to get enabled in the preferences also seen below error message in dmesg

[78183.389048] usb 1-1.4: new full speed USB device number 19 using ehci_hcd
[78183.504129] bluetooth: Unknown symbol security_sk_clone (err 0)
[78183.505084] bluetooth: Unknown symbol security_sk_clone (err 0)
[78183.505189] bluetooth: Unknown symbol security_sk_clone (err 0)
[78183.505294] bluetooth: Unknown symbol security_sk_clone (err 0)
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My collegue just had this same issue on an Asus laptop after installing linux-backports-modules-cw-3.1-3.0.0-14-generic because his Bluetooth audio device would not connect (timeout). What solved the issue for him is installing the 3.2 kernel from Precise:

If you need to build out-of-tree modules (e.g. nvidia driver), you need to install two additional packages

  • Go to http://packages.ubuntu.com/precise/linux-headers-generic
  • Follow the link to the *-generic package
  • Choose a download on the amd64 or i386 page (open this in a new tab or window)
  • Follow the link to the linux-headers-* package
  • Choose a download on the amd64 or i386 page
  • Install both .deb packages

There is obviously a better way to do this, but this works for now.

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