With bluez 5.37-0ubuntu5.2 Designer keyboard still can not connect on
4.13.0-32-generic.

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https://bugs.launchpad.net/bugs/1510570

Title:
  Bluetooth LE pairing fail

Status in OEM Priority Project:
  Confirmed
Status in bluez package in Ubuntu:
  Fix Released
Status in bluez source package in Xenial:
  Fix Committed

Bug description:
  [Impact]

  When the Bluetooth adapter is not powered on it is not possible to use
  it in normal way. We used to have a hack to force powering on by using
  an udev rule but this doe snot work anymore. Luckily the BlueZ has
  introduced "AutoEnable" option that makes the stack power on adapters by
  itself.

  Backporting this to xenial will improve life of the desktop users and
  will not require them to hack the solution on their own. The fix itself
  uses the well known solution to this problem that is floating around
  there for a while.

  The upload fixes the bug by enabling the 'AutoEnable' option in the
  bluetoothd config file.

  [Original Report]

  . 15.10 we now have bluez 5 so we can pair BLE devices like the
  Microsoft Arc Touch Bluetooth Mouse.

  But this pairing doesn't work very well. Mouse is seen but pairing fail.
  More information: https://bugzilla.kernel.org/show_bug.cgi?id=104011#c5

  This is due to udev rule that use "hcitool" to power on device.
  Hopefully, bluez 5.35 has a new parameter "AutoEnable" who can be used
  instead of udev rules.

  here is a commit with this parameter:
  http://bazaar.launchpad.net/~guilhem-fr/bluez/autoenable/revision/138

  [Test Case]

  On xenial install from ppa:
  https://launchpad.net/~bluetooth/+archive/ubuntu/bluez

  Now reboot the machine. The BT adapter shall be
  powered on.

  [Regression Potential]

  If things go wrong the adapter will not be powered on after the system
  boots up. Therefore while testing please focus on the adapter state,
  i.e. powered on or off.

  [Other Info]

  This fix is included in the development release, see:
  http://bazaar.launchpad.net/~bluetooth/bluez/ubuntu-zesty/revision/22

  [What to upload]

  For xenial as in:

  ) https://launchpad.net/~bluetooth/+archive/ubuntu/bluez
  ) 
https://launchpadlibrarian.net/347480725/bluez_5.37-0ubuntu5_5.37-0ubuntu5.2~build1.diff.gz

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