Comment # 27 on bug 1082504 from Takashi Iwai

As mentioned in bug 1090458, a test kernel with the revert of the previous BT
fix is being built.
Please test that kernel later, and confirm that the problem still remains.

Once after confirmation, let's continue debugging. 
At first, try to create a file /etc/modprobe.d/90-bt-fix.conf containing the
following line:
  softdep ath3k pre: btusb

Then run mkinitrd to be sure, and retest.  Does it change the BT behavior?