@everyone, the "Loading patch file failed" error is definitely caused by
ath3k incompatibility with USB 3.0. The ath3k driver fails to work
approximately 2/3 of the time if btusb is connected to a pin which uses
the xhci driver. I compiled a dkms kernel package, with the very
extensive help of AceLan Kao, which switches the usb pin of the bt
device to ehci. Now ath3k and my bluetooth works like a charm 100% of
the time. However this is just a workaround, I will report this issue
upstream but it looks like the devs are not really  interested in fixing
this, because it already got reported before.

@Christopher, could you cherry pick the device id patch for my bluetooth
card and backport it to saucy and trust? It is upstream since 3.14-rc1
[0][1] and I don't want to be forced to use the Ubuntu mainline kernel
all the time.

[0] 
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/drivers/bluetooth/ath3k.c?id=35580d223b6b04d9a570e4fe377c46a102413fe8
[1] 
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/drivers/bluetooth/btusb.c?id=35580d223b6b04d9a570e4fe377c46a102413fe8

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https://bugs.launchpad.net/bugs/1237296

Title:
  168c:0036 [Acer Aspire E1-572] ath9k QCA9565/AR9565/QCWB335 Bluetooth
  works sporadic

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