Hello,
I just ugpraded this laptop to U14.04 Trusty Tahr, and I still
experience the same symptoms (bluetooth sporadically available).
The bluetooth is not below the USB3 hub it seems:
$ lsusb -t
/: Bus 04.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/4p, 5000M
/: Bus 03.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/14p, 480M
|__ Port 3: Dev 2, If 0, Class=Human Interface Device, Driver=usbhid, 1.5M
|__ Port 5: Dev 3, If 0, Class=Wireless, Driver=, 12M
|__ Port 5: Dev 3, If 1, Class=Wireless, Driver=, 12M
|__ Port 7: Dev 4, If 0, Class=Video, Driver=uvcvideo, 480M
|__ Port 7: Dev 4, If 1, Class=Video, Driver=uvcvideo, 480M
|__ Port 8: Dev 5, If 0, Class=Vendor Specific Class, Driver=rts5139, 480M
|__ Port 10: Dev 15, If 0, Class=Human Interface Device, Driver=usbhid, 12M
/: Bus 02.Port 1: Dev 1, Class=root_hub, Driver=ehci-pci/2p, 480M
|__ Port 1: Dev 2, If 0, Class=Hub, Driver=hub/8p, 480M
/: Bus 01.Port 1: Dev 1, Class=root_hub, Driver=ehci-pci/2p, 480M
|__ Port 1: Dev 2, If 0, Class=Hub, Driver=hub/6p, 480M
$ lsusb -v
...
Bus 003 Device 003: ID 13d3:3402 IMC Networks
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 1.10
bDeviceClass 224 Wireless
bDeviceSubClass 1 Radio Frequency
bDeviceProtocol 1 Bluetooth
...
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https://bugs.launchpad.net/bugs/1260825
Title:
168c:0032 ath3k built-in bluetooth cannot load firmware - sporadic
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