lsusb -t result from 201307-14037, which has the same chipset but everything
works as expected. You can see here this device is on level 1, with a hub
driven by xhci_hcd driver
/: Bus 03.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/4p, 5000M
/: Bus 02.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/9p, 480M
|__ Port 3: Dev 6, If 0, Class=stor., Driver=usb-storage, 480M
|__ Port 4: Dev 2, If 0, Class=vend., Driver=, 12M
|__ Port 5: Dev 3, If 0, Class='bInterfaceClass 0x0e not yet handled',
Driver=uvcvideo, 480M
|__ Port 5: Dev 3, If 1, Class='bInterfaceClass 0x0e not yet handled',
Driver=uvcvideo, 480M
|__ Port 7: Dev 4, If 0, Class='bInterfaceClass 0xe0 not yet handled',
Driver=btusb, 12M
|__ Port 7: Dev 4, If 1, Class='bInterfaceClass 0xe0 not yet handled',
Driver=btusb, 12M
/: Bus 01.Port 1: Dev 1, Class=root_hub, Driver=ehci-pci/2p, 480M
|__ Port 1: Dev 2, If 0, Class=hub, Driver=hub/8p, 480M
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https://bugs.launchpad.net/bugs/1310558
Title:
Intel [8087:07dc] Bluetooth headset only works in A2DP mode on Dell
Latitude E5440
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