I see the controller listed in lspic:

02:00.0 USB controller [0c03]: Etron Technology, Inc. EJ168 USB 3.0 Host 
Controller [1b6f:7023] (rev 01) (prog-if 30 [XHCI])
        Subsystem: Device [7023:1b6f]
        Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- 
Stepping- SERR- FastB2B- DisINTx+
        Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- 
<MAbort- >SERR- <PERR- INTx-
        Latency: 0, Cache Line Size: 64 bytes
        Interrupt: pin A routed to IRQ 72
        Region 0: Memory at b1b00000 (64-bit, non-prefetchable) [size=32K]
        Capabilities: <access denied>
        Kernel driver in use: xhci_hcd

However, I don't see any devices connected to that controller in lsusb.
Did you have devices connected when apport data was collected?

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https://bugs.launchpad.net/bugs/1050778

Title:
  Etron USB-3 controller problem

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