我拥有一个 PJP-20UR 网络会议麦克风扬声器，我已经在 Linux、Windows、Mac 上使用这个 USB 设备很长时间了，从来没有遇到过任何问题。
自从我从 Ubuntu 12.04/12.10 升级到 64 位 14.04 后，这个设备就完全不能用了。请参见下面的错误。
我该如何解决它？？？我是否总是需要回到 Ubuntu 12.04 来解决这个问题？
$ lspci
00:00.0 Host bridge: Intel Corporation 4th Gen Core Processor DRAM Controller (rev 06)
00:02.0 VGA compatible controller: Intel Corporation Xeon E3-1200 v3/4th Gen Core Processor Integrated Graphics Controller (rev 06)
00:03.0 Audio device: Intel Corporation Xeon E3-1200 v3/4th Gen Core Processor HD Audio Controller (rev 06)
00:14.0 USB controller: Intel Corporation Device 8cb1
00:16.0 Communication controller: Intel Corporation Device 8cba
00:19.0 Ethernet controller: Intel Corporation Ethernet Connection I217-V
00:1a.0 USB controller: Intel Corporation Device 8cad
00:1b.0 Audio device: Intel Corporation Device 8ca0
00:1c.0 PCI bridge: Intel Corporation Device 8c90 (rev d0)
00:1c.3 PCI bridge: Intel Corporation Device 8c96 (rev d0)
00:1c.4 PCI bridge: Intel Corporation Device 8c98 (rev d0)
00:1d.0 USB controller: Intel Corporation Device 8ca6
00:1f.0 ISA bridge: Intel Corporation Device 8cc6
00:1f.2 SATA controller: Intel Corporation Device 8c82
00:1f.3 SMBus: Intel Corporation Device 8ca2
02:00.0 Ethernet controller: Qualcomm Atheros AR8161 Gigabit Ethernet (rev 10)
03:00.0 Network controller: Intel Corporation Wireless 7260 (rev 73)
$ lsusb | grep Yamaha
Bus 003 Device 004: ID 0499:4018 Yamaha Corp.
$ tail -f /var/log/kern.log
Aug 6 11:26:09 e300 kernel: [ 1040.906550] xhci_hcd 0000:00:14.0: xHCI xhci_drop_endpoint called with disabled ep ffff8800369e8b00
Aug 6 11:26:09 e300 kernel: [ 1040.906553] xhci_hcd 0000:00:14.0: Trying to add endpoint 0x81 without dropping it.
Aug 6 11:26:09 e300 kernel: [ 1040.906555] usb 3-9: Not enough bandwidth for altsetting 1
Aug 6 11:26:09 e300 kernel: [ 1040.906556] 4:2:1: usb_set_interface failed (-22)
$ dmesg
[ 1040.906553] xhci_hcd 0000:00:14.0: Trying to add endpoint 0x81 without dropping it.
[ 1040.906555] usb 3-9: Not enough bandwidth for altsetting 1
[ 1040.906556] 4:2:1: usb_set_interface failed (-22)