我在 HP Pavilion Windows 平板电脑上安装了 Ubuntu 14.04 LTS 64 位，该平板电脑配有 Intel® Core™ i3-4030U CPU @ 1.90GHz × 4。启动 Ubuntu 后，我的 USB 鼠标无法使用。启动过程中激光会亮起，但登录屏幕出现时，激光会熄灭。我认为这显然是 USB 设备的问题，因为当我插入 USB 棒时，驱动器没有出现，并且我的 /dev/ 文件夹中只有 sda。通常我必须重新启动几次才能使 USB 设备正常工作。什么可能导致此问题？
lsusbUSB 端口不工作时的输出如下：
stefan@stefan-HP-Pavilion-13-x360-PC:~$ lsusb
Bus 001 Device 002: ID 8087:8000 Intel Corp.
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 003 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
我重新启动了系统，现在 USB 可以正常工作了。lsusb输出如下：
stefan@stefan-HP-Pavilion-13-x360-PC:~$ lsusb
Bus 001 Device 002: ID 8087:8000 Intel Corp.
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 003 Device 002: ID 2537:1081
Bus 003 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 002 Device 007: ID 0cf3:3121 Atheros Communications, Inc.
Bus 002 Device 005: ID 048d:8350 Integrated Technology Express, Inc.
Bus 002 Device 004: ID 06cb:114f Synaptics, Inc.
Bus 002 Device 003: ID 04f2:b40e Chicony Electronics Co., Ltd
Bus 002 Device 002: ID 046d:c01e Logitech, Inc. MX518 Optical Mouse
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
在总线 003 设备 002 上，空白行用于 USB 存储设备。在总线 002 设备 002 上，我们有光电鼠标。
编辑：我发现每次我启动系统时，USB 都能正常工作，方法是先在 GRUB 中启动恢复模式，然后在菜单中选择“恢复”。但是当我定期启动系统时，USB 从来不工作。
以下是正常启动后 USB 正常工作时 dmesg | grep usb 的输出：
[ 0.910332] usbcore: registered new interface driver usbfs
[ 0.910340] usbcore: registered new interface driver hub
[ 0.910364] usbcore: registered new device driver usb
[ 3.794041] usb usb1: New USB device found, idVendor=1d6b, idProduct=0002
[ 3.794043] usb usb1: New USB device strings: Mfr=3, Product=2, SerialNumber=1
[ 3.794046] usb usb1: Product: EHCI Host Controller
[ 3.794048] usb usb1: Manufacturer: Linux 3.13.0-59-generic ehci_hcd
[ 3.794049] usb usb1: SerialNumber: 0000:00:1d.0
[ 3.794635] usb usb2: New USB device found, idVendor=1d6b, idProduct=0002
[ 3.794637] usb usb2: New USB device strings: Mfr=3, Product=2, SerialNumber=1
[ 3.794639] usb usb2: Product: xHCI Host Controller
[ 3.794641] usb usb2: Manufacturer: Linux 3.13.0-59-generic xhci_hcd
[ 3.794643] usb usb2: SerialNumber: 0000:00:14.0
[ 3.796767] usb usb3: New USB device found, idVendor=1d6b, idProduct=0003
[ 3.796769] usb usb3: New USB device strings: Mfr=3, Product=2, SerialNumber=1
[ 3.796771] usb usb3: Product: xHCI Host Controller
[ 3.796773] usb usb3: Manufacturer: Linux 3.13.0-59-generic xhci_hcd
[ 3.796775] usb usb3: SerialNumber: 0000:00:14.0
[ 4.105972] usb 1-1: new high-speed USB device number 2 using ehci-pci
[ 4.238361] usb 1-1: New USB device found, idVendor=8087, idProduct=8000
[ 4.238363] usb 1-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0
[ 4.405876] usb 2-2: new low-speed USB device number 2 using xhci_hcd
[ 4.427930] usb 2-2: New USB device found, idVendor=046d, idProduct=c01e
[ 4.427932] usb 2-2: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[ 4.427933] usb 2-2: Product: USB-PS/2 Optical Mouse
[ 4.427934] usb 2-2: Manufacturer: Logitech
[ 4.428045] usb 2-2: ep 0x81 - rounding interval to 64 microframes, ep desc says 80 microframes
[ 4.436719] usbcore: registered new interface driver usbhid
[ 4.436719] usbhid: USB HID core driver
[ 4.438179] input: Logitech USB-PS/2 Optical Mouse as /devices/pci0000:00/0000:00:14.0/usb2/2-2/2-2:1.0/input/input6
[ 4.438300] hid-generic 0003:046D:C01E.0001: input,hidraw0: USB HID v1.10 Mouse [Logitech USB-PS/2 Optical Mouse] on usb-0000:00:14.0-2/input0
[ 4.593843] usb 2-3: new high-speed USB device number 3 using xhci_hcd
[ 4.691064] usb 2-3: New USB device found, idVendor=04f2, idProduct=b40e
[ 4.691066] usb 2-3: New USB device strings: Mfr=2, Product=1, SerialNumber=0
[ 4.691067] usb 2-3: Product: HP Truevision HD
[ 4.691068] usb 2-3: Manufacturer: Chicony Electronics Co., Ltd.
[ 4.809743] usb 2-4: new full-speed USB device number 4 using xhci_hcd
[ 4.827199] usb 2-4: New USB device found, idVendor=06cb, idProduct=114f
[ 4.827201] usb 2-4: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[ 4.827203] usb 2-4: Product: Synaptics Touch Digitizer V04
[ 4.827204] usb 2-4: Manufacturer: SYNAPTICS
[ 4.993674] usb 2-5: new full-speed USB device number 5 using xhci_hcd
[ 5.023015] usb 2-5: New USB device found, idVendor=048d, idProduct=8350
[ 5.023017] usb 2-5: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[ 5.023018] usb 2-5: Product: ITE Device(8350)
[ 5.023019] usb 2-5: Manufacturer: ITE Tech. Inc.
[ 5.233616] usb 2-7: new full-speed USB device number 6 using xhci_hcd
[ 5.250957] usb 2-7: New USB device found, idVendor=0cf3, idProduct=3121
[ 5.250959] usb 2-7: New USB device strings: Mfr=0, Product=0, SerialNumber=0
[ 6.632578] usbcore: registered new interface driver btusb
[ 6.691571] input: SYNAPTICS Synaptics Touch Digitizer V04 as /devices/pci0000:00/0000:00:14.0/usb2/2-4/2-4:1.0/input/input10
[ 6.691939] input: SYNAPTICS Synaptics Touch Digitizer V04 Pen as /devices/pci0000:00/0000:00:14.0/usb2/2-4/2-4:1.0/input/input11
[ 6.692311] hid-multitouch 0003:06CB:114F.0002: input,hiddev0,hidraw1: USB HID v1.11 Mouse [SYNAPTICS Synaptics Touch Digitizer V04] on usb-0000:00:14.0-4/input0
[ 6.747731] usb 2-7: USB disconnect, device number 6
[ 6.747789] usbcore: registered new interface driver ath3k
[ 6.835002] input: HP Truevision HD as /devices/pci0000:00/0000:00:14.0/usb2/2-3/2-3:1.0/input/input13
[ 6.835160] usbcore: registered new interface driver uvcvideo
[ 7.020878] usb 2-7: new full-speed USB device number 7 using xhci_hcd
[ 12.019093] WARNING: CPU: 0 PID: 183 at /build/linux-kDCE9u/linux-3.13.0/drivers/usb/host/xhci-ring.c:1581 handle_cmd_completion+0xe36/0xe40()
[ 12.019095] Modules linked in: rfcomm bnep dm_crypt nls_iso8859_1 hid_sensor_accel_3d intel_rapl snd_hda_codec_realtek hid_sensor_magn_3d x86_pkg_temp_thermal intel_powerclamp hid_sensor_gyro_3d coretemp arc4 snd_hda_codec_hdmi hid_sensor_trigger industrialio_triggered_buffer ath9k kfifo_buf kvm snd_hda_intel ath9k_common industrialio hp_wmi hid_sensor_iio_common sparse_keymap snd_hda_codec ath9k_hw snd_hwdep crct10dif_pclmul crc32_pclmul snd_pcm snd_page_alloc ghash_clmulni_intel snd_seq_midi snd_seq_midi_event uvcvideo ath aesni_intel snd_rawmidi aes_x86_64 lrw snd_seq gf128mul glue_helper videobuf2_vmalloc ablk_helper cryptd mac80211 videobuf2_memops videobuf2_core videodev hid_multitouch hid_sensor_hub cfg80211 snd_seq_device snd_timer joydev ath3k serio_raw btusb rtsx_pci_ms memstick lpc_ich bluetooth snd hp_accel parport_pc lis3lv02d mei_me soundcore ppdev hp_wireless input_polldev shpchp mei lp intel_smartconnect mac_hid parport hid_generic usbhid hid rtsx_pci_sdmmc i915 psmouse i2c_algo_bit drm_kms_helper ahci drm r8169 libahci mii rtsx_pci wmi video
[ 12.223048] usb 2-7: Device not responding to set address.
[ 12.426899] usb 2-7: device not accepting address 7, error -71
[ 12.538913] usb 2-7: new full-speed USB device number 8 using xhci_hcd
[ 12.557106] usb 2-7: New USB device found, idVendor=0cf3, idProduct=3121
[ 12.557112] usb 2-7: New USB device strings: Mfr=0, Product=0, SerialNumber=0
以下是系统重启后 USB 停止工作时的输出
[ 0.854276] usbcore: registered new interface driver usbfs
[ 0.854285] usbcore: registered new interface driver hub
[ 0.854309] usbcore: registered new device driver usb
[ 1.598769] usb usb1: New USB device found, idVendor=1d6b, idProduct=0002
[ 1.598772] usb usb1: New USB device strings: Mfr=3, Product=2, SerialNumber=1
[ 1.598774] usb usb1: Product: EHCI Host Controller
[ 1.598776] usb usb1: Manufacturer: Linux 3.13.0-59-generic ehci_hcd
[ 1.598778] usb usb1: SerialNumber: 0000:00:1d.0
[ 1.599376] usb usb2: New USB device found, idVendor=1d6b, idProduct=0002
[ 1.599378] usb usb2: New USB device strings: Mfr=3, Product=2, SerialNumber=1
[ 1.599380] usb usb2: Product: xHCI Host Controller
[ 1.599382] usb usb2: Manufacturer: Linux 3.13.0-59-generic xhci_hcd
[ 1.599384] usb usb2: SerialNumber: 0000:00:14.0
[ 1.601533] usb usb3: New USB device found, idVendor=1d6b, idProduct=0003
[ 1.601535] usb usb3: New USB device strings: Mfr=3, Product=2, SerialNumber=1
[ 1.601537] usb usb3: Product: xHCI Host Controller
[ 1.601539] usb usb3: Manufacturer: Linux 3.13.0-59-generic xhci_hcd
[ 1.601541] usb usb3: SerialNumber: 0000:00:14.0
[ 1.910642] usb 1-1: new high-speed USB device number 2 using ehci-pci
[ 2.046848] usb 1-1: New USB device found, idVendor=8087, idProduct=8000
[ 2.046850] usb 1-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0
[ 2.214575] usb 2-2: new low-speed USB device number 2 using xhci_hcd
[ 2.236207] usb 2-2: New USB device found, idVendor=046d, idProduct=c01e
[ 2.236209] usb 2-2: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[ 2.236211] usb 2-2: Product: USB-PS/2 Optical Mouse
[ 2.236212] usb 2-2: Manufacturer: Logitech
[ 2.236375] usb 2-2: ep 0x81 - rounding interval to 64 microframes, ep desc says 80 microframes
[ 2.245401] usbcore: registered new interface driver usbhid
[ 2.245402] usbhid: USB HID core driver
[ 2.246985] input: Logitech USB-PS/2 Optical Mouse as /devices/pci0000:00/0000:00:14.0/usb2/2-2/2-2:1.0/input/input6
[ 2.247108] hid-generic 0003:046D:C01E.0001: input,hidraw0: USB HID v1.10 Mouse [Logitech USB-PS/2 Optical Mouse] on usb-0000:00:14.0-2/input0
[ 2.402537] usb 2-3: new high-speed USB device number 3 using xhci_hcd
[ 2.499753] usb 2-3: New USB device found, idVendor=04f2, idProduct=b40e
[ 2.499755] usb 2-3: New USB device strings: Mfr=2, Product=1, SerialNumber=0
[ 2.499756] usb 2-3: Product: HP Truevision HD
[ 2.499757] usb 2-3: Manufacturer: Chicony Electronics Co., Ltd.
[ 2.618488] usb 2-4: new full-speed USB device number 4 using xhci_hcd
[ 2.636041] usb 2-4: New USB device found, idVendor=06cb, idProduct=114f
[ 2.636043] usb 2-4: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[ 2.636044] usb 2-4: Product: Synaptics Touch Digitizer V04
[ 2.636045] usb 2-4: Manufacturer: SYNAPTICS
[ 2.750399] usb 2-5: new full-speed USB device number 5 using xhci_hcd
[ 2.780909] usb 2-5: New USB device found, idVendor=048d, idProduct=8350
[ 2.780912] usb 2-5: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[ 2.780913] usb 2-5: Product: ITE Device(8350)
[ 2.780914] usb 2-5: Manufacturer: ITE Tech. Inc.
[ 2.990354] usb 2-7: new full-speed USB device number 6 using xhci_hcd
[ 3.007730] usb 2-7: New USB device found, idVendor=0cf3, idProduct=3121
[ 3.007732] usb 2-7: New USB device strings: Mfr=0, Product=0, SerialNumber=0
[ 4.248978] usbcore: registered new interface driver btusb
[ 4.272245] input: SYNAPTICS Synaptics Touch Digitizer V04 as /devices/pci0000:00/0000:00:14.0/usb2/2-4/2-4:1.0/input/input9
[ 4.276234] input: SYNAPTICS Synaptics Touch Digitizer V04 Pen as /devices/pci0000:00/0000:00:14.0/usb2/2-4/2-4:1.0/input/input10
[ 4.276423] hid-multitouch 0003:06CB:114F.0002: input,hiddev0,hidraw1: USB HID v1.11 Mouse [SYNAPTICS Synaptics Touch Digitizer V04] on usb-0000:00:14.0-4/input0
[ 4.309419] usbcore: registered new interface driver ath3k
[ 4.309432] usb 2-7: USB disconnect, device number 6
[ 4.333707] input: HP Truevision HD as /devices/pci0000:00/0000:00:14.0/usb2/2-3/2-3:1.0/input/input13
[ 4.333865] usbcore: registered new interface driver uvcvideo
[ 4.589670] usb 2-7: new full-speed USB device number 7 using xhci_hcd
[ 9.587952] WARNING: CPU: 0 PID: 0 at /build/linux-kDCE9u/linux-3.13.0/drivers/usb/host/xhci-ring.c:1581 handle_cmd_completion+0xe36/0xe40()
[ 9.587954] Modules linked in: rfcomm bnep dm_crypt nls_iso8859_1 snd_hda_codec_hdmi snd_hda_codec_realtek hid_sensor_gyro_3d snd_hda_intel hid_sensor_accel_3d hid_sensor_magn_3d snd_hda_codec hid_sensor_trigger snd_hwdep intel_rapl industrialio_triggered_buffer x86_pkg_temp_thermal kfifo_buf intel_powerclamp snd_pcm industrialio hid_sensor_iio_common coretemp snd_page_alloc snd_seq_midi snd_seq_midi_event kvm hp_wmi sparse_keymap snd_rawmidi crct10dif_pclmul crc32_pclmul ghash_clmulni_intel snd_seq arc4 aesni_intel ath9k aes_x86_64 lrw snd_seq_device gf128mul glue_helper ath9k_common ablk_helper snd_timer cryptd ath9k_hw uvcvideo joydev ath3k ath hid_multitouch mac80211 hid_sensor_hub serio_raw videobuf2_vmalloc btusb videobuf2_memops videobuf2_core cfg80211 videodev bluetooth rtsx_pci_ms lpc_ich memstick snd parport_pc hp_accel soundcore lis3lv02d ppdev mei_me input_polldev shpchp mac_hid mei lp intel_smartconnect hp_wireless parport hid_generic usbhid hid rtsx_pci_sdmmc i915 i2c_algo_bit psmouse drm_kms_helper ahci drm r8169 libahci mii rtsx_pci wmi video
[ 9.792000] usb 2-7: Device not responding to set address.
[ 9.995757] usb 2-7: device not accepting address 7, error -71
[ 10.107754] usb 2-7: new full-speed USB device number 8 using xhci_hcd
[ 10.125192] usb 2-7: New USB device found, idVendor=0cf3, idProduct=3121
[ 10.125197] usb 2-7: New USB device strings: Mfr=0, Product=0, SerialNumber=0
[ 10.591610] usb 2-2: USB disconnect, device number 2
[ 10.619842] usb 2-3: USB disconnect, device number 3
[ 10.647861] usb 2-4: USB disconnect, device number 4
[ 10.700509] usb 2-5: USB disconnect, device number 5
[ 10.700991] usb 2-7: USB disconnect, device number 8
在恢复模式下重新启动 Ubuntu 后，USB 可以正常工作。以下是输出：
[ 0.884428] usbcore: registered new interface driver usbfs
[ 0.884437] usbcore: registered new interface driver hub
[ 0.884462] usbcore: registered new device driver usb
[ 1.638202] usb usb1: New USB device found, idVendor=1d6b, idProduct=0002
[ 1.639480] usb usb1: New USB device strings: Mfr=3, Product=2, SerialNumber=1
[ 1.640747] usb usb1: Product: EHCI Host Controller
[ 1.642026] usb usb1: Manufacturer: Linux 3.13.0-59-generic ehci_hcd
[ 1.643272] usb usb1: SerialNumber: 0000:00:1d.0
[ 1.655741] usb usb2: New USB device found, idVendor=1d6b, idProduct=0002
[ 1.656901] usb usb2: New USB device strings: Mfr=3, Product=2, SerialNumber=1
[ 1.658054] usb usb2: Product: xHCI Host Controller
[ 1.659203] usb usb2: Manufacturer: Linux 3.13.0-59-generic xhci_hcd
[ 1.660354] usb usb2: SerialNumber: 0000:00:14.0
[ 1.668136] usb usb3: New USB device found, idVendor=1d6b, idProduct=0003
[ 1.669240] usb usb3: New USB device strings: Mfr=3, Product=2, SerialNumber=1
[ 1.670314] usb usb3: Product: xHCI Host Controller
[ 1.671369] usb usb3: Manufacturer: Linux 3.13.0-59-generic xhci_hcd
[ 1.672422] usb usb3: SerialNumber: 0000:00:14.0
[ 1.960858] usb 1-1: new high-speed USB device number 2 using ehci-pci
[ 2.093122] usb 1-1: New USB device found, idVendor=8087, idProduct=8000
[ 2.094075] usb 1-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0
[ 2.264746] usb 2-2: new low-speed USB device number 2 using xhci_hcd
[ 2.286279] usb 2-2: New USB device found, idVendor=046d, idProduct=c01e
[ 2.287263] usb 2-2: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[ 2.288227] usb 2-2: Product: USB-PS/2 Optical Mouse
[ 2.289194] usb 2-2: Manufacturer: Logitech
[ 2.290310] usb 2-2: ep 0x81 - rounding interval to 64 microframes, ep desc says 80 microframes
[ 2.301380] usbcore: registered new interface driver usbhid
[ 2.302413] usbhid: USB HID core driver
[ 2.304957] input: Logitech USB-PS/2 Optical Mouse as /devices/pci0000:00/0000:00:14.0/usb2/2-2/2-2:1.0/input/input6
[ 2.306205] hid-generic 0003:046D:C01E.0001: input,hidraw0: USB HID v1.10 Mouse [Logitech USB-PS/2 Optical Mouse] on usb-0000:00:14.0-2/input0
[ 2.456657] usb 2-3: new high-speed USB device number 3 using xhci_hcd
[ 2.553960] usb 2-3: New USB device found, idVendor=04f2, idProduct=b40e
[ 2.555002] usb 2-3: New USB device strings: Mfr=2, Product=1, SerialNumber=0
[ 2.556009] usb 2-3: Product: HP Truevision HD
[ 2.557020] usb 2-3: Manufacturer: Chicony Electronics Co., Ltd.
[ 2.676604] usb 2-4: new full-speed USB device number 4 using xhci_hcd
[ 2.693954] usb 2-4: New USB device found, idVendor=06cb, idProduct=114f
[ 2.694975] usb 2-4: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[ 2.695971] usb 2-4: Product: Synaptics Touch Digitizer V04
[ 2.696972] usb 2-4: Manufacturer: SYNAPTICS
[ 2.864508] usb 2-5: new full-speed USB device number 5 using xhci_hcd
[ 2.896486] usb 2-5: New USB device found, idVendor=048d, idProduct=8350
[ 2.897568] usb 2-5: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[ 2.898633] usb 2-5: Product: ITE Device(8350)
[ 2.899701] usb 2-5: Manufacturer: ITE Tech. Inc.
[ 3.056439] usb 2-7: new full-speed USB device number 6 using xhci_hcd
[ 3.073833] usb 2-7: New USB device found, idVendor=0cf3, idProduct=3121
[ 3.074931] usb 2-7: New USB device strings: Mfr=0, Product=0, SerialNumber=0
[ 3.763593] input: SYNAPTICS Synaptics Touch Digitizer V04 as /devices/pci0000:00/0000:00:14.0/usb2/2-4/2-4:1.0/input/input9
[ 3.766561] input: SYNAPTICS Synaptics Touch Digitizer V04 Pen as /devices/pci0000:00/0000:00:14.0/usb2/2-4/2-4:1.0/input/input10
[ 3.777290] usbcore: registered new interface driver btusb
[ 3.789046] hid-multitouch 0003:06CB:114F.0002: input,hiddev0,hidraw1: USB HID v1.11 Mouse [SYNAPTICS Synaptics Touch Digitizer V04] on usb-0000:00:14.0-4/input0
[ 3.823754] usb 2-7: USB disconnect, device number 6
[ 3.823774] usbcore: registered new interface driver ath3k
[ 3.887549] input: HP Truevision HD as /devices/pci0000:00/0000:00:14.0/usb2/2-3/2-3:1.0/input/input12
[ 3.895447] usbcore: registered new interface driver uvcvideo
[ 3.910897] Modules linked in: coretemp(+) snd_hda_intel(+) snd_hda_codec kvm_intel(-) snd_hwdep ath9k_common ath9k_hw ath kvm snd_pcm crct10dif_pclmul uvcvideo crc32_pclmul mac80211 videobuf2_vmalloc videobuf2_memops ghash_clmulni_intel videobuf2_core snd_page_alloc aesni_intel ath3k aes_x86_64 snd_seq_midi videodev lrw snd_seq_midi_event gf128mul glue_helper ablk_helper hid_sensor_hub cryptd btusb hid_multitouch snd_rawmidi cfg80211 rtsx_pci_ms bluetooth joydev snd_seq serio_raw lpc_ich memstick snd_seq_device snd_timer snd intel_smartconnect hp_wireless hp_accel lis3lv02d shpchp input_polldev mei_me soundcore mei mac_hid hid_generic usbhid hid rtsx_pci_sdmmc i915 psmouse i2c_algo_bit drm_kms_helper ahci r8169 drm libahci mii rtsx_pci wmi video
[ 4.116086] usb 2-7: new full-speed USB device number 7 using xhci_hcd
[ 9.114253] WARNING: CPU: 0 PID: 51 at /build/linux-kDCE9u/linux-3.13.0/drivers/usb/host/xhci-ring.c:1581 handle_cmd_completion+0xe36/0xe40()
[ 9.114258] Modules linked in: rfcomm bnep dm_crypt nls_iso8859_1 parport_pc ppdev lp parport hid_sensor_magn_3d hid_sensor_accel_3d hid_sensor_gyro_3d hid_sensor_trigger industrialio_triggered_buffer kfifo_buf industrialio hid_sensor_iio_common snd_hda_codec_realtek arc4 snd_hda_codec_hdmi hp_wmi sparse_keymap intel_rapl x86_pkg_temp_thermal intel_powerclamp ath9k coretemp snd_hda_intel snd_hda_codec snd_hwdep ath9k_common ath9k_hw ath kvm snd_pcm crct10dif_pclmul uvcvideo crc32_pclmul mac80211 videobuf2_vmalloc videobuf2_memops ghash_clmulni_intel videobuf2_core snd_page_alloc aesni_intel ath3k aes_x86_64 snd_seq_midi videodev lrw snd_seq_midi_event gf128mul glue_helper ablk_helper hid_sensor_hub cryptd btusb hid_multitouch snd_rawmidi cfg80211 rtsx_pci_ms bluetooth joydev snd_seq serio_raw lpc_ich memstick snd_seq_device snd_timer snd intel_smartconnect hp_wireless hp_accel lis3lv02d shpchp input_polldev mei_me soundcore mei mac_hid hid_generic usbhid hid rtsx_pci_sdmmc i915 psmouse i2c_algo_bit drm_kms_helper ahci r8169 drm libahci mii rtsx_pci wmi video
[ 9.114755] [<ffffffff81549434>] ? usb_control_msg+0xd4/0x110
[ 9.318229] usb 2-7: Device not responding to set address.
[ 9.522068] usb 2-7: device not accepting address 7, error -71
[ 9.634056] usb 2-7: new full-speed USB device number 8 using xhci_hcd
[ 9.651330] usb 2-7: New USB device found, idVendor=0cf3, idProduct=3121
[ 9.651335] usb 2-7: New USB device strings: Mfr=0, Product=0, SerialNumber=0
[ 65.649272] usb 3-1: new SuperSpeed USB device number 2 using xhci_hcd
[ 65.665515] usb 3-1: New USB device found, idVendor=2537, idProduct=1081
[ 65.665522] usb 3-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[ 65.665525] usb 3-1: Product: USB Flash Disk
[ 65.665527] usb 3-1: Manufacturer: General
[ 65.665529] usb 3-1: SerialNumber: 0169000000000307
[ 65.688454] usb-storage 3-1:1.0: USB Mass Storage device detected
[ 65.693406] scsi4 : usb-storage 3-1:1.0
[ 65.693775] usbcore: registered new interface driver usb-storage
编辑（2015年8月25日）：我发现了一些有趣的现象。每当我启动 Windows 8（USB 从未出现任何问题）时，然后重新启动并从 GRUB 菜单中选择 Ubuntu，它就会突然正常工作。Windows 下正常运行的 USB 如何在重新启动到 Ubuntu 后正常工作？
答案1
好的，通过切换到最新的 Ubuntu 版本（15.10），问题得到了解决威利)。安装 Wily 时，我还从笔记本电脑中删除了 Windows，因此现在这是一个单启动系统（如果这与问题有任何关系的话）。到目前为止，我在 Ubuntu Wily 中没有发现任何问题。