我以前可以毫无问题地插入和拔出 USB 耳机。我偶尔不得不使用设置的“声音”部分将设备重置回我的耳机，但仅此而已。今天，我无法让它们工作，插拔几次后，它们不再出现在设备列表中。
我运行 udevadm 监视器，然后将它们插入以查看发生了什么（见下文），但看起来好像设备已被添加，但随后立即被删除。它们通过集线器连接，但我认为这没有什么区别，除了给我们更多的输出来拖网:-(
有什么想法吗？
john@StudyPC:~$ udevadm monitor --udev
monitor will print the received events for:
UDEV - the event which udev sends out after rule processing
UDEV [2481.852557] remove /devices/pci0000:00/0000:00:1d.1/usb2/2-1/2-1.3/2-1.3.1/2-1.3.1:1.0/0003:0000:3821.0021/input/input41/mouse0 (input)
UDEV [2481.878227] remove /devices/pci0000:00/0000:00:1d.1/usb2/2-1/2-1.3/2-1.3.1/2-1.3.1:1.0/0003:0000:3821.0021/input/input41/event4 (input)
UDEV [2481.898409] remove /devices/pci0000:00/0000:00:1d.1/usb2/2-1/2-1.3/2-1.3.1/2-1.3.1:1.0/0003:0000:3821.0021/hidraw/hidraw0 (hidraw)
UDEV [2481.899562] remove /devices/pci0000:00/0000:00:1d.1/usb2/2-1/2-1.3/2-1.3.1/2-1.3.1:1.0/0003:0000:3821.0021/input/input41 (input)
UDEV [2481.900458] remove /devices/pci0000:00/0000:00:1d.1/usb2/2-1/2-1.3/2-1.3.1/2-1.3.1:1.0/0003:0000:3821.0021 (hid)
UDEV [2481.901559] remove /devices/pci0000:00/0000:00:1d.1/usb2/2-1/2-1.3/2-1.3.1/2-1.3.1:1.0 (usb)
UDEV [2481.902511] remove /devices/pci0000:00/0000:00:1d.1/usb2/2-1/2-1.3/2-1.3.1 (usb)
UDEV [2481.947137] change /devices/pci0000:00/0000:00:1d.1/usb2/2-1/2-1.3/2-1.3.3/2-1.3.3:1.0/0003:2A7A:0C18.0022/input/input42/input42::numlock (leds)
UDEV [2481.948422] change /devices/pci0000:00/0000:00:1d.1/usb2/2-1/2-1.3/2-1.3.3/2-1.3.3:1.0/0003:2A7A:0C18.0022/input/input42/input42::scrolllock (leds)
UDEV [2481.949203] change /devices/pci0000:00/0000:00:1d.1/usb2/2-1/2-1.3/2-1.3.3/2-1.3.3:1.0/0003:2A7A:0C18.0022/input/input42/input42::capslock (leds)
UDEV [2481.949904] remove /devices/pci0000:00/0000:00:1d.1/usb2/2-1/2-1.3/2-1.3.3/2-1.3.3:1.0/0003:2A7A:0C18.0022/input/input42/input42::numlock (leds)
UDEV [2481.950998] remove /devices/pci0000:00/0000:00:1d.1/usb2/2-1/2-1.3/2-1.3.3/2-1.3.3:1.0/0003:2A7A:0C18.0022/input/input42/input42::compose (leds)
UDEV [2481.951281] change /devices/pci0000:00/0000:00:1d.1/usb2/2-1/2-1.3/2-1.3.3/2-1.3.3:1.0/0003:2A7A:0C18.0022/input/input42/input42::kana (leds)
UDEV [2481.952721] remove /devices/pci0000:00/0000:00:1d.1/usb2/2-1/2-1.3/2-1.3.3/2-1.3.3:1.0/0003:2A7A:0C18.0022/input/input42/input42::capslock (leds)
UDEV [2481.953260] remove /devices/pci0000:00/0000:00:1d.1/usb2/2-1/2-1.3/2-1.3.3/2-1.3.3:1.0/0003:2A7A:0C18.0022/input/input42/input42::scrolllock (leds)
UDEV [2481.953460] remove /devices/pci0000:00/0000:00:1d.1/usb2/2-1/2-1.3/2-1.3.3/2-1.3.3:1.0/0003:2A7A:0C18.0022/input/input42/input42::kana (leds)
UDEV [2481.961925] remove /devices/pci0000:00/0000:00:1d.1/usb2/2-1/2-1.3/2-1.3.3/2-1.3.3:1.0/0003:2A7A:0C18.0022/input/input42/event5 (input)
UDEV [2481.990163] remove /devices/pci0000:00/0000:00:1d.1/usb2/2-1/2-1.3/2-1.3.3/2-1.3.3:1.0/0003:2A7A:0C18.0022/input/input42 (input)
UDEV [2481.991174] remove /devices/pci0000:00/0000:00:1d.1/usb2/2-1/2-1.3/2-1.3.3/2-1.3.3:1.0/0003:2A7A:0C18.0022/hidraw/hidraw1 (hidraw)
UDEV [2481.992121] remove /devices/pci0000:00/0000:00:1d.1/usb2/2-1/2-1.3/2-1.3.3/2-1.3.3:1.0/0003:2A7A:0C18.0022 (hid)
UDEV [2481.992979] remove /devices/pci0000:00/0000:00:1d.1/usb2/2-1/2-1.3/2-1.3.3/2-1.3.3:1.0 (usb)
UDEV [2482.026264] remove /devices/pci0000:00/0000:00:1d.1/usb2/2-1/2-1.3/2-1.3.3/2-1.3.3:1.1/0003:2A7A:0C18.0023/input/input43/event9 (input)
UDEV [2482.046072] remove /devices/pci0000:00/0000:00:1d.1/usb2/2-1/2-1.3/2-1.3.3/2-1.3.3:1.1/0003:2A7A:0C18.0023/input/input43 (input)
UDEV [2482.046600] remove /devices/pci0000:00/0000:00:1d.1/usb2/2-1/2-1.3/2-1.3.3/2-1.3.3:1.1/0003:2A7A:0C18.0023/hidraw/hidraw2 (hidraw)
UDEV [2482.047491] remove /devices/pci0000:00/0000:00:1d.1/usb2/2-1/2-1.3/2-1.3.3/2-1.3.3:1.1/0003:2A7A:0C18.0023 (hid)
UDEV [2482.048082] remove /devices/pci0000:00/0000:00:1d.1/usb2/2-1/2-1.3/2-1.3.3/2-1.3.3:1.1 (usb)
UDEV [2482.049015] remove /devices/pci0000:00/0000:00:1d.1/usb2/2-1/2-1.3/2-1.3.3 (usb)
UDEV [2482.049160] remove /devices/pci0000:00/0000:00:1d.1/usb2/2-1/2-1.3/2-1.3:1.0 (usb)
UDEV [2482.050147] remove /devices/pci0000:00/0000:00:1d.1/usb2/2-1/2-1.3 (usb)
UDEV [2482.425829] add /devices/pci0000:00/0000:00:1d.1/usb2/2-1/2-1.3 (usb)
UDEV [2482.428596] add /devices/pci0000:00/0000:00:1d.1/usb2/2-1/2-1.3/2-1.3:1.0 (usb)
UDEV [2483.891171] add /devices/pci0000:00/0000:00:1d.1/usb2/2-1/2-1.3/2-1.3.4 (usb)
UDEV [2483.892113] add /devices/pci0000:00/0000:00:1d.1/usb2/2-1/2-1.3/2-1.3.1 (usb)
UDEV [2483.894737] add /devices/pci0000:00/0000:00:1d.1/usb2/2-1/2-1.3/2-1.3.3 (usb)
UDEV [2483.894789] add /devices/pci0000:00/0000:00:1d.1/usb2/2-1/2-1.3/2-1.3.4/2-1.3.4:1.0 (usb)
UDEV [2483.896482] add /devices/pci0000:00/0000:00:1d.1/usb2/2-1/2-1.3/2-1.3.3/2-1.3.3:1.0 (usb)
UDEV [2483.897352] add /devices/pci0000:00/0000:00:1d.1/usb2/2-1/2-1.3/2-1.3.4/2-1.3.4:1.1 (usb)
UDEV [2483.899359] add /devices/pci0000:00/0000:00:1d.1/usb2/2-1/2-1.3/2-1.3.4/2-1.3.4:1.3 (usb)
UDEV [2483.899659] add /devices/pci0000:00/0000:00:1d.1/usb2/2-1/2-1.3/2-1.3.1/2-1.3.1:1.0 (usb)
UDEV [2483.901082] add /devices/pci0000:00/0000:00:1d.1/usb2/2-1/2-1.3/2-1.3.4/2-1.3.4:1.0/sound/card2 (sound)
UDEV [2483.901327] add /devices/pci0000:00/0000:00:1d.1/usb2/2-1/2-1.3/2-1.3.3/2-1.3.3:1.1 (usb)
UDEV [2483.903090] add /devices/pci0000:00/0000:00:1d.1/usb2/2-1/2-1.3/2-1.3.1/2-1.3.1:1.0/0003:0000:3821.0025 (hid)
UDEV [2483.903415] add /devices/pci0000:00/0000:00:1d.1/usb2/2-1/2-1.3/2-1.3.3/2-1.3.3:1.0/0003:2A7A:0C18.0026 (hid)
UDEV [2483.904608] add /devices/pci0000:00/0000:00:1d.1/usb2/2-1/2-1.3/2-1.3.4/2-1.3.4:1.0/sound/card2/pcmC2D0p (sound)
UDEV [2483.907424] add /devices/pci0000:00/0000:00:1d.1/usb2/2-1/2-1.3/2-1.3.1/2-1.3.1:1.0/0003:0000:3821.0025/hidraw/hidraw0 (hidraw)
UDEV [2483.908755] add /devices/pci0000:00/0000:00:1d.1/usb2/2-1/2-1.3/2-1.3.3/2-1.3.3:1.0/0003:2A7A:0C18.0026/hidraw/hidraw1 (hidraw)
UDEV [2483.908937] add /devices/pci0000:00/0000:00:1d.1/usb2/2-1/2-1.3/2-1.3.3/2-1.3.3:1.0/0003:2A7A:0C18.0026/input/input46 (input)
UDEV [2483.910801] add /devices/pci0000:00/0000:00:1d.1/usb2/2-1/2-1.3/2-1.3.1/2-1.3.1:1.0/0003:0000:3821.0025/input/input45 (input)
UDEV [2483.913480] add /devices/pci0000:00/0000:00:1d.1/usb2/2-1/2-1.3/2-1.3.4/2-1.3.4:1.2 (usb)
UDEV [2483.913591] add /devices/pci0000:00/0000:00:1d.1/usb2/2-1/2-1.3/2-1.3.3/2-1.3.3:1.0/0003:2A7A:0C18.0026/input/input46/input46::scrolllock (leds)
UDEV [2483.913757] add /devices/pci0000:00/0000:00:1d.1/usb2/2-1/2-1.3/2-1.3.3/2-1.3.3:1.0/0003:2A7A:0C18.0026/input/input46/input46::capslock (leds)
UDEV [2483.916214] change /devices/pci0000:00/0000:00:1d.1/usb2/2-1/2-1.3/2-1.3.3/2-1.3.3:1.0/0003:2A7A:0C18.0026/input/input46/input46::scrolllock (leds)
UDEV [2483.917288] add /devices/pci0000:00/0000:00:1d.1/usb2/2-1/2-1.3/2-1.3.4/2-1.3.4:1.3/0003:0B0E:2000.0028 (hid)
UDEV [2483.917803] add /devices/pci0000:00/0000:00:1d.1/usb2/2-1/2-1.3/2-1.3.3/2-1.3.3:1.1/0003:2A7A:0C18.0027 (hid)
UDEV [2483.918573] add /devices/pci0000:00/0000:00:1d.1/usb2/2-1/2-1.3/2-1.3.1/2-1.3.1:1.0/0003:0000:3821.0025/input/input45/mouse0 (input)
UDEV [2483.918611] add /devices/pci0000:00/0000:00:1d.1/usb2/2-1/2-1.3/2-1.3.3/2-1.3.3:1.0/0003:2A7A:0C18.0026/input/input46/input46::numlock (leds)
UDEV [2483.921679] add /devices/pci0000:00/0000:00:1d.1/usb2/2-1/2-1.3/2-1.3.4/2-1.3.4:1.3/0003:0B0E:2000.0028/hidraw/hidraw3 (hidraw)
UDEV [2483.922774] add /devices/pci0000:00/0000:00:1d.1/usb2/2-1/2-1.3/2-1.3.4/2-1.3.4:1.0/sound/card2/pcmC2D0c (sound)
UDEV [2483.924691] change /devices/pci0000:00/0000:00:1d.1/usb2/2-1/2-1.3/2-1.3.3/2-1.3.3:1.0/0003:2A7A:0C18.0026/input/input46/input46::numlock (leds)
UDEV [2483.924807] add /devices/pci0000:00/0000:00:1d.1/usb2/2-1/2-1.3/2-1.3.4/2-1.3.4:1.3/0003:0B0E:2000.0028/input/input48 (input)
UDEV [2483.926085] add /devices/pci0000:00/0000:00:1d.1/usb2/2-1/2-1.3/2-1.3.3/2-1.3.3:1.1/0003:2A7A:0C18.0027/input/input47 (input)
UDEV [2483.928405] add /devices/pci0000:00/0000:00:1d.1/usb2/2-1/2-1.3/2-1.3.3/2-1.3.3:1.0/0003:2A7A:0C18.0026/input/input46/input46::kana (leds)
UDEV [2483.929192] add /devices/pci0000:00/0000:00:1d.1/usb2/2-1/2-1.3/2-1.3.3/2-1.3.3:1.0/0003:2A7A:0C18.0026/input/input46/input46::compose (leds)
UDEV [2483.930449] change /devices/pci0000:00/0000:00:1d.1/usb2/2-1/2-1.3/2-1.3.3/2-1.3.3:1.0/0003:2A7A:0C18.0026/input/input46/input46::kana (leds)
UDEV [2483.931191] change /devices/pci0000:00/0000:00:1d.1/usb2/2-1/2-1.3/2-1.3.3/2-1.3.3:1.0/0003:2A7A:0C18.0026/input/input46/input46::capslock (leds)
UDEV [2483.931880] add /devices/pci0000:00/0000:00:1d.1/usb2/2-1/2-1.3/2-1.3.3/2-1.3.3:1.1/0003:2A7A:0C18.0027/hidraw/hidraw2 (hidraw)
UDEV [2483.942090] add /devices/pci0000:00/0000:00:1d.1/usb2/2-1/2-1.3/2-1.3.4/2-1.3.4:1.0/sound/card2/controlC2 (sound)
UDEV [2483.944804] change /devices/pci0000:00/0000:00:1d.1/usb2/2-1/2-1.3/2-1.3.4/2-1.3.4:1.0/sound/card2 (sound)
UDEV [2483.971457] add /devices/pci0000:00/0000:00:1d.1/usb2/2-1/2-1.3/2-1.3.3/2-1.3.3:1.1/0003:2A7A:0C18.0027/input/input47/event9 (input)
UDEV [2483.983444] add /devices/pci0000:00/0000:00:1d.1/usb2/2-1/2-1.3/2-1.3.3/2-1.3.3:1.0/0003:2A7A:0C18.0026/input/input46/event5 (input)
UDEV [2483.983861] add /devices/pci0000:00/0000:00:1d.1/usb2/2-1/2-1.3/2-1.3.4/2-1.3.4:1.3/0003:0B0E:2000.0028/input/input48/event10 (input)
UDEV [2484.025328] add /devices/pci0000:00/0000:00:1d.1/usb2/2-1/2-1.3/2-1.3.1/2-1.3.1:1.0/0003:0000:3821.0025/input/input45/event4 (input)
UDEV [2484.031531] remove /devices/pci0000:00/0000:00:1d.1/usb2/2-1/2-1.3/2-1.3.4/2-1.3.4:1.0/sound/card2/pcmC2D0c (sound)
UDEV [2484.031575] remove /devices/pci0000:00/0000:00:1d.1/usb2/2-1/2-1.3/2-1.3.4/2-1.3.4:1.0/sound/card2/pcmC2D0p (sound)
UDEV [2484.032364] remove /devices/pci0000:00/0000:00:1d.1/usb2/2-1/2-1.3/2-1.3.4/2-1.3.4:1.0/sound/card2/controlC2 (sound)
UDEV [2484.033251] remove /devices/pci0000:00/0000:00:1d.1/usb2/2-1/2-1.3/2-1.3.4/2-1.3.4:1.0/sound/card2 (sound)
UDEV [2484.037642] remove /devices/pci0000:00/0000:00:1d.1/usb2/2-1/2-1.3/2-1.3.4/2-1.3.4:1.0 (usb)
UDEV [2484.038499] remove /devices/pci0000:00/0000:00:1d.1/usb2/2-1/2-1.3/2-1.3.4/2-1.3.4:1.2 (usb)
UDEV [2484.038720] remove /devices/pci0000:00/0000:00:1d.1/usb2/2-1/2-1.3/2-1.3.4/2-1.3.4:1.1 (usb)
UDEV [2484.058286] remove /devices/pci0000:00/0000:00:1d.1/usb2/2-1/2-1.3/2-1.3.4/2-1.3.4:1.3/0003:0B0E:2000.0028/input/input48/event10 (input)
UDEV [2484.123860] remove /devices/pci0000:00/0000:00:1d.1/usb2/2-1/2-1.3/2-1.3.4/2-1.3.4:1.3/0003:0B0E:2000.0028/input/input48 (input)
UDEV [2484.124213] remove /devices/pci0000:00/0000:00:1d.1/usb2/2-1/2-1.3/2-1.3.4/2-1.3.4:1.3/0003:0B0E:2000.0028/hidraw/hidraw3 (hidraw)
UDEV [2484.125051] remove /devices/pci0000:00/0000:00:1d.1/usb2/2-1/2-1.3/2-1.3.4/2-1.3.4:1.3/0003:0B0E:2000.0028 (hid)
UDEV [2484.125842] remove /devices/pci0000:00/0000:00:1d.1/usb2/2-1/2-1.3/2-1.3.4/2-1.3.4:1.3 (usb)
UDEV [2484.126953] remove /devices/pci0000:00/0000:00:1d.1/usb2/2-1/2-1.3/2-1.3.4 (usb)
^Cjohn@StudyPC:~$
请参阅下面的今天早上尝试的系统日志条目
Mar 3 10:51:26 StudyPC kernel: [22005.315836] usb 2-1.3: USB disconnect, device number 58
Mar 3 10:51:26 StudyPC kernel: [22005.315840] usb 2-1.3.1: USB disconnect, device number 59
Mar 3 10:51:26 StudyPC /usr/lib/gdm3/gdm-x-session[710]: (II) config/udev: removing device SiliconWin mouse
Mar 3 10:51:26 StudyPC /usr/lib/gdm3/gdm-x-session[710]: (**) Option "fd" "44"
Mar 3 10:51:26 StudyPC /usr/lib/gdm3/gdm-x-session[710]: (II) UnloadModule: "libinput"
Mar 3 10:51:26 StudyPC /usr/lib/gdm3/gdm-x-session[710]: (II) systemd-logind: releasing fd for 13:68
Mar 3 10:51:26 StudyPC kernel: [22005.344338] usb 2-1.3.3: USB disconnect, device number 65
Mar 3 10:51:26 StudyPC /usr/lib/gdm3/gdm-x-session[710]: (II) config/udev: removing device U
Mar 3 10:51:26 StudyPC /usr/lib/gdm3/gdm-x-session[710]: (**) Option "fd" "40"
Mar 3 10:51:26 StudyPC /usr/lib/gdm3/gdm-x-session[710]: (II) UnloadModule: "libinput"
Mar 3 10:51:26 StudyPC /usr/lib/gdm3/gdm-x-session[710]: (II) systemd-logind: releasing fd for 13:73
Mar 3 10:51:26 StudyPC /usr/lib/gdm3/gdm-x-session[710]: (II) config/udev: removing device U
Mar 3 10:51:26 StudyPC /usr/lib/gdm3/gdm-x-session[710]: (**) Option "fd" "33"
Mar 3 10:51:26 StudyPC /usr/lib/gdm3/gdm-x-session[710]: (II) UnloadModule: "libinput"
Mar 3 10:51:26 StudyPC /usr/lib/gdm3/gdm-x-session[710]: (II) systemd-logind: releasing fd for 13:74
Mar 3 10:51:26 StudyPC kernel: [22005.724015] usb 2-1.3: new full-speed USB device number 66 using uhci_hcd
Mar 3 10:51:26 StudyPC kernel: [22005.845839] usb 2-1.3: not running at top speed; connect to a high speed hub
Mar 3 10:51:26 StudyPC kernel: [22005.867840] usb 2-1.3: New USB device found, idVendor=05e3, idProduct=0605
Mar 3 10:51:26 StudyPC kernel: [22005.867843] usb 2-1.3: New USB device strings: Mfr=0, Product=1, SerialNumber=0
Mar 3 10:51:26 StudyPC kernel: [22005.867845] usb 2-1.3: Product: USB2.0 Hub
Mar 3 10:51:26 StudyPC kernel: [22005.871923] hub 2-1.3:1.0: USB hub found
Mar 3 10:51:26 StudyPC kernel: [22005.873841] hub 2-1.3:1.0: 4 ports detected
Mar 3 10:51:27 StudyPC kernel: [22006.172019] usb 2-1.3.1: new low-speed USB device number 67 using uhci_hcd
Mar 3 10:51:27 StudyPC kernel: [22006.320846] usb 2-1.3.1: New USB device found, idVendor=0000, idProduct=3821
Mar 3 10:51:27 StudyPC kernel: [22006.320849] usb 2-1.3.1: New USB device strings: Mfr=0, Product=1, SerialNumber=0
Mar 3 10:51:27 StudyPC kernel: [22006.320851] usb 2-1.3.1: Product: SiliconWin mouse
Mar 3 10:51:27 StudyPC kernel: [22006.339419] input: SiliconWin mouse as /devices/pci0000:00/0000:00:1d.1/usb2/2-1/2-1.3/2-1.3.1/2-1.3.1:1.0/0003:0000:3821.0038/input/input70
Mar 3 10:51:27 StudyPC kernel: [22006.339582] hid-generic 0003:0000:3821.0038: input,hidraw0: USB HID v1.11 Mouse [SiliconWin mouse] on usb-0000:00:1d.1-1.3.1/input0
Mar 3 10:51:27 StudyPC kernel: [22006.424012] usb 2-1.3.3: new low-speed USB device number 68 using uhci_hcd
Mar 3 10:51:27 StudyPC kernel: [22006.571850] usb 2-1.3.3: New USB device found, idVendor=2a7a, idProduct=0c18
Mar 3 10:51:27 StudyPC kernel: [22006.571853] usb 2-1.3.3: New USB device strings: Mfr=0, Product=2, SerialNumber=0
Mar 3 10:51:27 StudyPC kernel: [22006.571855] usb 2-1.3.3: Product: U
Mar 3 10:51:27 StudyPC kernel: [22006.595397] input: U as /devices/pci0000:00/0000:00:1d.1/usb2/2-1/2-1.3/2-1.3.3/2-1.3.3:1.0/0003:2A7A:0C18.0039/input/input71
Mar 3 10:51:27 StudyPC kernel: [22006.653059] hid-generic 0003:2A7A:0C18.0039: input,hidraw1: USB HID v1.10 Keyboard [U] on usb-0000:00:1d.1-1.3.3/input0
Mar 3 10:51:27 StudyPC kernel: [22006.681928] input: U as /devices/pci0000:00/0000:00:1d.1/usb2/2-1/2-1.3/2-1.3.3/2-1.3.3:1.1/0003:2A7A:0C18.003A/input/input72
Mar 3 10:51:27 StudyPC kernel: [22006.740209] hid-generic 0003:2A7A:0C18.003A: input,hidraw2: USB HID v1.10 Device [U] on usb-0000:00:1d.1-1.3.3/input1
Mar 3 10:51:28 StudyPC kernel: [22006.968014] usb 2-1.3.4: new full-speed USB device number 69 using uhci_hcd
Mar 3 10:51:28 StudyPC kernel: [22007.166858] usb 2-1.3.4: New USB device found, idVendor=0b0e, idProduct=2000
Mar 3 10:51:28 StudyPC kernel: [22007.166862] usb 2-1.3.4: New USB device strings: Mfr=1, Product=2, SerialNumber=0
Mar 3 10:51:28 StudyPC kernel: [22007.166864] usb 2-1.3.4: Product: GN 2000 USB
Mar 3 10:51:28 StudyPC kernel: [22007.166866] usb 2-1.3.4: Manufacturer: GN Netcom
Mar 3 10:51:28 StudyPC kernel: [22007.178858] usb 2-1.3.4: 1:1: cannot set freq 48000 to ep 0x1
Mar 3 10:51:28 StudyPC kernel: [22007.180858] usb 2-1.3.4: 1:2: cannot set freq 48000 to ep 0x1
Mar 3 10:51:28 StudyPC kernel: [22007.183857] usb 2-1.3.4: 2:1: cannot set freq 48000 to ep 0x84
Mar 3 10:51:28 StudyPC kernel: [22007.185857] usb 2-1.3.4: 2:2: cannot set freq 48000 to ep 0x84
Mar 3 10:51:28 StudyPC kernel: [22007.187856] usb 2-1.3.4: 2:3: cannot set freq 48000 to ep 0x84
Mar 3 10:51:28 StudyPC kernel: [22007.198858] usb 2-1.3.4: 6:0: cannot get min/max values for control 2 (id 6)
Mar 3 10:51:28 StudyPC kernel: [22007.208858] usb 2-1.3.4: 1:0: cannot get min/max values for control 2 (id 1)
Mar 3 10:51:28 StudyPC kernel: [22007.218857] usb 2-1.3.4: 1:0: cannot get min/max values for control 3 (id 1)
Mar 3 10:51:28 StudyPC kernel: [22007.228857] usb 2-1.3.4: 1:0: cannot get min/max values for control 5 (id 1)
Mar 3 10:51:28 StudyPC kernel: [22007.238857] usb 2-1.3.4: 2:0: cannot get min/max values for control 2 (id 2)
Mar 3 10:51:28 StudyPC kernel: [22007.243859] usbhid 2-1.3.4:1.3: can't add hid device: -71
Mar 3 10:51:28 StudyPC kernel: [22007.243868] usbhid: probe of 2-1.3.4:1.3 failed with error -71
Mar 3 10:51:28 StudyPC kernel: [22007.246859] usb 2-1.3.4: USB disconnect, device number 69
Mar 3 10:51:28 StudyPC mtp-probe: checking bus 2, device 68: "/sys/devices/pci0000:00/0000:00:1d.1/usb2/2-1/2-1.3/2-1.3.3"
Mar 3 10:51:28 StudyPC mtp-probe: bus: 2, device: 68 was not an MTP device
Mar 3 10:51:28 StudyPC systemd-udevd[5343]: error opening ATTR{/sys/devices/pci0000:00/0000:00:1d.1/usb2/2-1/2-1.3/2-1.3.4/2-1.3.4:1.0/sound/card2/controlC2/../uevent} for writing: No such file or directory
Mar 3 10:51:28 StudyPC mtp-probe: checking bus 2, device 67: "/sys/devices/pci0000:00/0000:00:1d.1/usb2/2-1/2-1.3/2-1.3.1"
Mar 3 10:51:28 StudyPC mtp-probe: bus: 2, device: 67 was not an MTP device
Mar 3 10:51:28 StudyPC /usr/lib/gdm3/gdm-x-session[710]: (II) config/udev: Adding input device SiliconWin mouse (/dev/input/mouse0)
Mar 3 10:51:28 StudyPC /usr/lib/gdm3/gdm-x-session[710]: (II) No input driver specified, ignoring this device.
Mar 3 10:51:28 StudyPC /usr/lib/gdm3/gdm-x-session[710]: (II) This device may have been added with another device file.
Mar 3 10:51:28 StudyPC /usr/lib/gdm3/gdm-x-session[710]: (II) config/udev: Adding input device U (/dev/input/event5)
Mar 3 10:51:28 StudyPC /usr/lib/gdm3/gdm-x-session[710]: (**) U: Applying InputClass "libinput keyboard catchall"
Mar 3 10:51:28 StudyPC /usr/lib/gdm3/gdm-x-session[710]: (II) Using input driver 'libinput' for 'U'
Mar 3 10:51:28 StudyPC /usr/lib/gdm3/gdm-x-session[710]: (II) systemd-logind: got fd for /dev/input/event5 13:69 fd 40 paused 0
Mar 3 10:51:28 StudyPC /usr/lib/gdm3/gdm-x-session[710]: (**) U: always reports core events
Mar 3 10:51:28 StudyPC /usr/lib/gdm3/gdm-x-session[710]: (**) Option "Device" "/dev/input/event5"
Mar 3 10:51:28 StudyPC /usr/lib/gdm3/gdm-x-session[710]: (**) Option "_source" "server/udev"
Mar 3 10:51:28 StudyPC /usr/lib/gdm3/gdm-x-session[710]: (II) input device 'U', /dev/input/event5 is tagged by udev as: Keyboard
Mar 3 10:51:28 StudyPC /usr/lib/gdm3/gdm-x-session[710]: (II) input device 'U', /dev/input/event5 is a keyboard
Mar 3 10:51:28 StudyPC /usr/lib/gdm3/gdm-x-session[710]: (**) Option "config_info" "udev:/sys/devices/pci0000:00/0000:00:1d.1/usb2/2-1/2-1.3/2-1.3.3/2-1.3.3:1.0/0003:2A7A:0C18.0039/input/input71/event5"
Mar 3 10:51:28 StudyPC /usr/lib/gdm3/gdm-x-session[710]: (II) XINPUT: Adding extended input device "U" (type: KEYBOARD, id 8)
Mar 3 10:51:28 StudyPC /usr/lib/gdm3/gdm-x-session[710]: (**) Option "xkb_model" "pc105"
Mar 3 10:51:28 StudyPC /usr/lib/gdm3/gdm-x-session[710]: (**) Option "xkb_layout" "gb"
Mar 3 10:51:28 StudyPC /usr/lib/gdm3/gdm-x-session[710]: (WW) Option "xkb_variant" requires a string value
Mar 3 10:51:28 StudyPC /usr/lib/gdm3/gdm-x-session[710]: (WW) Option "xkb_options" requires a string value
Mar 3 10:51:28 StudyPC /usr/lib/gdm3/gdm-x-session[710]: (II) input device 'U', /dev/input/event5 is tagged by udev as: Keyboard
Mar 3 10:51:28 StudyPC /usr/lib/gdm3/gdm-x-session[710]: (II) input device 'U', /dev/input/event5 is a keyboard
Mar 3 10:51:28 StudyPC /usr/lib/gdm3/gdm-x-session[710]: (II) config/udev: Adding input device U (/dev/input/event9)
Mar 3 10:51:28 StudyPC /usr/lib/gdm3/gdm-x-session[710]: (**) U: Applying InputClass "libinput keyboard catchall"
Mar 3 10:51:28 StudyPC /usr/lib/gdm3/gdm-x-session[710]: (II) Using input driver 'libinput' for 'U'
Mar 3 10:51:28 StudyPC /usr/lib/gdm3/gdm-x-session[710]: (II) systemd-logind: got fd for /dev/input/event9 13:73 fd 43 paused 0
Mar 3 10:51:28 StudyPC /usr/lib/gdm3/gdm-x-session[710]: (**) U: always reports core events
Mar 3 10:51:28 StudyPC /usr/lib/gdm3/gdm-x-session[710]: (**) Option "Device" "/dev/input/event9"
Mar 3 10:51:28 StudyPC /usr/lib/gdm3/gdm-x-session[710]: (**) Option "_source" "server/udev"
Mar 3 10:51:28 StudyPC /usr/lib/gdm3/gdm-x-session[710]: (II) input device 'U', /dev/input/event9 is tagged by udev as: Keyboard
Mar 3 10:51:28 StudyPC /usr/lib/gdm3/gdm-x-session[710]: (II) input device 'U', /dev/input/event9 is a keyboard
Mar 3 10:51:28 StudyPC /usr/lib/gdm3/gdm-x-session[710]: (**) Option "config_info" "udev:/sys/devices/pci0000:00/0000:00:1d.1/usb2/2-1/2-1.3/2-1.3.3/2-1.3.3:1.1/0003:2A7A:0C18.003A/input/input72/event9"
Mar 3 10:51:28 StudyPC /usr/lib/gdm3/gdm-x-session[710]: (II) XINPUT: Adding extended input device "U" (type: KEYBOARD, id 9)
Mar 3 10:51:28 StudyPC /usr/lib/gdm3/gdm-x-session[710]: (**) Option "xkb_model" "pc105"
Mar 3 10:51:28 StudyPC /usr/lib/gdm3/gdm-x-session[710]: (**) Option "xkb_layout" "gb"
Mar 3 10:51:28 StudyPC /usr/lib/gdm3/gdm-x-session[710]: (WW) Option "xkb_variant" requires a string value
Mar 3 10:51:28 StudyPC /usr/lib/gdm3/gdm-x-session[710]: (WW) Option "xkb_options" requires a string value
Mar 3 10:51:28 StudyPC /usr/lib/gdm3/gdm-x-session[710]: (II) input device 'U', /dev/input/event9 is tagged by udev as: Keyboard
Mar 3 10:51:28 StudyPC /usr/lib/gdm3/gdm-x-session[710]: (II) input device 'U', /dev/input/event9 is a keyboard
Mar 3 10:51:28 StudyPC /usr/lib/gdm3/gdm-x-session[710]: (II) config/udev: Adding input device SiliconWin mouse (/dev/input/event4)
Mar 3 10:51:28 StudyPC /usr/lib/gdm3/gdm-x-session[710]: (**) SiliconWin mouse: Applying InputClass "libinput pointer catchall"
Mar 3 10:51:28 StudyPC /usr/lib/gdm3/gdm-x-session[710]: (II) Using input driver 'libinput' for 'SiliconWin mouse'
Mar 3 10:51:28 StudyPC /usr/lib/gdm3/gdm-x-session[710]: (II) systemd-logind: got fd for /dev/input/event4 13:68 fd 44 paused 0
Mar 3 10:51:28 StudyPC /usr/lib/gdm3/gdm-x-session[710]: (**) SiliconWin mouse: always reports core events
Mar 3 10:51:28 StudyPC /usr/lib/gdm3/gdm-x-session[710]: (**) Option "Device" "/dev/input/event4"
Mar 3 10:51:28 StudyPC /usr/lib/gdm3/gdm-x-session[710]: (**) Option "_source" "server/udev"
Mar 3 10:51:28 StudyPC /usr/lib/gdm3/gdm-x-session[710]: (II) input device 'SiliconWin mouse', /dev/input/event4 is tagged by udev as: Mouse
Mar 3 10:51:28 StudyPC /usr/lib/gdm3/gdm-x-session[710]: (II) input device 'SiliconWin mouse', /dev/input/event4 is a pointer caps
Mar 3 10:51:28 StudyPC /usr/lib/gdm3/gdm-x-session[710]: (**) Option "config_info" "udev:/sys/devices/pci0000:00/0000:00:1d.1/usb2/2-1/2-1.3/2-1.3.1/2-1.3.1:1.0/0003:0000:3821.0038/input/input70/event4"
Mar 3 10:51:28 StudyPC /usr/lib/gdm3/gdm-x-session[710]: (II) XINPUT: Adding extended input device "SiliconWin mouse" (type: MOUSE, id 10)
Mar 3 10:51:28 StudyPC /usr/lib/gdm3/gdm-x-session[710]: (**) Option "AccelerationScheme" "none"
Mar 3 10:51:28 StudyPC /usr/lib/gdm3/gdm-x-session[710]: (**) SiliconWin mouse: (accel) selected scheme none/0
Mar 3 10:51:28 StudyPC /usr/lib/gdm3/gdm-x-session[710]: (**) SiliconWin mouse: (accel) acceleration factor: 2.000
Mar 3 10:51:28 StudyPC /usr/lib/gdm3/gdm-x-session[710]: (**) SiliconWin mouse: (accel) acceleration threshold: 4
Mar 3 10:51:28 StudyPC /usr/lib/gdm3/gdm-x-session[710]: (II) input device 'SiliconWin mouse', /dev/input/event4 is tagged by udev as: Mouse
Mar 3 10:51:28 StudyPC /usr/lib/gdm3/gdm-x-session[710]: (II) input device 'SiliconWin mouse', /dev/input/event4 is a pointer caps
john@StudyPC:/var/log$