我在 Ubuntu 17.10 上使用自製的 hid 設備時遇到問題。它在 Windows 上運作良好，在另一台裝有 Kubuntu 18.04 的機器上運作良好。
我已經刪除了所有 udev 規則，重新啟動了 udev，重新啟動了 PC，但沒有任何變更。
每次我連接設備時，它都會被添加並立即刪除。
這是udevadm monitor輸出：
KERNEL[6204.330291] add /devices/pci0000:00/0000:00:1c.5/0000:06:00.0/usb5/5-1/5-1.4 (usb)
KERNEL[6204.332824] add /devices/pci0000:00/0000:00:1c.5/0000:06:00.0/usb5/5-1/5-1.4/5-1.4:1.0 (usb)
KERNEL[6204.337649] add /devices/pci0000:00/0000:00:1c.5/0000:06:00.0/usb5/5-1/5-1.4/5-1.4:1.0/0003:0483:5750.0006 (hid)
KERNEL[6204.337676] add /class/usbmisc (class)
KERNEL[6204.337781] add /devices/pci0000:00/0000:00:1c.5/0000:06:00.0/usb5/5-1/5-1.4/5-1.4:1.0/usbmisc/hiddev0 (usbmisc)
KERNEL[6204.337902] add /devices/pci0000:00/0000:00:1c.5/0000:06:00.0/usb5/5-1/5-1.4/5-1.4:1.0/0003:0483:5750.0006/hidraw/hidraw3 (hidraw)
UDEV [6204.339176] add /class/usbmisc (class)
UDEV [6204.342657] add /devices/pci0000:00/0000:00:1c.5/0000:06:00.0/usb5/5-1/5-1.4 (usb)
KERNEL[6204.343301] remove /devices/pci0000:00/0000:00:1c.5/0000:06:00.0/usb5/5-1/5-1.4/5-1.4:1.0/usbmisc/hiddev0 (usbmisc)
KERNEL[6204.343321] remove /usbmisc (class)
KERNEL[6204.343441] remove /devices/pci0000:00/0000:00:1c.5/0000:06:00.0/usb5/5-1/5-1.4/5-1.4:1.0/0003:0483:5750.0006/hidraw/hidraw3 (hidraw)
KERNEL[6204.343467] remove /devices/pci0000:00/0000:00:1c.5/0000:06:00.0/usb5/5-1/5-1.4/5-1.4:1.0/0003:0483:5750.0006 (hid)
UDEV [6204.344076] remove /usbmisc (class)
UDEV [6204.349535] add /devices/pci0000:00/0000:00:1c.5/0000:06:00.0/usb5/5-1/5-1.4/5-1.4:1.0 (usb)
UDEV [6204.353769] add /devices/pci0000:00/0000:00:1c.5/0000:06:00.0/usb5/5-1/5-1.4/5-1.4:1.0/0003:0483:5750.0006 (hid)
UDEV [6204.353793] add /devices/pci0000:00/0000:00:1c.5/0000:06:00.0/usb5/5-1/5-1.4/5-1.4:1.0/usbmisc/hiddev0 (usbmisc)
UDEV [6204.353805] remove /devices/pci0000:00/0000:00:1c.5/0000:06:00.0/usb5/5-1/5-1.4/5-1.4:1.0/usbmisc/hiddev0 (usbmisc)
UDEV [6204.353819] add /devices/pci0000:00/0000:00:1c.5/0000:06:00.0/usb5/5-1/5-1.4/5-1.4:1.0/0003:0483:5750.0006/hidraw/hidraw3 (hidraw)
UDEV [6204.354254] remove /devices/pci0000:00/0000:00:1c.5/0000:06:00.0/usb5/5-1/5-1.4/5-1.4:1.0/0003:0483:5750.0006/hidraw/hidraw3 (hidraw)
UDEV [6204.355106] remove /devices/pci0000:00/0000:00:1c.5/0000:06:00.0/usb5/5-1/5-1.4/5-1.4:1.0/0003:0483:5750.0006 (hid)
KERNEL[6204.921022] add /devices/parport0/ppdev0.0 (parport)
KERNEL[6204.921041] remove /devices/parport0/ppdev0.0 (parport)
UDEV [6204.922874] add /devices/parport0/ppdev0.0 (parport)
UDEV [6204.923290] remove /devices/parport0/ppdev0.0 (parport)
KERNEL[6209.296515] add /devices/parport0/ppdev0.0 (parport)
UDEV [6209.298376] add /devices/parport0/ppdev0.0 (parport)
KERNEL[6209.348220] remove /devices/parport0/ppdev0.0 (parport)
UDEV [6209.349800] remove /devices/parport0/ppdev0.0 (parport)
對我來說最奇怪的是這兩行：
UDEV [6204.353819] add /devices/pci0000:00/0000:00:1c.5/0000:06:00.0/usb5/5-1/5-1.4/5-1.4:1.0/0003:0483:5750.0006/hidraw/hidraw3 (hidraw)
UDEV [6204.354254] remove /devices/pci0000:00/0000:00:1c.5/0000:06:00.0/usb5/5-1/5-1.4/5-1.4:1.0/0003:0483:5750.0006/hidraw/hidraw3 (hidraw)
結果/dev下既hidraw3沒有文件hiddev0
請提出一些建議，我可以試著找出這種行為的原因。
謝謝。
更新這是 dmesg 輸出：
[ 1897.305402] usb 3-6: new full-speed USB device number 13 using xhci_hcd
[ 1897.446811] usb 3-6: New USB device found, idVendor=0483, idProduct=5750
[ 1897.446820] usb 3-6: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[ 1897.446825] usb 3-6: Product: Smart Display
[ 1897.446829] usb 3-6: Manufacturer: QS
[ 1897.446832] usb 3-6: SerialNumber: 00000000001A
[ 1897.448254] hid-generic 0003:0483:5750.0008: hiddev0,hidraw3: USB HID v1.01 Device [QS Smart Display] on usb-0000:00:14.0-6/input0
答案1
當我插入條碼掃描器時，我在 Ubuntu Xenial 上遇到了相同的問題。
我檢查了 /var/log/syslog 以及 lsof 的輸出，發現我遇到了來自 fwupd 的錯誤： https://bugs.launchpad.net/ubuntu/+source/fwupd/+bug/1717009
我停止了 fwupd，並且能夠掃描條碼。
我希望這有幫助。