We've bought a commercial application who just work only if their dongle usb is connected to the server. However sometimes the application can not recognize the dongle, so it doesn't work, but if someone eject the dongle physically from USB port and attach it again it will recognize and work fine.
There are 43 modules loaded on the server and attach/eject the dongle does not increase/decrease number of modules.
Also I have usbmon0, usbmon1 and usbmon2 files in /dev before/after eject/attach the dongle and number of files in /dev will not change before/after eject/attach the dongle.
journalctl -f command after ejecting the dongle:
Jan 19 18:10:28 iwr kernel: usb 2-2.1: USB disconnect, device number 5
journalctl -f command after attaching the dongle:
Jan 19 18:11:11 iwr kernel: usb 2-2.1: new full-speed USB device number 6 using uhci_hcd Jan 19 18:11:11 iwr kernel: usb 2-2.1: New USB device found, idVendor=0403, idProduct=c580 Jan 19 18:11:11 iwr kernel: usb 2-2.1: New USB device strings: Mfr=1, Product=2, SerialNumber=0 Jan 19 18:11:11 iwr kernel: usb 2-2.1: Product: HID UNIKEY Jan 19 18:11:11 iwr kernel: usb 2-2.1: Manufacturer: OEM Jan 19 18:11:11 iwr kernel: usbhid 2-2.1:1.0: couldn't find an input interrupt endpoint
Can I eject and then attach it logically? (issue a command, remove a module, etc.)