TFTEC USB-PS2/J connecting log.
dmesg
[ 6280.439031] usb 4-3: new low speed USB device using ohci_hcd and address 4
[ 6280.588751] usb 4-3: New USB device found, idVendor=04d9, idProduct=1400
[ 6280.588757] usb 4-3: New USB device strings: Mfr=0, Product=0, SerialNumber=0
[ 6280.605190] input: HID 04d9:1400 as /devices/pci0000:00/0000:00:12.1/usb4/4-3/4-3:1.0/input/input7
[ 6280.605472] generic-usb 0003:04D9:1400.0004: input,hidraw1: USB HID v1.10 Keyboard [HID 04d9:1400] on usb-0000:00:12.1-3/input0
[ 6280.620214] input: HID 04d9:1400 as /devices/pci0000:00/0000:00:12.1/usb4/4-3/4-3:1.1/input/input8
[ 6280.620405] generic-usb 0003:04D9:1400.0005: input,hidraw2: USB HID v1.10 Mouse [HID 04d9:1400] on usb-0000:00:12.1-3/input1
[ 6291.289655] usb 4-3: USB disconnect, address 4

/proc/bus/usb/devices
T:  Bus=04 Lev=01 Prnt=01 Port=02 Cnt=02 Dev#=  6 Spd=1.5 MxCh= 0
D:  Ver= 1.10 Cls=00(>ifc ) Sub=00 Prot=00 MxPS= 8 #Cfgs=  1
P:  Vendor=04d9 ProdID=1400 Rev= 1.43
C:* #Ifs= 2 Cfg#= 1 Atr=a0 MxPwr=100mA
I:* If#= 0 Alt= 0 #EPs= 1 Cls=03(HID  ) Sub=01 Prot=01 Driver=usbhid
E:  Ad=81(I) Atr=03(Int.) MxPS=   8 Ivl=10ms
I:* If#= 1 Alt= 0 #EPs= 1 Cls=03(HID  ) Sub=01 Prot=02 Driver=usbhid
E:  Ad=82(I) Atr=03(Int.) MxPS=   8 Ivl=10ms