usb-SIGMACHIP_USB_Keyboard-event-if01
usb-SIGMACHIP_USB_Keyboard-event-kbd

pi@rpi-hilden:~ $ thd --dump /dev/input/by-id/usb-SIGMACHIP_USB_Keyboard-event-kbd  | grep -v '^#'

Bus 001 Device 006: ID 1c4f:0026 SiGma Micro Keyboard


/usr/share/X11/xorg.conf.d/11-disable-sigmachip.conf

cat /usr/share/X11/xorg.conf.d/11-disable-sigmachip.conf
Section "InputClass"
        Identifier "Ignore SIGMACHIP Keyboard"
        MatchProduct "SIGMACHIP USB Keyboard"
        #MatchUSBID  "1c4f:0026"
        Option "Ignore" "on"
EndSection

pi@rpi-hilden:~ $ lsusb
Bus 001 Device 005: ID 1c4f:0026 SiGma Micro Keyboard
Bus 001 Device 004: ID 17ef:6047 Lenovo
Bus 001 Device 003: ID 0424:ec00 Standard Microsystems Corp. SMSC9512/9514 Fast Ethernet Adapter
Bus 001 Device 002: ID 0424:9514 Standard Microsystems Corp.
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

pi@rpi-hilden:~ $ xinput
⎡ Virtual core pointer                    	id=2	[master pointer  (3)]
⎜   ↳ Virtual core XTEST pointer              	id=4	[slave  pointer  (2)]
⎜   ↳ Lenovo ThinkPad Compact USB Keyboard with TrackPoint	id=7	[slave  pointer  (2)]
⎜   ↳ SIGMACHIP USB Keyboard                  	id=9	[slave  pointer  (2)]
⎣ Virtual core keyboard                   	id=3	[master keyboard (2)]
    ↳ Virtual core XTEST keyboard             	id=5	[slave  keyboard (3)]
    ↳ Lenovo ThinkPad Compact USB Keyboard with TrackPoint	id=6	[slave  keyboard (3)]
    ↳ SIGMACHIP USB Keyboard                  	id=8	[slave  keyboard (3)]
    ↳ Lenovo ThinkPad Compact USB Keyboard with TrackPoint	id=10	[slave  keyboard (3)]
    ↳ SIGMACHIP USB Keyboard                  	id=11	[slave  keyboard (3)]
pi@rpi-hilden:~ $