Bug#1034766: systemd-udevd[…]: Failed to call EVIOCSKEYCODE with scan code 0xc022d/0xc022e, and key code 103/108: Invalid argument

[Al Ma]

Package: systemd
Version: 247.3-7+deb11u2
Control: affects -1 + udev
In the output of journalctl -b we see
…
Apr 23 22:30:59 AnonymizedMachineName kernel: usb 1-10: new low-speed USB device number 4 using xhci_hcd
Apr 23 22:30:59 AnonymizedMachineName kernel: sr 5:0:0:0: Attached scsi CD-ROM sr1
Apr 23 22:30:59 AnonymizedMachineName kernel: usb 1-10: New USB device found, idVendor=045e, idProduct=00db, bcdDevice= 1.73
Apr 23 22:30:59 AnonymizedMachineName kernel: usb 1-10: New USB device strings: Mfr=1, Product=2, SerialNumber=0
Apr 23 22:30:59 AnonymizedMachineName kernel: usb 1-10: Product: Natural® Ergonomic Keyboard 4000
Apr 23 22:30:59 AnonymizedMachineName kernel: usb 1-10: Manufacturer: Microsoft
Apr 23 22:30:59 AnonymizedMachineName kernel: input: Microsoft Natural® Ergonomic Keyboard 4000 as /devices/pci0000:00/0000:00:14.0/usb1/1-10/1-10:1.0/0003:045E:00DB.0003/input/input1
Apr 23 22:30:59 AnonymizedMachineName kernel: microsoft 0003:045E:00DB.0003: input,hidraw2: USB HID v1.11 Keyboard [Microsoft Natural® Ergonomic Keyboard 4000] on usb-0000:00:14.0-10/input0
Apr 23 22:30:59 AnonymizedMachineName kernel: input: Microsoft Natural® Ergonomic Keyboard 4000 as /devices/pci0000:00/0000:00:14.0/usb1/1-10/1-10:1.1/0003:045E:00DB.0004/input/input2
Apr 23 22:30:59 AnonymizedMachineName kernel: usb 1-11: new high-speed USB device number 5 using xhci_hcd
Apr 23 22:30:59 AnonymizedMachineName kernel: microsoft 0003:045E:00DB.0004: input,hidraw3: USB HID v1.11 Device [Microsoft Natural® Ergonomic Keyboard 4000] on usb-0000:00:14.0-10/input1
…
Apr 23 22:30:59 AnonymizedMachineName systemd[1]: Finished Flush Journal to Persistent Storage.
Apr 23 22:30:59 AnonymizedMachineName kernel: input: USB2.0 FHD UVC WebCam: USB2.0 F as /devices/pci0000:00/0000:00:14.0/usb1/1-11/1-11.4/1-11.4.2/1-11.4.2:1.0/input/input8
Apr 23 22:30:59 AnonymizedMachineName kernel: uvcvideo: Found UVC 1.50 device USB2.0 FHD UVC WebCam (04f2:b612)
Apr 23 22:30:59 AnonymizedMachineName systemd-udevd[408]: ethtool: autonegotiation is unset or enabled, the speed and duplex are not writable.
Apr 23 22:30:59 AnonymizedMachineName kernel: input: USB2.0 FHD UVC WebCam: IR Camer as /devices/pci0000:00/0000:00:14.0/usb1/1-11/1-11.4/1-11.4.2/1-11.4.2:1.2/input/input9
Apr 23 22:30:59 AnonymizedMachineName kernel: usbcore: registered new interface driver uvcvideo
Apr 23 22:30:59 AnonymizedMachineName kernel: USB Video Class driver (1.1.1)
Apr 23 22:30:59 AnonymizedMachineName systemd-udevd[397]: event1: Failed to call EVIOCSKEYCODE with scan code 0xc022d, and key code 103: Invalid argument
Apr 23 22:30:59 AnonymizedMachineName systemd-udevd[397]: event1: Failed to call EVIOCSKEYCODE with scan code 0xc022e, and key code 108: Invalid argument
The keyboard “Microsoft® Natural® Ergonomic Keyboard 4000 v1.0” is attached to the machine in question. As for the scan codes, we indeed see
###########################################################
# Microsoft
###########################################################
# Microsoft Natural Ergonomic Keyboard 4000
evdev:input:b0003v045Ep00DB*
KEYBOARD_KEY_c022d=up # zoomin
KEYBOARD_KEY_c022e=down # zoomout
in /lib/udev/hwdb.d/60-keyboard.hwdb .
In plain English, what do the two messages „systemd-udevd[…]: Failed to call EVIOCSKEYCODE with scan code …, and key code …: Invalid argument“ tell us, and how should this worry us? (By the way, the way I zoom in or out using keyboard, say, in Mozilla Firefox, is via Ctrl++ and Ctrl+-. The middle slide key of the keyboard moves the contents of the window or the cursor up and down.)
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