@ddstreet Thanks for the feedback.  The keyboard has “Microsoft®
Natural® Ergonomic Keyboard 4000 v1.0”, “Model 1048” printed on its
bottom.   The keyboard looks pretty standard to me from outside.  Do you
really mean it's broken?  Is any combination of the sliding key with any
modifier key(s) (such as Ctrl, Alt, or Shift) supposed to zoom in/out
say, in the Firefox Web browser?

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https://bugs.launchpad.net/bugs/1890186

Title:
  Failed to call EVIOCSKEYCODE with scan code 0xc022d, and key code 103:
  Invalid argument

Status in linux package in Ubuntu:
  Invalid
Status in systemd package in Ubuntu:
  Won't Fix

Bug description:
  I run an up-to-date Ubuntu 20.04.1 LTS "focal" with kernel
  5.4.0-42-generic on Dell Latitude E6440.  Upon examining the output of
  journalctl -b, I see this:

  Aug 03 19:22:15 pseudonymizedHostname systemd[1]: Condition check resulted in 
Show Plymouth Boot Screen being skipped.
  Aug 03 19:22:15 pseudonymizedHostname systemd[1]: Condition check resulted in 
Forward Password Requests to Plymouth Directory Watch being skipped.
  Aug 03 19:22:15 pseudonymizedHostname systemd[1]: Condition check resulted in 
Set Up Additional Binary Formats being skipped.
  Aug 03 19:22:15 pseudonymizedHostname systemd[1]: Condition check resulted in 
File System Check on Root Device being skipped.
  Aug 03 19:22:15 pseudonymizedHostname systemd[1]: Condition check resulted in 
Rebuild Hardware Database being skipped.
  Aug 03 19:22:15 pseudonymizedHostname systemd[1]: Condition check resulted in 
Platform Persistent Storage Archival being skipped.
  Aug 03 19:22:15 pseudonymizedHostname kernel: [drm] radeon: dpm initialized
  Aug 03 19:22:15 pseudonymizedHostname kernel: [drm] GART: num cpu pages 
524288, num gpu pages 524288
  Aug 03 19:22:15 pseudonymizedHostname kernel: dell_laptop: Using dell-rbtn 
acpi driver for receiving events
  Aug 03 19:22:15 pseudonymizedHostname systemd-udevd[385]: event8: Failed to 
call EVIOCSKEYCODE with scan code 0xc022d, and key code 103: Invalid argument
  Aug 03 19:22:15 pseudonymizedHostname systemd-udevd[385]: event8: Failed to 
call EVIOCSKEYCODE with scan code 0xc022e, and key code 108: Invalid argument

  "Invalid argument" means that something goes wrong there, and I don't know 
what it is.
  On my laptop, event8 seems to be keyboard-related:

  $ sudo cat /proc/bus/input/devices | grep -C 5 event8
  I: Bus=0003 Vendor=045e Product=00db Version=0111
  N: Name="Microsoft Natural® Ergonomic Keyboard 4000"
  P: Phys=usb-0000:00:14.0-13.1/input0
  S: 
Sysfs=/devices/pci0000:00/0000:00:14.0/usb3/3-13/3-13.1/3-13.1:1.0/0003:045E:00DB.0002/input/input9
  U: Uniq=
  H: Handlers=sysrq kbd event8 leds 
  B: PROP=0
  B: EV=120013
  B: KEY=1000000000007 ff800000000007ff febeffdff3cfffff fffffffffffffffe
  B: MSC=10
  B: LED=107

  The issue report
  https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1754921 is
  probably related but marked as a duplicate of a no longer existing
  issue report (#1750855).

  The report
  https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1597415
  describes a similar issue for older kernels; the differences pertain
  to error message, error code, input..., and, opposed to #19 there, I
  have no Windows partitions (except /boot/efi vfat) in /etc/fstab; mine
  is not a dual-boot machine.

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