Missing "Evdev-managed keyboard" option in KDE

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https://bbs.archlinux.org – I've been trying to solve some outstanding keyboard config issues. Right now, I have some keys which don't do anything and which don't even seem to be properly recognised by the X server. (Judging by output using xev.)I'm using KDE and I found the recommendation on the KDE configuration page of Arch's wiki to set the keyboard layout to "Evdev-managed keyboard". Googling also suggestions this might be the solution.However, when I look at the list in the drop-down menu of System Settings > Input Devices > Keyboard > Hardware > Keyboard model, I can& (HowTos)