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X.org version: 1.21.1.7
Distribution: Kubuntu 23.04

I duplicated the included EIGHT_LEVEL_ALPHABETIC_LEVEL_FIVE_LOCK type, inserted an additional level as Level1, and shifted all existing levels by +1. The highest level was then Level9. Running setxkbmap (regardless of specified layout, since no xkb_symbols uses this type) yields

Error loading new keyboard description

Then, if I comment out all references to Level9 in that type, it works.

Diff here: https://github.com/yue-dongchen/Neo2-QWERTY/commit/66097e14be4aa4012c8f54aaa4ff5739bd559327

Answer to my previous question — How many levels can XKB accomodate? — which quotes 63 levels from the XKB specification.

Edit: Though I suppose it doesn't really matter, since the layout I'm seeking to modify really only uses the former 7 levels. But it would still be nice to know if I encounter the need in future.

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Thanks to wismill from xkeyboard-config, I discovered that using the numerical identifier 9 as opposed to Level9. I don't know why having more than 8 consecutive levels with the identification scheme Level + number is inadmissible; but at least that resolves the error.

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  • As a Hunch, the values 0-9 are being treated as ints with a length of 1 character. Counting 0 as a value makes 9. Anything over 8 creates an overflow error. What happens if you label the levels Level1 through Level8 so everything looks the same?
    – eyoung100
    Commented Dec 14, 2023 at 22:52
  • @eyoung100 I was thinking perhaps. Though Level0 - Level8 also doesn't work; so long as levels in that format exceeds 8 it seems.
    – Dongchen
    Commented Dec 15, 2023 at 21:35

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