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There's a widely used XKB option grp_led:scroll to light ScrollLock LED for cycling between layouts. Unfortunately, it doesn't work with ibus ATM because the implementation makes XKB consider every layout as a primary. There's a bug indicating it worked at some point, but not now.

As a workaround, I want the LED to rather light on for specific layout.

So far I found the implementation of LED light for cycle of layouts (/usr/share/X11/xkb/compat/ledscroll):

partial xkb_compatibility "group_lock" {
    indicator "Scroll Lock" {
        modifiers= None;
        groups=All-group1;
    };
};

I'd probably need to swap groups=All-group1; with something like layout=ru; to enable LED for ru layout, but I couldn't figure out the actual variable (i.e. layout is probably not what it's called). Nor I can find the layout name implementation, because /usr/share/X11/xkb/symbols/ru (and whole /usr/share/X11/xkb except for a few irrelevant files, for that matter) surprisingly doesn't have "ru" anywhere.

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