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A problem i've solved for myself but not sure for how long.
On my current keyboard the key illumination is toggled using Scroll Lock and apparently it's not a very special rare case either. From what i've dug up the Xorg/X/X11 display server by default ignores(?) does not register(?) the Scroll Lock key - it's off by default and pressing it has no effect.
I didn't manage to find anything about the specific problem on arch wiki/forums so i just followed these instructions i found by googling.
I used Kate text editor
sudo kate /usr/share/X11/xkb/symbols/us
Ctrl+F to find
xkb_symbols "basic"
and at the end of its sub entries added
modifier_map Mod3 { Scroll_Lock };
And "Reset the XKB layout cache" with
sudo rm -f /var/lib/xkb/*
sudo rm -f /var/lib/lib/xkb/*
I guess a regular pacman -Syu is unlikely to overwrite this and break it but every fresh install still needs a manual Scroll Lock fix.
If anyone has a better solution to this, please do share.
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I'm sure you might have thought about this "half-solution before", but just make be sure it's cited, here it is:
Appending to the file .xbindkeysrc
The following code:
# Turn on keyboard backlight
"xset led"
m:0x0 + c:78
Scroll_Lock
# Turn off keyboard backlight
"xset -led"
m:0x1 + c:78
Shift + Scroll_Lock
This makes "Scroll Lock" turn the lights on and "Shift + Scroll Lock" turn the lights off.
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