INstant CAps LOck FIx for LInux (X11)

By default, Caps Lock on Linux (X11 sessions) is only activated when you release the key, not when you press it.
This small tweak changes that behavior so Caps Lock toggles immediately on key press, just like in Windows or macOS.

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What this does

• Makes Caps Lock respond instantly when you press it
• Applies automatically when you log in
• Works with GNOME, XFCE, etc.
• No sudo/root needed

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How to set it up

1. Export your current keymap:

xkbcomp -xkb $DISPLAY ~/xkbmap

2. Edit the xkbmap file:

nano ~/xkbmap

Find this line:

key <CAPS> { [ Caps_Lock ] };

Replace it with:

key <CAPS> { 
    repeat=no,
    type[group1]="ALPHABETIC", 
    symbols[group1]=[ Caps_Lock, Caps_Lock ],
    actions[group1]=[
        LockMods(modifiers=Lock), 
        Private(type=3,data[0]=1,data[1]=3,data[2]=3)
    ] 
};

Save and close.

3. Create an autoload script:

nano ~/.config/apply-caps-fix.sh

Paste:

#!/bin/bash
sleep 2
if [ -n "$DISPLAY" ]; then
    xkbcomp -w 0 /home/$USER/xkbmap $DISPLAY
    echo "CapsFix ran at $(date)" >> /tmp/capsfix.log
fi

Make it executable:

chmod +x ~/.config/apply-caps-fix.sh

Optional: test it right away (without reboot):

~/.config/apply-caps-fix.sh

4. Run the script on login using .xprofile:

nano ~/.xprofile

Paste this:

~/.config/apply-caps-fix.sh

Make sure .xprofile is executable:

chmod +x ~/.xprofile

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Reboot and test

After reboot, press Caps Lock — it should toggle instantly.
You can also check the log file:

cat /tmp/capsfix.log

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Want to remove it?

Just delete:

• ~/xkbmap
• ~/.config/apply-caps-fix.sh
• ~/.xprofile

Then reboot.