To disable the middle touchpad button paste behavior on Debian 13 GNOME, use one of these methods:

🔹 Method 1: Disable GTK Middle-Click Paste (Recommended)

This disables middle-click paste in all GTK-based applications (covers most GUI apps in GNOME):

gsettings set org.gnome.desktop.interface gtk-enable-primary-paste false

Effect: Middle-click paste stops working in GTK apps (e.g., Terminal, Files, Text Editor). Limitation: Non-GTK apps (e.g., Firefox, some Qt apps) may still paste.

🔹 Method 2: Disable Middle Button via xinput (X11 Only)

If you're using X11 (not Wayland), disable the middle button entirely:

1. Find your touchpad name:

   bash

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   xinput list

   Example output:

   text

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   ⎜   ↳ Synaptics TM3052-003 Touchpad   id=12   [slave  pointer  (14)]

2. List its properties:

   bash

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   xinput list-props "Synaptics TM3052-003 Touchpad"

   Look for:

   text

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   libinput Middle Emulation Enabled (320):    1

3. Disable middle emulation:

   bash

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   xinput set-prop "Synaptics TM3052-003 Touchpad" "libinput Middle Emulation Enabled" 0

   Note: Replace the name with your touchpad's exact name.

4. Make it permanent (create an X11 config file):

   bash

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   sudo nano /etc/X11/xorg.conf.d/40-libinput.conf

   Add:

   ini

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   Section "InputClass"
       Identifier "libinput touchpad catchall"
       MatchIsTouchpad "on"
       Option "MiddleEmulation" "disabled"
   EndSection

   Save, then restart X11 (or reboot).

🔹 Method 3: For Wayland (Default in GNOME)

Wayland doesn’t use xinput. Instead:

1. Use the GTK setting (Method 1) — this covers most apps.
2. For libinput-based touchpads, create a quirk file:
   bash

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   sudo mkdir -p /etc/libinput
   sudo nano /etc/libinput/local-overrides.quirks

   Add:
   ini

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   [Disable Middle Button]
   MatchUdevType=touchpad
   AttrEventCode=BTN_MIDDLE
   Attr=0

   Then restart your session (log out and back in).

🔍 Verify Your Session Type

To check if you're using X11 or Wayland:

echo $XDG_SESSION_TYPE

• If it returns x11, use Method 2.
• If it returns wayland, use Method 1 + 3.