I have the same error and output of xev.
In a contour solution I put the follow file .desktop entry in "/etc/xdg/autostart":
$ cat dot.desktop
[Desktop Entry]
Encoding=UTF-8
Name=Keymap modifier
Comment=Keymap modifier to dot in numeric keypad
Icon=
Exec=xmodmap -e "keycode 129 = period"
Terminal=false
Type=Application
Categories=
OnlyShowIn=GNOME;XFCE;
I have the same error and output of xev. autostart" : GNOME;XFCE;
In a contour solution I put the follow file .desktop entry in "/etc/xdg/
$ cat dot.desktop
[Desktop Entry]
Encoding=UTF-8
Name=Keymap modifier
Comment=Keymap modifier to dot in numeric keypad
Icon=
Exec=xmodmap -e "keycode 129 = period"
Terminal=false
Type=Application
Categories=
OnlyShowIn=