It is an alternative notification service that works over full screen applications and can be customized through the xfce4-notifyd-config (you may have to install it first if you haven't done it yet and want to tweak the xfce notification service).
If, after you have installed xfce-notifyd, your linux os is still starting notify-osd by default (you may have to restart the system after the installation) you can rename the notify-osd's service file so to prevent its execution
Code: Select all
cd /usr/share/dbus-1/services
sudo mv org.freedesktop.Notifications.service org.freedesktop.Notifications.service.disabled
Code: Select all
[D-BUS Service]
Name=org.freedesktop.Notifications
Exec=/usr/lib/x86_64-linux-gnu/xfce4/notifyd/xfce4-notifyd