/usr/share/mate/autostart/mate-optimus.desktop is in mate-optimus 16.10.1-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 | [Desktop Entry]
Name=MATE NVIDIA Optimus
Comment=Shows a tray icon when a compatible NVIDIA Optimus graphics card is detected
Exec=/usr/lib/mate-optimus/mate-optimus-applet
Icon=optimus-tray-nvidia
Terminal=false
Type=Application
Categories=GTK;GNOME;Settings;
StartupNotify=false
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