Time: January 30th, 2016 11:30 p.m. EST
Frequency: All the time
World name: Lamia
Character name: Kaytlyn Aihya
Class/Level: Fisherman 18
Party or solo: Solo
Area and coordinates: Limsa Lominsa
Steps:
1. Switch the game to DirectX 11 from the config in the launcher
2. Attempt to fish
3. When a fish bites, the controller will not vibrate
4. Exit the game and switch to DirectX 9.0c (turn off DirectX 11)
5. Attempt to fish
6. When a fish bites, the controller will vibrate as intended

Toggling the vibration option in the System Configuration while in game will do a small vibration on the controller regardless of which DirectX mode is active. Only fishing seems to be impacted.

Controller: Logitech Wireless Gamepad F710