Originally Posted by
agentmelon
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I had the same problem and managed to fix it. Turning off Mouse acceleration in the game does not work. You have to do it in the game files.
Go to "My Documents > My games > Far Cry 4 > and find gameprofile.xml" Open the file in notepad
Do a search for these two values
MouseAcceleration
MouseAccelerationOn
BOTH of these values should be "0", it seems turning off Mouse Acceleration in the game only affects the value "MouseAccelerationOn" and not "MouseAcceleration"
Once you set these values to 0 load up the game and it should be fine, I've noticed the acceleration has completely gone from my game when I did this.