An information handling system keyboard has plural key caps coupled to a frame with a vertical travel having a raised position defined by engagement between a stop of the frame and a key cap extension from the key cap. A fluid reservoir coupled to the key cap at the key cap extension dampens contact between the extension and stop to reduce sound generated from the keyboard at release of the keyboard key. The fluid reservoir is, for instance, an acoustic grease enclosed in membrane and integrated in the keyboard key at the extension where it aligns with the stop.