I am amazed that someone would not expect compensation. It is the seat (all its functions included) that you are purchasing when you buy your ticket in a premium cabin. Had the client just wanted to get from A-B then they would have purchased a coach ticket. By purchasing a premium ticket, one should expect more than just a standard seat. I would be upset if the product I purchased was not able to perform all the functions advertised.

As far as compensation goes, perhaps some miles (enough for a one-way upgrade perhaps), or an upgraded segment for future travel. It may be hard to get compensation if this was not documented while on-board though. Did the guest have the FA write it up?