Is there a method to change damage from psionic powers to nonlethal?

Is there a method to change damage from psionic powers to nonlethal?


I am looking for answers in the 3.x/d20 material from Official WotC sources (published by WotC or by authorized ‘official’ sources such as Athas.org and similar. By this metric, Pathfinder and Dreamscarred don’t count.)