You can use your bane ability to inflict nonlethal damage.
Prerequisite: Bane class feature.
Benefit: While a weapon you wield is under the effect of your bane class feature, you can spend a swift action to switch between dealing lethal or nonlethal damage with bane. While your bane effect allows you to deal nonlethal damage in this way, you take no penalty on your attack roll for using a lethal weapon to deal nonlethal damage.
Pathfinder Roleplaying Game Ultimate Combat. © 2011, Paizo Publishing, LLC; Authors: Jason Bulmahn, Tim Hitchcock, Colin McComb, Rob McCreary, Jason Nelson, Stephen Radney-MacFarland, Sean K Reynolds, Owen K.C. Stephens, and Russ Taylor.