If it's selected for 11 then you can manually select channel 1 if you like. This would be preferred. Yes Auto has the router try to avoid other channels that are in use.
When two routers use the same channel, both router signal strength will cut down half. With auto channel, the router trys to avoid using the same channel with the other router. Switching channel will cause signal lost or disconnect. Since the linksys uses channel 11, the dir 655 should use channel 1. Just remember the 3 main channels are channel 1, channel 6, and channel 11. The other channels are side band channels based on these 3 main channels.