Originally posted by Polomease:

I had this problem as well. What worked for me was to go into the game's properties in Steam. Select the Controller section and in the drop down select "Disable Steam Input". This turns off Steam's meddling with controller input and lets the game handle it.
I'm using an Elite Series 2 and if I turn it on after Valheim starts it never gets detected by the game. So that solution didn't work for me.

I just picked up the game today, and upon installing it this is the first thing I experience: my elite controller's triggers are swapped.

Problem here is I don't want to disable the steam input because I like being able to re-map my paddles in the steam config. So this is kind of a bummer.

EDIT: Okay turning the controller off and on after starting the game makes everything work as expected. Still, odd solution.