I just use one navi. The range of the trigger is -1.0 – 1.0. It shows up as event 5 in the first picture.
I just restarted about ten times and looked at what happened.
I often get something like the first picture if the navi isn’t working. A weird ID. Driver4VR says the buttons are mapped to the right controller, but they don’t do anything in SteamVR.
Then I restart and hopefully get picture 2, and get a device with no ID at all. But it works fine in SteamVR. All buttons and joystick are mapped and working fine except the trigger.
Then sometimes I get the third picture, registering as Device 1, and nothing works.
This makes it sound worse than it is really. It usually takes less than 2 restarts to get it working as it is in the 2nd picture.