Support "travel-mode" for Steam Deck uses

[wheaney]

This driver could theoretically use the gyro/accel sensors from another device (Steam Deck, in this case) to cancel out movements from car/bus/airplane. As it is right now, if you're on a vehicle that's accelerating or turning, your glasses will turn your frame of reference in the game.

Without a second device for reference, it could still try to detect a constant velocity and remove that from its readings, but this wouldn't work quite as well (e.g. how do you detect a bump in the road vs a small head movement? you probably don't).