The ASUS ROG Xbox Ally X/X20 will support AMD's FSR 4.1 upscaling starting October 23rd:
Steam Deck HQASUS ROG Xbox Ally X/X20 Gets FSR 4.1 Support - SDHQThe ASUS ROG Xbox Ally X/X20 will support AMD's FSR 4.1 upscaling from October 23rd thanks to a driver update.