in game mode the resolution is fixed on 800p by default. you have to switch to native resolution in the steam settings of a game

the left side of my steam deck was very unresponsive. i returned it to valve. the new device i received works like every other touch device i have.

with the latest proton experimental it works

my workaround is to put it in the official dock, but let the tv turned off or change the channel. this results in the deck internal screen turned off