I’m connecting the steam deck via the official steam dock to my 4k tv (Sony A80L). I’m able to display at 4k 60hz but the next option down is 1080p at 120hz. I’d like to find a nice middle ground for desktop mode but the option for 1440p is not available. Is this a limitation of the TV or the deck?
Well, the specs say your tv should support 1440p @ 144Hz, but the dock or cable (or both) may be your issue. The Deck itself should allow any resolution that is stated as supported by your display.