The TV display shows no video when the Steam dock connects via HDMI cable.
The TV display shows no video when the Steam dock connects via HDMI cable.
The TV model is LG C1, the dock connects to the AVR via a high-speed HDMI cable, and the AVR links to the TV using an HDMI 2.0 cable. I adjusted the TV's resolution to 2540x1440 at 120Hz in game mode. When the game starts, I changed the resolution to 720p, turned on VRRR&G sync and Premium Freesync on the C1 TV. As a result, the video feed from the Steam Deck disappeared immediately. Another problem is that the AVR speaker remained silent during gameplay. Could this be related to the displayport dual mode issue?
Link the dock directly to the TV and attempt once more. Disconnect the AVR from the chain.
Have you experimented with adjusting this stage? I concur with Sparky: eliminate the AVR from the link during diagnostics, then reintegrate it.