A DisplayPort-to-HDMI converter shows nothing although direct HDMI works
Use a direct HDMI connection as the control, then try the converted route at the same resolution. Valve specifies an active DisplayPort-to-HDMI adapter for this setup. If the direct connection shows Steam but the passive converter does not, leave your game settings unchanged and correct the connection before reopening the shift.
The Deck screen goes black as soon as the TV takes over
In Gaming Mode the Deck panel normally turns off when a TV takes over. Press the Steam button: if the menu appears on the TV, your shift has not crashed. Continue on the TV. If you specifically need both screens, test the display arrangement in Desktop Mode; an unlit handheld panel by itself is not a reason to restart a save.
Valve: docking, display and input troubleshooting ↗
Potato Please: a player reports finishing a shift on Deck, with handheld frame-rate caveat ↗
The monitor detects a cable but never shows Steam
Save in handheld mode and disconnect the screen. Enable External Display Safe Mode under the Deck’s display settings, confirm the input on the TV, then reconnect. Test for a visible Steam menu before starting a shift. If the lower-bandwidth mode works, test another cable or compatible display setting before trying the original mode again.
Check a cropped HUD against the TV’s own picture settings
Display the Steam menu as well as the game. If both lose their edges, change the TV’s overscan or picture-size setting to show the full signal. Return to the same bench and check that the complete corner counters are visible. If only the game loses text, inspect its resolution instead of shrinking the entire television picture.
Valve: docking, display and input troubleshooting ↗
Potato Please: a player reports finishing a shift on Deck, with handheld frame-rate caveat ↗
Separate delayed knife movement from a slow-running shift
Try the same short cut in the same shift on the built-in display and the TV. If the scene moves smoothly but the television shows your input late, enable the TV’s low-latency Game Mode and turn off motion interpolation. Retest the same cut before changing knife sensitivity. If the whole depot still stutters on either display, pursue game performance separately.
Valve: docking, display and input troubleshooting ↗
Potato Please: a player reports finishing a shift on Deck, with handheld frame-rate caveat ↗
A 60 Hz TV only offers 30 Hz on this connection
Check the rating of the specific HDMI input; different inputs on the same TV can have different limits. Connect the dock to the port that supports your chosen resolution at 60 Hz, then check the refresh rate offered by the display. The reported output refresh rate describes the signal, not the number of game frames the depot actually renders.
Changing to a television makes the same busy shift slower
The dock does not increase the Deck’s rendering power. Check whether docking also raised the game’s render resolution. Lower it for one trial and revisit the same loaded warehouse, leaving the machine settings unchanged. If the shift becomes smoother, the extra pixel workload contributed. One player finishing on Deck does not establish a guaranteed docked frame rate.
Valve: hardware and performance while docked ↗
Potato Please: a player reports finishing a shift on Deck, with handheld frame-rate caveat ↗
The wireless controller drops only when a USB drive is connected
Try the same in-game action with the drive or capture device disconnected, then reconnect it farther from the Deck and wireless receiver. Valve documents possible radio interference from high-speed USB peripherals. A stable controller after moving the accessory points to the dock setup. If it also fails when handheld with no peripherals, test the controller separately.
Valve: docking, display and input troubleshooting ↗
Potato Please: a player reports finishing a shift on Deck, with handheld frame-rate caveat ↗
Tell a slow-charge warning from a game slowdown
If the warning appears after plugging in the dock, check that the charger is connected to the hub’s USB-C power-delivery input. A hub can reserve power for its own devices. Disconnect unneeded peripherals and compare charging while the same shift is open; a change in the charging warning does not itself show that the game’s frame rate changed.
Sources
- Valve: docking, display and input troubleshooting help.steampowered.com
- Valve: official dock port layout in pictures www.steamdeck.com
- Potato Please: a player reports finishing a shift on Deck, with handheld frame-rate caveat steamcommunity.com
- Valve: hardware and performance while docked www.steamdeck.com