[Bug] System Dialogs & Secure Overlays (OSK/Prompts) fail to render in xHome (Remote Play) #55
Description
Description
When a system-level prompt is triggered during an xHome (Remote Play) session, the stream enters a "Dimmed" state as expected, but the actual System UI elements (Dialog boxes, confirmation prompts, On-Screen Keyboard) remain invisible or transparent.
Environment
- Device: Steam Deck (OLED/LCD)
- OS: SteamOS
- Renderer: Vulkan
- Connection Type: xHome (Remote Play)
Steps to Reproduce
- Start an xHome Remote Play session.
- Navigate to "Manage Game and Add-ons" -> "Saved Data".
- Select a save file and press [A] to delete.
- Observe: The screen dims, but no selection menu/confirmation box appears.
- Press the Nexus/Xbox button: The file management state changes (files will be deleted), confirming the menu was active but invisible.
Expected Behavior
A system-level pop-up box (Secure Overlay) should render over the game feed, as seen in Better xCloud.
Comparison & Experimental Data
This issue appears to be a protocol-level failure in requesting or compositing the System UI Plane during the xHome handshake.
- Better xCloud (Official Web-API): System popups render correctly on the remote stream (Steam Deck) but remain invisible on the host TV. This confirms the Xbox is capable of rendering the layer into a stream.
- XStreaming (xHome Protocol): The popups are invisible on both the stream and the host TV.
- Inference: This suggests the app is triggering a "Protected Content" or "Game-Only" capture state in the xHome handshake that suppresses the host console from rendering the System UI plane entirely, rather than a failure of the local Vulkan renderer.
Additional Context
This also affects the OSK (On-Screen Keyboard). In titles like Hogwarts Legacy, triggering a text input field (e.g., character naming) dims the screen but fails to render the Xbox keyboard or trigger the SteamOS virtual keyboard.