Scaling Issues On Steam Deck (docked) v4.3.1

[kpervin]

When using Moonlight v4.3.1 on the Steam Deck (in this case docked mode), I experience what almost looks like an underscanned image of the host. Note the performance overlay to give you a sense of the bezels of the display.

Seems to occur in all display modes other than Windowed, though that ends up causing blurry text. Host PC is set to 1440p.

Settings

Basic Settings

• Any resolution/fps
• Full screen/Borderless (does not occur in Windowed)
• [x] Vsync
• [ ] Frame Pacing

Audio Settings

• 5.1
• [x] Mute host
• [ ] Mute audio stream

Ui Settings

• Language: auto
• GUI Display mode: Windowed
• [x] Show connection quality settings
• [x] Keep display awake

Host Settings

• [x] Optimize game settings
• [x] Quit app on host

Advanced Settings

• Video Decoder: auto
• Video Codec: auto
• [ ] HDR
• [ ] Unlock unsupported FPS options
• [x] Automatically find PCs
• [x] Automatically detect blocked connections

Originally posted by @kpervin in https://github.com/moonlight-stream/moonlight-qt/issues/900#issuecomment-1382403249

[cgutman]

My guess is that you're using Sunshine (which preserves aspect ratio when scaling) and also not using resolution that is matched to your host or client. This will lead to both letterboxing and pillarboxing as both Sunshine and Moonlight try to preserve the aspect ratio. You can correct this by either changing your host resolution to match the stream resolution or changing your stream resolution to match your client resolution.

[kpervin]

You are correct that I'm using Sunshine, but apart from that I've tried each resolution in Moonlight's settings and I cannot seem to get rid of this issue. The host machine uses a 2560x1440 monitor, while the TV is 4K. I've tried setting Moonlight's stream resolution to 1440p, 4K, or even 1080p, but to no avail.