Streaming from Bazzite PC (with Sunshine) in non-native resolution looks messed-up

[jonnypanic]

I asked around on the Discord, but think not many other people have had this issue, yet.

Describe the Bug:
Using a Bazzite Desktop to stream to Steam Deck, in game mode, if I choose any non-native resolution in-game, many games will display in a smaller window in the top left corner, surrounded by a garbled image. The same will happen to Steam itself if the resolution is changed to non-native.
This is exactly the same issue as posted here:
LizardByte/Sunshine#2646
The Sunshine devs seem to think it's a Moonlight issue.
Desktop mode does not have this issue, it all works fine.

Steps to reproduce
Stream from Bazzite in Gamemode with native resolution set in Steam, and run a game at lower than native resolution. UE games in particular seem to have trouble, as well as RE engine games.

Screenshots
I don't have a screenshot but there is one on here:
LizardByte/Sunshine#2646

Affected games
Mainly UE and RE engine, it seems, of the games I have tried. Some examples being Robocop, Hi-Fi Rush, Resident Evil 8, Resident Evil 4.

Moonlight settings (please complete the following information)

• Have any settings been adjusted from defaults?
• If so, which settings have been changed?
• Does the problem still occur after reverting settings back to default?

Problem occurs with default settings. I tried reinstalling and wiping settings, but it persists.

Client PC details (please complete the following information)

• Steam Deck
• SteamOS: latest beta (3.6.8)
• Moonlight Version: 6.1.0
• Linux package type (if applicable): Flatpak

Server PC details (please complete the following information)

• OS: Bazzite Fedora 40
• Sunshine 2024.911.215654.copr
• GPU: AMD 6750 XT
• Linux package type (if applicable): Flatpak
• GPU Driver: Mesa 24.2.3

Moonlight Logs (please attach)
In desktop mode, Moonlight works fine so I don't think that would help, not sure how to get logs when running Game Mode

Additional context
A simple workaround is to not run the game at lower than native resolution, but of course performance will be affected. I'm streaming from a PC connected to a 4K TV, so I can't run everything at native. If anyone could help work this out, I'd be grateful.

Thanks.

[cgutman]

Since you say it depends on resolution on the host computer, that's not something Moonlight would have any knowledge of. I reopened the issue on the Sunshine side.

[jonnypanic]

Got it, thanks. Hope it can get sorted on the Sunshine side.