Sunshine streaming suddenly causes wild color artifacts with webOS client since v2026.906.222525

Nobody has claimed this yet.

### Is there an existing issue for this?

- [x] I have searched the existing issues

### Is your issue described in the documentation?

- [x] I have read the documentation

### Is your issue present in the latest beta/pre-release?

This issue is present in the latest pre-release

### Describe the Bug

Sunshine streaming has worked fine, but now shows artifacts like his one (moving around, this is not static):

* HDMI output is fine
* I tried a different moonlight client, it also seems to work fine (but also has lower resolution)

**Also tested in pre-release:**

### Expected Behavior

No streaming artifacts.

Also, this has been working fine/flawlessly for weeks or so. So something must have caused this.

Also notice I already tried the following:
* restart server
* restart client (moonlight)/TV
* re-configure it aka run the sunshine install script

### Additional Context

system logs (journalctl): https://gist.github.com/rugk/7e62c00791281de897d6c32d1498ce04#file-journalctl-log

### hardware
Operating System: Bazzite 44
KDE Plasma Version: 6.7.4
KDE Frameworks Version: 6.29.0
Qt Version: 6.11.2
Kernel Version: 6.18.49-ogc1.1.fc44.x86_64 (64-bit)
Graphics Platform: Wayland
Processors: 8 × Intel® Core™ i7-7700 CPU @ 3.60GHz
Memory: 16 GiB of RAM (15.6 GiB usable)
Graphics Processor: NVIDIA GeForce GTX 1060 6GB
Manufacturer: MSI
Product Name: MS-7A70
System Version: 2.0

[bootc.txt](https://github.com/user-attachments/files/32020225/bootc.txt)

```
$ rpm-ostree status -b
State: idle
BootedDeployment:
● ostree-image-signed:docker://ghcr.io/ublue-os/bazzite-nvidia:stable
Digest: sha256:4db780617374e5cc883178d2182ff8b2d4d268a22904c8d51dffde2175ad74a7
Version: 44.20260908 (2026-09-08T00:21:01Z)
$ flatpak info dev.lizardbyte.app.Sunshine
Sunshine - GameStream host for Moonlight

ID: dev.lizardbyte.app.Sunshine
Ref: app/dev.lizardbyte.app.Sunshine/x86_64/stable
Arch: x86_64
Branch: stable
Version: 2026.906.222525
License: GPL-3.0-only
Origin: flathub
Collection: org.flathub.Stable
Installation: system
Installed Size: 112.7 MB
Runtime: org.kde.Platform/x86_64/6.10
Sdk: org.kde.Sdk/x86_64/6.10

Commit: 3633e5e0f19889877f50d22d60ae7a6dde732d02d9d1cd201fe8130ed4908abe
Parent: 62e90ef28d2c760d77e85233e1c5754c29f56e430b726947cdd79867915901e2
Subject: chore: Update dev.lizardbyte.app.Sunshine to v2026.906.222525 (#195) (4d776fe270f4)
Date: 2026-09-07 14:25:09 +0000
```

* NOTE: Also booted into 44.20260902 (2026-09-02) and it is also reproducible there

[sunshine-stable.log](https://github.com/user-attachments/files/32020252/sunshine.log)

Maybe relevant is this error from the logs (it's _below_ the line "ignore any errors above"):
> [2026-09-09 20:13:16.920]: Error: BT.2020 SDR colorspace expects 10-bit color depth, falling back to Rec. 709

```
$ glxinfo|grep version
server glx version string: 1.4
client glx version string: 1.4
GLX version: 1.4
OpenGL core profile version string: 4.6.0 NVIDIA 580.173.02
OpenGL core profile shading language version string: 4.60 NVIDIA
OpenGL version string: 4.6.0 NVIDIA 580.173.02
OpenGL shading language version string: 4.60 NVIDIA
OpenGL ES profile version string: OpenGL ES 3.2 NVIDIA 580.173.02
OpenGL ES profile shading language version string: OpenGL ES GLSL ES 3.20
GL_EXT_shader_group_vote, GL_EXT_shader_implicit_conversions,
```

Client:
Moonlight 1.6.36 (com.limelight.webos) see https://repo.webosbrew.org/apps/com.limelight.webos/
webOS25 (10.3.0-2502)

Client infos:

I am not sure I selected the correct capture method below, may or may not be the correct one, but I guess as installed via flatpak it is this. I do not see any settongs about it.

### Host Operating System

Linux

### Operating System Version

Bazzite 44.20260908

### Architecture

amd64/x86_64

### Package

Linux - flathub/flatpak

### GPU Type

NVIDIA

### GPU Model

NVIDIA GeForce GTX 1060 6GB

### GPU Driver/Mesa Version

I don't really know how to find out, but see `glxinfo` output above, so probably 1.4(?)

### Capture Method

XDG Portal Grab (FreeBSD/Linux)

### Apps

```json
N/A
```

### Log output

```shell
see below for logs with pre-release (stable logs also uploaded as file above)
```

### Online logs

https://gist.github.com/rugk/7e62c00791281de897d6c32d1498ce04#file-sunshine-log

### Extra information

[bootc.txt](https://github.com/user-attachments/files/32020225/bootc.txt)

```
$ rpm-ostree status -b
State: idle
BootedDeployment:
● ostree-image-signed:docker://ghcr.io/ublue-os/bazzite-nvidia:stable
Digest: sha256:4db780617374e5cc883178d2182ff8b2d4d268a22904c8d51dffde2175ad74a7
Version: 44.20260908 (2026-09-08T00:21:01Z)
$ flatpak info dev.lizardbyte.app.Sunshine
Sunshine - GameStream host for Moonlight

ID: dev.lizardbyte.app.Sunshine
Ref: app/dev.lizardbyte.app.Sunshine/x86_64/stable
Arch: x86_64
Branch: stable
Version: 2026.906.222525
License: GPL-3.0-only
Origin: flathub
Collection: org.flathub.Stable
Installation: system
Installed Size: 112.7 MB
Runtime: org.kde.Platform/x86_64/6.10
Sdk: org.kde.Sdk/x86_64/6.10

Commit: 3633e5e0f19889877f50d22d60ae7a6dde732d02d9d1cd201fe8130ed4908abe
Parent: 62e90ef28d2c760d77e85233e1c5754c29f56e430b726947cdd79867915901e2
Subject: chore: Update dev.lizardbyte.app.Sunshine to v2026.906.222525 (#195) (4d776fe270f4)
Date: 2026-09-07 14:25:09 +0000
```

* NOTE: Also booted into 44.20260902 (2026-09-02) and it is also reproducible there

[sunshine.log](https://github.com/user-attachments/files/32020252/sunshine.log)

Maybe relevant is this error from the logs (it's _below_ the line "ignore any errors above"):
> [2026-09-09 20:13:16.920]: Error: BT.2020 SDR colorspace expects 10-bit color depth, falling back to Rec. 709

Client:
Moonlight 1.6.36 (com.limelight.webos) see https://repo.webosbrew.org/apps/com.limelight.webos/
webOS25 (10.3.0-2502)

resolution: 3840*2160 (native), 60fps
video bitrate 45000kbps

----

More information:
* Funnily, **if I enable HDR in monlight** _it gets better_ aka there are only "smaller" artifacts:

* Also, if I choose 30 FPD in moonlight, it also seems work even **much better**. Here HDR + 30FPS - the artifacts are only really visible on a black screen:

* Full HD aka 1920x1080 also seems to work fine

----

Also reported upstream: https://github.com/ublue-os/bazzite/issues/5765
**Edit:** Also made moonlight client authors aware of this: https://github.com/mariotaku/moonlight-tv/issues/629

Start with the attached sunshine.log and journalctl output, then reproduce using XDG Portal Grab at 3840x2160 and 60 FPS on the listed NVIDIA/Linux setup. Trace the BT.2020 SDR colorspace warning and compare HDR, 30 FPS, and 1080p behavior; done means webOS streaming no longer shows moving color artifacts without those workarounds.

Written by the indexing model from the issue text.