Add steamdeck streaming post

Author: gamingrobot

content/posts/steamdeck-linux-streaming/index.md

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+---
+title: Streaming games to the Steam Deck
+description: Setting up Sunshine and Moonlight for streaming to the Steam Deck
+date: 2025-12-12
+slug: steamdeck-linux-streaming
+taxonomies:
+  tags:
+    - Linux
+---
+
+My notes for setting up Steam Deck remote game streaming using [Sunshine](https://docs.lizardbyte.dev/projects/sunshine/) and [Moonlight](https://moonlight-stream.org/) and a custom [EDID](https://en.wikipedia.org/wiki/Extended_Display_Identification_Data). 
+
+<!-- more -->
+
+Sunshine is a game stream host running on my desktop (Fedora 43 KDE Desktop with an NVIDIA graphics card), and Moonlight is the client running on the Steam Deck. I decided to use Sunshine/Moonlight due to latency issues with Steam Remote Play.
+
+Fedora KDE Desktop uses Wayland, which adds some complexity when trying to match the Steam Deck resolution and refresh rate. Since the Steam Deck is using a 16:10 aspect ratio (1280x800), when streaming from a 16:9 display, there will be black bars on the top and bottom of the screen.
+
+With X11 you can use `xrandr` (`wlroots` based Wayland compositors can use `wlr-randr`) to specify a custom resolution and refresh rate (display mode). Under KDE with Wayland, `kscreen-doctor` only supports setting the display mode to one that is supported by the display. We can get around this by using a custom [EDID](https://en.wikipedia.org/wiki/Extended_Display_Identification_Data), either with a dummy display dongle or using `drm.edid_firmware` to specify a custom EDID.
+
+
+## Setup Sunshine and Moonlight
+
+I set up Sunshine using the Fedora COPR; detailed install instructions are [here](https://docs.lizardbyte.dev/projects/sunshine/latest/md_docs_2getting__started.html). Then I set up Moonlight on my Steam Deck as a Flatpak, following [this guide](https://www.xda-developers.com/how-install-use-moonlight-steam-deck/).
+
+
+## Testing Normal Streaming
+
+Confirm everything is working normally by streaming to the Steam Deck and seeing the 16:9 aspect ratio.
+
+
+## Custom EDID
+
+{%warning()%}Custom EDIDs should be safe, but I'm not responsible for your hardware.{%end%}
+
+1. Plug the monitor into a Windows machine and use [Custom Resolution Utility](https://www.monitortests.com/forum/Thread-Custom-Resolution-Utility-CRU). On Linux, [wxEDID](https://flathub.org/en/apps/net.sourceforge.wxEDID) might work to edit the EDID, but CRU was easier to use.
+2. Add a new `Standard Resolution` of `1920x1200` (the native resolution of `1280x800` also works, but I got better results with `1920x1200`) and a refresh rate of `90` for the OLED Steam Deck or `60` for the LCD version.
+3. Export the modified EDID from Custom Resolution Utility and transfer it to Linux.
+4. Save that modified EDID to `/usr/lib/firmware/edid/custom-edid.bin`
+5. Use `kscreen-doctor -o` to get the primary display port name and current display mode.
+6. Add the kernel argument `sudo grubby --update-kernel=ALL --args="drm.edid_firmware=<port-name>:edid/custom-edid.bin"`, replacing `<port-name>` with the port from the previous step (it should be `DP-X` or `HDMI-A-X`)
+
+
+## Update Sunshine Application Settings
+1. Set up a new application
+    1. Set the Do Command to `kscreen-doctor output.<port-name>.mode.<resolution>@<refresh-rate>`, replacing `<resolution>` and `<refresh-rate>` from the above Step 2.
+    2. Set the Undo Command to `kscreen-doctor output.<port-name>.mode.<current-mode>`, replacing `<port-name>` and `<current-mode>` from the above Step 5.
+    3. (Optional) If you want Steam Big Picture to close when you stop streaming, add a new Undo Command `setsid steam steam://close/bigpicture`
+{{ img(src="sunshine-settings.webp", alt="" link="") }}
+
+
+## Reboot and Test
+
+Reboot and test streaming; it should now be in the 16:10 aspect ratio (your monitor will turn off due to an unsupported mode).