Dual Screen Mode Turns a Steam Deck Into a Wii U GamePad, and the Catch Is Which Machine Runs It

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2026-11-04 · News and analysis

Affiliate disclosure: This article contains affiliate links. As an Amazon Associate, we earn from qualifying purchases at no extra cost to you. Learn more.

A project called Dual Screen Mode appeared on 2 November 2026 and the pitch is a good one. It turns a Steam Deck into a wireless second screen with controls, which is to say it turns it into a Wii U GamePad. Point it at Cemu and you get the real two screen Wii U layout. Point it at a DS or 3DS emulator and you get a real bottom screen.

That is a genuine gap being filled, and we have written about the gap ourselves. Our Cemu setup guide has said for months that Cemu's Separate GamePad View is clunky on a single handheld screen, and that touch heavy Wii U games are the weakest fit for handheld play. This is the first packaged answer to that.

But almost every write up so far has the setup backwards, and the direction matters more than anything else here. Your Steam Deck is the second screen. It is not the machine running the game. The machine running the game has to be a separate Linux PC. If your gaming PC runs Windows, this project does nothing for you today.

Here is what it actually is, what it needs, and who it is really for.

The Short Version

It is a setup wizard and a desktop toggle, not new technology. Every piece it uses already existed.
It bundles KDE's virtual monitor, Sunshine and Moonlight into one install with no terminal work.
The handheld is the client. It receives a stream. A separate PC is the host.
The host must be SteamOS or an Arch based Linux distro running KDE Plasma on Wayland.
Ubuntu, Fedora, GNOME and X11 are not supported by the installer. Neither is Windows.
The host has to stay in KDE Desktop Mode the whole time the second screen is live.
The client can be a Steam Deck, another PC handheld, a tablet or a phone. Anything that runs Moonlight.
Current version is v0.1.4-beta, published 2 November 2026, MIT licensed.
The creator calls it a one person beta, tested mainly on a Steam Machine and a Steam Deck.
No gyro and no microphone forwarding. The "Both" audio option is still unfinished.
No latency figures have been published. This is a video stream, so lag is in the loop.

What It Actually Does

Dual Screen Mode does three things on the host machine. It creates a virtual display that does not physically exist, it configures Sunshine to stream that virtual display, and it drops shortcuts on your desktop to switch the whole thing on and off.

Then you pick up your handheld, open Moonlight, connect to the host, and that virtual display shows up in your hands. Enable gamepad mode in Moonlight and the handheld's sticks and buttons go back to the host as controller input. Screen out, controls in. That is a GamePad.

The clever part is not the technology. It is that this was always possible and almost nobody did it, because doing it meant stitching together scattered guides, forum posts and terminal commands. The project's own framing is that it exists so you do not have to piece that together. Install, click, play.

The use cases the creator lists:

Cemu, with the Wii U GamePad screen on the handheld and the TV screen on your monitor
DS and 3DS emulators, including Azahar, with the bottom screen in your hands
A plain wireless monitor, with no emulation involved at all

That last one is worth noting. This is not locked to emulation. It is a wireless second display that happens to also send controller input.

The Direction Trap

This is the part to get right before you spend an evening on it.

Read "turns your Steam Deck into a Wii U GamePad" quickly and you will picture running Cemu on the Deck and using the Deck's own screen as the GamePad. That is not what this is. A single screen cannot be two screens.

What you need is two machines:

A host. A Linux gaming PC running SteamOS or Arch, with KDE Plasma on Wayland. This runs Cemu.
A client. The Steam Deck, or a phone, or a tablet. This is the GamePad.

Both have to be on the same local network.

So the honest summary is that recreating the Wii U takes what the Wii U took. A box doing the work, and a screen in your hands talking to it. The Deck is the screen.

And the host requirement is strict in a way that rules out most people. The installer explicitly does not support Ubuntu, Fedora, GNOME, X11, or anything that is not Arch based with KDE. Windows is not mentioned anywhere as a target. The most common gaming PC in the world cannot be the host.

Who This Is Genuinely For

One configuration fits perfectly, and it is the one the project was built on.

A Steam Machine as the host and a Steam Deck as the client. Valve's Steam Machine shipped on 29 June 2026 at $1,049 and up, and it runs SteamOS with KDE Plasma. It is a Linux box that sits near your TV, which is exactly the Wii U console role. The Deck is already in the house. The creator tested this pairing.

After that, the fit gets narrower:

A desktop or laptop already running SteamOS, Arch, EndeavourOS or Bazzite with KDE. Supported in spirit, and the closest thing to a normal PC that qualifies.
A docked Steam Deck as the host, with your phone as the GamePad. This is the configuration nobody is talking about and the only one that costs nothing. The project's validated host is "SteamOS or another Arch-based Linux installation," and SteamOS is the Deck's own operating system, with KDE Plasma on Wayland in Desktop Mode. So a Deck docked to the TV becomes the console and your phone becomes the GamePad. Be aware that the project does not document or claim to have tested this. It describes the host as "the main Linux PC that runs your games," and a Deck hosting Cemu while also encoding a video stream is doing two demanding jobs at once. Promising, unvalidated.
A Windows gaming PC. Not supported. The underlying parts exist on Windows, Sunshine included, but this installer does not cover it.

If you are in that last group and you still want the result, the pieces are not secret. Sunshine runs on Windows and Moonlight runs on the Deck. You are back to doing it by hand, which is the exact problem this project set out to remove.

The Limitations the Project Admits To

We like a project that writes down its own rough edges, and this one does.

It is a one person beta. Tested primarily with a Steam Machine and a Steam Deck. Broad hardware coverage does not exist yet.
The host stays in Desktop Mode. As long as the virtual display is active, the host cannot be in Game Mode. On a Steam Machine hooked to a TV that is a real change to how you use it.
Touch routing is conditional, and was just patched. It depends on Sunshine exposing a virtual touchscreen and KWin providing the input mapping. Version 0.1.4 specifically fixed touch landing on the host's main monitor instead of the virtual display, so if you read about touch being broken, that was the bug and it is addressed. Whether touch then works inside a given emulator is still up to that emulator.
Touch and controller profiles are per emulator. The project configures the display and the stream. It does not configure Cemu or Azahar for you.
No gyro, no microphone. Neither is forwarded. For DS games that want the mic, that is a dead end.
Audio is half finished. The "Both" option currently behaves the same as Handheld mode.

The Thing Nobody Has Measured

No latency numbers have been published. Not by the project, not by anyone covering it.

That matters, because this is Moonlight. Your second screen is a compressed video stream crossing your wifi, and your button presses are making the return trip. The quality of the experience is the quality of your network, and nothing in the installer changes that.

How much it matters depends entirely on what the second screen is doing:

A map, an inventory, a quest log, a menu. Latency is close to irrelevant. This is the strong case, and it covers most of what the Wii U GamePad actually displayed.
A DS or 3DS bottom screen you tap occasionally. Usually fine. Think menus and item selection.
A stylus driven action game, or anything timing critical on the touch screen. This is where a stream struggles. Rhythm games and real time stylus play are the worst fit.

So the sensible expectation is that this is excellent for second screen information and shaky for second screen reflexes. If someone publishes real measurements we will update this.

Does This Reach a Cheap Handheld?

As a client, a lot of things qualify, and this is the pleasant surprise. Moonlight is the only requirement on the handheld side.

Android retro handhelds run Moonlight from the Play Store. An Anbernic or Retroid Android device works as a second screen.
Phones and tablets work, which is the zero cost way to try the idea before committing.
The cheap Linux handhelds can too, and this surprised us. We checked PortMaster rather than assuming. Moonlight is a PortMaster port, listed as available on 39 devices across every supported firmware, with no hardware requirement attached. That list includes the whole budget Anbernic tier: RG35XX Plus, RG35XX H, RG35XX SP, RG34XX, RG40XX H, RG40XX V, RG28XX and the RG CubeXX, plus the TrimUI Brick and Smart Pro.

So the $40 tier is not locked out of this, which is the opposite of what we assumed when we started writing. The port is specifically described as a client for Sunshine, which is exactly the host software this project configures, so the chain works end to end on paper.

Two honest caveats before you try it. These devices were not built to decode a 1080p video stream, and their wifi radios are usually the cheapest component in the box, so picture quality and input lag are a real question that nobody has measured. And a 3.5 inch screen is a small second screen. The Wii U GamePad was 6.2 inches for a reason.

Miyoo devices are the exception. They are not in PortMaster's availability list for this port, so an OnionOS Miyoo Mini has no route here.

See dual screen handhelds in 2026 for the hardware route to the same goal, which needs no host PC at all.

Hardware Route or Software Route

If what you want is two screens for DS and 3DS games, you now have a choice, and they are not close substitutes.

Buy dual screen hardware. An Anbernic RG DS at around $100 gives you two real screens in one device with no host, no network and no latency. It is self contained and you can use it on a bus. It is also a modest chip, so Wii U is out of reach entirely.

Use Dual Screen Mode. Free, and it scales to whatever your host PC can emulate, which is how Wii U becomes possible at all. It needs a specific Linux host, a good network, two devices powered on, and it stays in the house.

For DS and 3DS, the hardware is the better answer for most people. For Wii U with a real GamePad, this project is the only answer, because no handheld on the market pairs two screens with Cemu class performance.

Check Anbernic RG DS Price on Amazon

Our Take

The technology here is not new and the project does not claim it is. What is new is that someone did the packaging work, and packaging is usually what decides whether a clever setup gets used or stays in a forum thread.

The honest ceiling is the host requirement. An Arch based KDE Wayland host is a small slice of PC gamers, and the project is upfront about that. If a Windows installer ever lands, this goes from a niche tool to something we would recommend broadly.

For now, if you own a Steam Machine and a Steam Deck, this is a weekend well spent and you are the exact person it was built and tested for. If you own a Windows PC and a Steam Deck, keep an eye on it and do not download anything yet.

One last note on expectations. It is version 0.1.4 beta, two days old, maintained by one person. Treat it accordingly.

Frequently Asked Questions

Does Dual Screen Mode run Wii U games on my Steam Deck?

No, and this is the most common misreading. Your Deck becomes the GamePad screen. A separate Linux PC runs Cemu and the game. The Deck shows the second screen and sends your button presses back.

Can I use Dual Screen Mode with a Windows gaming PC?

Not with this project. The installer supports SteamOS and Arch based Linux with KDE Plasma on Wayland, and explicitly does not support Ubuntu, Fedora, GNOME or X11. Windows is not a listed target. The underlying tools do exist on Windows, so the manual route is still open, which is the work this project was created to avoid.

What do I need on the handheld side?

Moonlight, installed and paired with the host separately. That is all. A Steam Deck, an Android handheld, a tablet or a phone all qualify.

Will this work on an Anbernic or Miyoo running ArkOS or muOS?

Better than we first thought. The firmware does not include Moonlight, but PortMaster does, and that port is listed for 39 devices on every supported firmware with no hardware requirement. The budget Anbernic tier is covered, including the RG35XX Plus, RG40XX and RG28XX, as is the TrimUI Brick. Miyoo devices are not in that list, so an OnionOS Miyoo Mini has no route.

What we cannot tell you is how well it performs. These are cheap chips with cheap wifi being asked to decode a video stream, and nobody has measured it. The screen is also small for a second screen.

Is there any input lag?

Yes, because the second screen is a streamed video and your inputs travel back over the network. No measurements have been published. Expect it to be a non issue for maps, menus and inventories, and a real problem for stylus driven or timing critical touch play.

Does it support the Wii U GamePad's gyro?

No. Gyro and microphone forwarding are both absent.

Can I use it as a plain wireless monitor?

Yes. The project is not limited to emulation and lists general desktop use as a supported case. It creates a virtual display and streams it, so anything can be on that display.

Is it safe to install?

It is MIT licensed, open source, and the creator describes it as a one person beta. It also asks for your administrator password during setup to install a missing KDE package. That is normal for what it does, but it is a two day old beta, so judge it as one.

Cemu setup guide, including the GamePad screen problem this project addresses
Wii U emulation on handhelds and what actually runs it
Dual screen handhelds in 2026, the buy hardware route to the same goal
Azahar 3DS setup guide
MelonDS setup guide
Best Wii U games worth revisiting
Steam Deck OLED review

Written 4 November 2026, two days after the project's first release. Requirements and limitations here were read from the project's own documentation and release notes. This is a beta under active development, so the supported platform list is the detail most likely to change.