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Cemu never showed a frame on DroidDeck: its Getting Started dialog blocked every first launch (the folder picker cannot reach ROMs), the session's controller helper aborted it, and the desktop's Vulkan renderer drew no cursor. With the Turnip KGSL fix in the driver and the haptic-optional Cemu in the catalog, this makes the app side complete: - bannerlator-pad-defaults seeds Cemu's settings.xml once: the Wii U games folder, Vulkan, and Cubeb audio on the default device for both the TV and the GamePad speaker at full volume (Wipeout 3 plays through the GamePad; Cemu's own default is 20 %). - The Cemu tile launches full screen (-f). - libfakeinput.so is preloaded into every session process and exported its static C++ runtime (~7000 symbols); programs unwound through it and aborted (shadPS4 in pthread_exit, Cemu's controller thread). Link with --exclude-libs,ALL, and fail the build if the runtime leaks out again. - On the Vulkan and GLES desktops the pointer worked but no cursor was drawn: wlroots hands the cursor to the app's compositor, which draws none. WLR_NO_HARDWARE_CURSORS=1 makes labwc composite it itself. Device-tested on the FIT: Super Mario 3D World in-game at 35-37 fps with sound, Deus Ex HR DC and Wipeout 3 launch with sound; RPCS3, Dolphin and a Steam session (FlatOut) unchanged on the same driver.
Run Valve's native ARM64 Steam client on an Adreno Android device. Steam runs in a Linux runtime under proot, with gamescope and an in-app Vulkan compositor. Windows games use Valve's ARM64 Proton and FEX. A desktop with LXQt, Firefox, and emulators is also available.
Requirements and install
Use Android 9 or newer on a supported Adreno device (730 or newer, or 8xx). Mali, Xclipse, PowerVR, and Adreno 710 are unsupported. No root is required. Allow about 3 GB for the runtime and 1.1 GB more for the desktop and emulators. Install the APK from Releases, install the Linux runtime, then press Play and sign in. Steam downloads on first launch. Install Desktop & apps to use the desktop and emulators.
On Android 12+, if Steam exits without a log, turn off Restrict child processes in Developer options.
Build
Run tools/build_local.sh with Docker, Java 17, the Android SDK/NDK, and zstd installed. It builds the ARM64 audio sinks from PulseAudio 13.0 and packages them into the APK at app/build/outputs/apk/release/app-release.apk. Set DROIDDECK_PA13_SOURCE_DIR to an existing PulseAudio 13.0 source directory to skip downloading it. To install the APK on an attached device, run tools/deploy_local.sh.
Limits
Compatibility and performance vary by device; hardware validation is limited. Desktop compositing uses software rendering. Firefox sandboxing is reduced under proot. See the session logs in Download/DroidDeck/ when diagnosing problems.
Credits and licence
GPL-3.0. Runtime, shim, input, and controller work build on WinNative and Bannerlator (maxjivi05). See LICENSE. Steam and Proton belong to Valve Corporation; this project is not affiliated with Valve.