The412Banner
ebf5da9840
On a fresh install the client starts signed out and drops the steam://install/4427310 the session hands it, so the Proton Experimental (ARM64) dialog only appeared after the user restarted the client by hand. Ported from Bannerlator's session (device-proven there 2026-09-22): - With no remembered sign-in, a watcher on logs/connection_log.txt waits for the sign-in to complete and asks the running client again. - A watcher on appmanifest_4427310.acf waits for StateFlags 4, registers the compatibility tool again, leaves ~/.bl-restart-once and asks the client to -shutdown; the start loop sees the marker and starts it once more (not counted against the update cap), so the tool lists and defaults are current before the user installs a game. - The client-branch check runs before every start, not once, since the client rewrites package/beta during its run. The loading screen no longer says Steam keeps running in the background: sessions pause when the app leaves the screen (Background behavior).
DroidDeck
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.