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Three things kept Valve's mangoapp from drawing the overlay in a session: - GLFW 3.4 takes XDG_SESSION_TYPE=wayland with WAYLAND_DISPLAY set as Wayland-only, and mangoapp needs gamescope's X server; the wrapper sets XDG_SESSION_TYPE=x11. - On a Qualcomm display driver it opens a tracefs instance for the GPU memory total and aborts when that fails, which it always does for an Android app. The session preload now places the instance in an empty directory of its own when the real one cannot be made. - gamescope sends it each frame's timings through a System V message queue, and Android kernels have no System V IPC. sysv.c now emulates the queue operations gamescope and mangoapp use, beside its semaphores and shared memory.