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setMMapEnabled(true) doesn't mean "allow it", it sets the process's MMAP policy to AUTO, overriding a device whose aaudio.mmap_policy disables MMAP. Since #22766 we did that on every audio start, and a Xiaomi Pad 5 Pro (Android 13) has been stuck on a blank screen at launch since then. The likely cause, not yet confirmed on the device: opening a stream on a MMAP path the vendor turned off, from the UI thread. Now the checkbox can only turn MMAP off, as on the Bluetooth TV. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>