An idle app takes no loop turn: a session's pump blocks until there is
news for it, wakes and GPU results reach only their own session, and a
hosted app builds no frame while its window has no free shared image. Each
window paces at its own display; a texture pass paints only when its window
can show the result and is exactly its render target at every scale. The
direct compositor renders on the discrete GPU when there is one; Mirror and
Extended switch without an output rebuild. Vulkan: a full GPU never makes an
app fall back, fail or spin; upload arenas are pooled; pipeline variants a
batch needs compile before it; a grab of a hosted window no longer loses the
device; the WM's own device is replaceable and apps hear Event::GpuReset.
Every process lifts its open-file limit. Cameras: retry after a failed
open, rotation kept, a synthetic test camera, Cx::video_inputs. Android:
standalone app APKs run on the HAL again, file video decoding, system back
gestures, audio underruns grow the buffer. Frame tracing names who keeps an
app awake; one main-lag meter for macOS and Linux.
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
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