A sleep of 1 ms or less returns once the AGC driver sees a GPU batch
complete (a thread waits on the recorder's timeline semaphore), runs a
batch's completion actions, or VideoOut completes a flip. A thread
returns early at most 8 times in a run of back-to-back sleeps; the run
restarts when the thread submits AGC work or did not sleep for the
requested time. APS5_NO_SLEEP_WAKE=1 keeps every sleep in full.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
