(withdrawn)#315
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…host fix (#314) Some MediaTek Android xhci/usbfs stacks (Dimensity 810, Helio G99, MT6765) never complete a bulk-IN read larger than 16 KB — LIBUSB_ERROR_TIMEOUT forever, zero RX with a green init (OpenIPC/PixelPilot#6). floppyhammer's #19 fixed this with 16 KB host reads plus ≤16 KB device-side RX aggregation; the async-ring rewrites (#158/#164/#168) and the #213 transport split (40e3a2a) kept the aggregation half but regressed the host reads to 32 KB URBs on every 11ac generation. PixelPilot#104 shipped the first Android build of the async ring and the no-video reports came straight back. - Jaguar1/2/3 RX rings: 16 KB URBs (DeviceConfig::Rx::urb_bytes, env DEVOURER_RX_URB_BYTES, clamped >= 4096). Free on healthy hosts: with aggregates capped ≤16 KB a 32 KB URB never filled past 16 KB anyway — each aggregate ends its URB via short packet. - Jaguar2/3 halmac agg page-threshold 0x05 (20 KB) -> 0x03 (≤12 KB): an aggregate must never span two URBs or the next_offset walk breaks. Deliberate divergence from the kernel's 0x05, documented at both sites. - Kestrel untouched: the 8852C RXAGG LEN_TH (~20 KB) requires its 32 KB ring; the knob is documented as 11ac-only. - Docs: CLAUDE.md hardware gotcha + performance-tuning.md lever entry. ctest 36/36. Desktop bench (regress 2x2, goodput A/B) and on-device MTK validation via PixelPilot#6 volunteers tracked in #314. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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