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Link drops: restoring PD costs ~2.2 s with the tablet awake

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Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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mikkeli
2026-10-09 00:46:34 +09:00
parent 5c7c0677cb
commit feb9564ce4
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@@ -149,7 +149,7 @@ re-dialling is the client's job. Noticing the loss and redelivering is the Orin'
Measured on the USB path (tablet ↔ PD hub ↔ Orin, 2026-10-09): cutting PD power Measured on the USB path (tablet ↔ PD hub ↔ Orin, 2026-10-09): cutting PD power
resets the hub's data port, and the link is back within ~3.5 s with no resets the hub's data port, and the link is back within ~3.5 s with no
intervention. In the car that happens at every ignition change, cranking intervention; restoring it costs ~2.2 s (a gadget reconnect, no detach). In the car that happens at every ignition change, cranking
included. Longer outages measured early on were the tablet sleeping on battery, included. Longer outages measured early on were the tablet sleeping on battery,
not the link. Design for drops as normal operation. Requirements, not yet implemented: not the link. Design for drops as normal operation. Requirements, not yet implemented:
@@ -161,7 +161,7 @@ not the link. Design for drops as normal operation. Requirements, not yet implem
nothing. nothing.
- **The app keeps the tablet awake while it is the display.** Off charger, Android - **The app keeps the tablet awake while it is the display.** Off charger, Android
suspends about a minute after screen-off. Then the link is gone in every way that suspends about a minute after screen-off. Then the link is gone in every way that
matters. Kept awake, a PD change costs only ~3.5 s (measured). matters. Kept awake, a PD change costs only 2–3.5 s (measured).
- **Downstream (latest-wins):** unchanged. On reconnect, push current state; no - **Downstream (latest-wins):** unchanged. On reconnect, push current state; no
resend, since stale samples are worthless. resend, since stale samples are worthless.
- **Reliable channel (TTS chunks, acknowledgements):** pending items survive a - **Reliable channel (TTS chunks, acknowledgements):** pending items survive a