Title: [A2DP] Regression in Bluetooth Stream Initialization – RC 20251119_1643_RC07

dug44 — Tue, 31 Mar 2026 19:32:24 GMT

Problem: 2-5 second audio stutter/buffer underrun at the start of every track when using an external Bluetooth default speaker.
Environment & Baseline:
Working Build: 3.77.510748 (Stable) — No stutter observed on identical hardware.
Broken Build: 20251119_1643_RC07 (Public Preview) — Stutter occurs consistently at track transitions.
Hardware: Nest Mini (2nd Gen) connected to external BT receiver (Yamaha R-S202 / UGREEN BT 6.0).
Technical Analysis: This appears to be a regression in the A2DP carrier keep-alive logic. The RC firmware seems to be dropping the Bluetooth sync during the silence between tracks, causing the receiver to re-handshake when the next track begins. The 200ms group delay correction does not mitigate the issue.
Ask: Investigate A2DP packet priority and buffer initialization timing in the RC branch compared to the 3.77 production branch.

Re: Title: [A2DP] Regression in Bluetooth Stream Initialization – RC 20251119_1643_RC07

moralesvicente — Tue, 28 Apr 2026 20:00:15 GMT

Hello @dug44,

Thanks for posting here in the community forum. I understand that you’re experiencing audio stuttering and buffer under-runs at the start of every track when using an external Bluetooth speaker as your default connected to a Nest Mini (2nd gen). I appreciate the detailed information you've provided; it’s a pleasure to assist you.

To troubleshoot this effectively, please answer the following questions:

When did this issue start?
Do you have other speakers or displays experiencing the same problem?
What troubleshooting steps have you performed so far? (Please describe them in detail if possible).

I look forward to your reply.

Cheers,

Daniel

topic Title: [A2DP] Regression in Bluetooth Stream Initialization – RC 20251119_1643_RC07 in Speakers and Displays

Title: [A2DP] Regression in Bluetooth Stream Initialization – RC 20251119_1643_RC07

Re: Title: [A2DP] Regression in Bluetooth Stream Initialization – RC 20251119_1643_RC07