alan
6f7f7ddd6c
The bar turned green after 2 s on a timer even when the microphone delivered nothing. It now turns green only on real audio: RMS above 0.0005, or three consecutive chunks that are not digital silence (the virtual mic emits one stray nonzero chunk right after start, and a Bluetooth headset's floor ramps in from a few LSB). Measured 1.2-1.4 s after the key, within 0.14 s of the first real samples. diagnostics/bluetooth/ records how startup went from ~1.6 s (or never) to ~1.1-1.4 s: a btusb driver bug, two PipeWire bluez5 bugs, a 500 ms WirePlumber switch timeout and an over-broad auto-connect rule. Those fixes are machine level and live outside this repo; the patches, tools and measurements are here. STARTUP-TIME.md is the summary and explains the ~0.9 s hardware floor. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01Xoc9DJCViR7dg9eKzzAcfQ
73 lines
3.1 KiB
Diff
73 lines
3.1 KiB
Diff
From: Alan Silva <alanfortlink@gmail.com>
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Subject: [PATCH] Bluetooth: btusb: switch the isoc interface on every SCO enable notification
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hci_conn_num(hdev, SCO_LINK) also counts (e)SCO links that are still being
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set up, since hci_connect_sco() adds them to the connection hash before the
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Synchronous Connection Complete event arrives. btusb_notify() only compares
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that count with data->sco_num and stores whatever event it was called with
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as the air mode. Two things go wrong when an unrelated connection event
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arrives while an (e)SCO link is pending:
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1. The unrelated event (e.g. HCI_NOTIFY_CONN_DEL from a failed ACL page to
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another device) changes the count from 0 to 1, so btusb_work() runs
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with air_mode = HCI_NOTIFY_CONN_DEL, computes new_alts = 0 and submits
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isochronous URBs on the alternate setting 0 endpoints, whose
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wMaxPacketSize is 0. usb_submit_urb() fails with -EMSGSIZE:
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Bluetooth: hci0: urb 00000000d42f828b submission failed (90)
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and BTUSB_ISOC_RUNNING is cleared again.
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2. When HCI_NOTIFY_ENABLE_SCO_TRANSP finally arrives for that link, the
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count already equals data->sco_num, so nothing is scheduled. The
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interface stays on alternate setting 0, no isochronous URBs are
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submitted, and the SCO link carries no audio in either direction for
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its whole lifetime. The user sees a working headset with a dead
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microphone.
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Reproduced on an Intel AX210 (8087:0032) with a Sony WH-1000XM5 and
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PipeWire 1.6.8: PipeWire re-tries ConnectProfile() on absent paired devices
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when it starts, bluetoothd pages them, the page times out (status 0x04)
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while dictation opens the headset microphone, and the mSBC link comes up
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silent. Traced with kprobes on btusb_notify/btusb_work/btusb_submit_isoc_urb.
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Program the alternate setting on every ENABLE_SCO_* notification, and on
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other events only react when links went away.
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---
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--- a/drivers/bluetooth/btusb.c 2026-09-09 02:54:49.664029766 +0100
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+++ b/drivers/bluetooth/btusb.c 2026-09-09 02:55:52.408391149 +0100
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@@ -2289,13 +2289,33 @@
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static void btusb_notify(struct hci_dev *hdev, unsigned int evt)
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{
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struct btusb_data *data = hci_get_drvdata(hdev);
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+ int sco_num = hci_conn_num(hdev, SCO_LINK);
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BT_DBG("%s evt %d", hdev->name, evt);
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- if (hci_conn_num(hdev, SCO_LINK) != data->sco_num) {
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- data->sco_num = hci_conn_num(hdev, SCO_LINK);
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+ switch (evt) {
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+ case HCI_NOTIFY_ENABLE_SCO_CVSD:
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+ case HCI_NOTIFY_ENABLE_SCO_TRANSP:
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+ /* A (e)SCO link just came up: program the isochronous
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+ * alternate setting for its air mode, even if the link was
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+ * already counted while it was still being set up.
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+ */
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+ data->sco_num = sco_num;
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data->air_mode = evt;
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schedule_work(&data->work);
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+ break;
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+ default:
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+ /* hci_conn_num() also counts (e)SCO links that are still
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+ * being set up, and only the ENABLE_SCO_* notifications
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+ * carry an air mode. Any other event may only tear the
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+ * isochronous interface down or adjust it for fewer links;
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+ * a pending link is handled once it is enabled.
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+ */
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+ if (sco_num < data->sco_num) {
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+ data->sco_num = sco_num;
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+ schedule_work(&data->work);
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+ }
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+ break;
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}
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}
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