[Bug 216382] New: [bisected][regression] mediatek bluetooth 13d3:3563 (mt7921e) doesn't work with audio devices.

bugzilla-daemon
2022-08-19T16:56:55Z

Bug ID: 216382
Summary: [bisected][regression] mediatek bluetooth 13d3:3563
(mt7921e) doesn't work with audio devices.
Product: Drivers
Version: 2.5
Kernel Version: 6.0-rc1
Hardware: All
OS: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: Bluetooth
Assignee: linux-bluetooth@vger.kernel.org
Reporter: arek.rusi@gmail.com
Regression: No

After update to new 6.0rc1 I can't use any bt-earphones.
I've checked in bluetoothctl: devices are still connected but none of
endpoint/transport entries are creates.

XB1S gamepad works without any issues.

bisecting result:
---
26afbd826ee326e63a334c37fd45e82e50a615ec is the first bad commit
commit 26afbd826ee326e63a334c37fd45e82e50a615ec
Author: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
Date: Mon Jul 29 18:15:43 2019 +0300

Bluetooth: Add initial implementation of CIS connections

This adds the initial implementation of CIS connections and introduces
the ISO packets/links.
---

can't revert this commit.

*Aditionally, I've tried this kernel on second machine with AX210 wifi/bt combo
and issue doesn't appear. So I assume problem is limited to mediatek module.