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

[bugzilla-daemon@kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=216382

            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.

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