[Bug 221524] New: Intel 8265 Bluetooth (8087:0a2b) BLE connectivity regression observed after kernel upgrade.

[bugzilla-daemon@kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=221524

            Bug ID: 221524
           Summary: Intel 8265 Bluetooth (8087:0a2b) BLE connectivity
                    regression observed after kernel upgrade.
           Product: Drivers
           Version: 2.5
          Hardware: All
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P3
         Component: Bluetooth
          Assignee: linux-bluetooth@vger.kernel.org
          Reporter: t.darcin10@gmail.com
        Regression: No

Regression report:

Intel 8265 Bluetooth (8087:0a2b) BLE connectivity regression observed after
kernel upgrade.

Environment:
- Debian 13 (trixie)
- Kernel: 6.12.86+deb13-amd64
- Previous working kernel: 6.1 (Debian 12)
- Bluetooth driver: btusb
- Device: Intel Dual Band Wireless-AC 8265

Problem:
BLE hearing aid device becomes unusable at normal distance (~0.5–1m).
Device only works when placed directly on top of the computer.

Classic Bluetooth devices (mouse, keyboard, phone audio) work normally.

This indicates BLE-specific regression rather than general Bluetooth failure.

Kernel logs:
----------------
iwlwifi 0000:3a:00.0: missed beacons exceeds threshold, but receiving data
Bluetooth: hci0: HCI LE Coded PHY feature bit is set, but its usage is not
supported
----------------

Observations:
- Wi-Fi and Bluetooth share Intel 8265 module
- Wi-Fi shows occasional missed beacon warnings
- Bluetooth firmware loads correctly
- No general HCI failure or device reset observed
- Issue is reproducible and consistent

Expected behavior:
BLE devices (hearing aid) should operate normally as in kernel 6.1.

Actual behavior:
Severe BLE range degradation only affecting hearing aid device.

Reproducibility:
100%

Regression:
Yes (worked on kernel 6.1, broken on 6.12)

Likely affected area:
btusb / Intel Bluetooth LE / PHY handling in kernel 6.12

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