[Bug 221426] New: Intel AX211 Bluetooth hci0 hardware error 0x0c with HID/HOG failures on 6.19.14-zen

[bugzilla-daemon@kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=221426

            Bug ID: 221426
           Summary: Intel AX211 Bluetooth hci0 hardware error 0x0c with
                    HID/HOG failures on 6.19.14-zen
           Product: Drivers
           Version: 2.5
          Hardware: All
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P3
         Component: Bluetooth
          Assignee: linux-bluetooth@vger.kernel.org
          Reporter: cristi@ieee.org
        Regression: No

Created attachment 309973
  --> https://bugzilla.kernel.org/attachment.cgi?id=309973&action=edit
Log highlights

# AX211 Bluetooth HID instability report

## Summary
Intel AX211 Bluetooth on this system intermittently fails with kernel hardware
error 0x0c and repeated BlueZ HOG profile failures. User-facing symptom is that
BLE mouse and keyboard become difficult or impossible to connect while Chrome
is open; closing Chrome often allows reconnect.

This appears to be a kernel or controller stability problem, potentially
amplified by power management settings and high USB activity.

## Environment
- Distro: ArchLinux rolling
- Kernel: 6.19.14-zen1-1-zen
- Bluetooth controller: Intel AX211 Bluetooth (USB ID 8087:0033)
- Devices affected: Logitech M720 mouse, Logitech K850 keyboard (BLE HID)

## Reproduction
1. Boot system normally.
2. Ensure Bluetooth service is active.
3. Open Chrome and use system normally.
4. Attempt to connect or keep connected BLE keyboard and mouse.
5. Observe failures, reconnect loops, or failed writes.
6. Close Chrome and retry; connection usually succeeds.

## Expected behavior
BLE mouse and keyboard should remain stable regardless of Chrome state.

## Actual behavior
BLE HID profile operation intermittently fails; reconnect loops occur and
controller errors are logged.

## High signal evidence
From kernel log:

    Bluetooth: hci0: Hardware error 0x0c
    Bluetooth: hci0: Retrieving Intel exception info failed (-16)

From bluetooth service log:

    profiles/input/hog-lib.c:output_written_cb() Write output report failed:
Request attribute has encountered an unlikely error
    Wrong size of start discovery return parameters

Power-management related state on this host:

    /sys/module/btusb/parameters/enable_autosuspend=Y
    /sys/module/usbcore/parameters/autosuspend=2

## Attachments
- System snapshot: ax211-bt-system-2026-04-27.txt
- Log highlights: ax211-bt-logs-2026-04-27.txt

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