[Bug 220344] New: Intel AX211 bluetooth randomly disconnects and reconnects, started after kernel update

[bugzilla-daemon@kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=220344

            Bug ID: 220344
           Summary: Intel AX211 bluetooth randomly disconnects and
                    reconnects, started after kernel update
           Product: Drivers
           Version: 2.5
          Hardware: Intel
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P3
         Component: Bluetooth
          Assignee: linux-bluetooth@vger.kernel.org
          Reporter: tal.lich@gmail.com
        Regression: No

Bluetooth devices disconnect every few minutes. Tried same devices with another
laptop with same hardware but Windows OS - works fine. So this is not the
devices or the Bluetooth hardware.

Every time the disconnect happens, dmesg shows:

Jul 16 13:47:24 licht-t14s kernel: Bluetooth: hci0: Retrieving Intel exception
info failed (-16)
Jul 16 13:47:24 licht-t14s kernel: Bluetooth: hci0: Hardware error 0x0c

I have tried:
- Downloading the newest firmware file from linux-firmware (file
ibt-0040-0041.{sfi/ddc}

- Setting the following options in /etc/modprobe.d

# Disable power saving in both iwlmvm and iwlwifi
options iwlmvm power_scheme=1
options iwlwifi power_save=0

# Disable bluetooth coexistence to avoid BT issues
options iwlwifi bt_coex_active=0

I have read on Ubuntu's forum (here:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2051720) that this may be
a regression in kernel 6.5 but I'm on a newer kernel

Hardware info:
System  : Lenovo Thinkpad T14s Gen4 model 21F60051IV
BIOS    : N3PET23W (1.14)
Adapter : Intel AX211
Firmware: 133-20.25

OS info:
Kernel  : Linux licht-t14s 6.8.0-60-generic #63~22.04.1-Ubuntu SMP
PREEMPT_DYNAMIC Tue Apr 22 19:00:15 UTC 2 x86_64 x86_64 x86_64 GNU/Linux
Distro  : Ubuntu 22.04.05

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