[Bug 220703] New: Bluetooth connection is sporadic, quality is poor - halts and stammers with linux-firmware-network-20250917_1

[Bug 220703] New: Bluetooth connection is sporadic, quality is poor - halts and stammers with linux-firmware-network-20250917_1

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=220703

            Bug ID: 220703
           Summary: Bluetooth connection is sporadic, quality is poor -
                    halts and stammers with
                    linux-firmware-network-20250917_1
           Product: Drivers
           Version: 2.5
          Hardware: All
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P3
         Component: Bluetooth
          Assignee: linux-bluetooth@vger.kernel.org
          Reporter: bob.hepple@gmail.com
        Regression: No

Laptop is a Dell Latitude 3120 probably manufactured in 2021. 

OS is voidlinux/x86_64/glibc:

Linux dosa 6.12.54_1 #1 SMP PREEMPT_DYNAMIC Mon Oct 20 18:07:19 UTC 2025 x86_64
GNU/Linux

Bluetooth Chip is an Intel AX201, lsusb gives:

Bus 001 Device 005: ID 8087:0026 Intel Corp. AX201 Bluetooth

I found that booting an old Mint USB stick worked fine so I thought to try an
older version of the firmware:

From dmesg I found that the firmware is /lib/firmware/intel/ibt-19-0-0.sfi and
ibt-0040-0041.ddc

The Mint 8 version of the firmware is 249-27.23

The VoidLinux version is 193-33.24 (ie 2024 and newer)

Get the 2023 firmware files:

cd /tmp 
wget
https://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git/plain/intel/ibt-19-0-0.sfi?h=20231030
-O ibt-19-0-0.sfi.20231030.249-27.23 
wget
https://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git/plain/intel/ibt-0040-0041.ddc?h=20231030
-O ibt-0040-0041.ddc.20231030.249-27.23 
sudo cp /lib/firmware/intel/ibt-19-0-0.sfi
/lib/firmware/intel/ibt-19-0-0.sfi.193-33.24 
sudo cp /lib/firmware/intel/ibt-0040-0041.ddc
/lib/firmware/intel/ibt-0040-0041.ddc.193-33.24 
sudo cp ibt-19-0-0.sfi.20231030.249-27.23 /lib/firmware/intel/ibt-19-0-0.sfi 
sudo cp ibt-0040-0041.ddc.20231030.249-27.23
/lib/firmware/intel/ibt-0040-0041.ddc 
sudo reboot 

bluetooth (& wifi) work perfectly with the older firmware - does the driver
need an update to catch up with the newer firmware?

Also posted here: https://github.com/void-linux/void-packages/issues/57670

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[Bug 220703] Bluetooth connection is sporadic, quality is poor - halts and stammers with linux-firmware-network-20250917_1

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=220703

--- Comment #1 from Bob Hepple (bob.hepple@gmail.com) ---
Firmware version is linux-firmware-network-20250917

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