ACK: [SRU][R][PATCH 0/1] Bluetooth does not work on MediaTek MT7920 because its firmware is not packaged

[Edoardo Canepa]

Acked-by: Edoardo Canepa <edoardo.canepa at canonical.com>

On 9/10/26 10:49, Ivan Hu via kernel-team wrote:
> BugLink: https://bugs.launchpad.net/bugs/2166944
>
> [Impact]
>
> Bluetooth does not work with a MediaTek MT7920 Wi-Fi/Bluetooth running on Ubuntu Core 26.
> The driver asks for a firmware file that is not on the image:
> bluetooth hci0: Direct firmware load for mediatek/BT_RAM_CODE_MT7961_1a_2_hdr.bin failed with error -2
> Bluetooth: hci0: Failed to load firmware file (-2)
> Bluetooth: hci0: Failed to set up firmware (-2)
>
> Classic Ubuntu images are not affected. They install the whole linux-firmware
> package, so the file is always on disk. The pc-kernel snap only ships firmware
> that modules declare with MODULE_FIRMWARE(), so the file is dropped there.
>
> [Fix]
>
> btmtk builds the MT7920 firmware name at runtime in btmtk_fw_get_filename() and
> never declares it. The patch adds a MODULE_FIRMWARE() entry for it, so tools
> that pick firmware from module metadata (modinfo -F firmware) keep the file.
>
> Upstream commit in bluetooth-next:
> Bluetooth: btmtk: Declare MT7920 (MT7961 1a) Bluetooth firmware
>
> [Test Plan]
>
> The patch only adds a firmware name to module metadata, so the check is on the
> btmtk module.
>
> Install the kernel from -proposed, reboot, then run:
>
> $ modinfo -F firmware btmtk | grep BT_RAM_CODE_MT7961_1a_2
>
> Without patch: no output
> With patch: mediatek/BT_RAM_CODE_MT7961_1a_2_hdr.bin
>
> [Where problems could occur]
> The patch only adds a firmware name to module metadata. It does not change any
> code path.
>
> Ivan Hu (1):
>    Bluetooth: btmtk: Declare MT7920 (MT7961 1a) Bluetooth firmware
>
>   drivers/bluetooth/btmtk.c | 1 +
>   drivers/bluetooth/btmtk.h | 1 +
>   2 files changed, 2 insertions(+)
>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: OpenPGP_signature.asc
Type: application/pgp-signature
Size: 840 bytes
Desc: OpenPGP digital signature
URL: <https://lists.ubuntu.com/archives/kernel-team/attachments/20260914/83d650db/attachment.sig>