Bluetooth

In Part 1, I documented getting MT7927 Bluetooth working through a DKMS package - patching three missing layers (USB device ID, hardware variant support, and firmware) into an out-of-tree build. That post ended with: As of February 2026, none of the three layers have reached mainline Linux. This post covers what happened next: submitting all three layers upstream and getting the BT driver patches merged after five revision cycles. Update (2026-03-31): The BT driver patches have been merged into bluetooth-next by Luiz Augusto von Dentz. They will ship in mainline Linux 7.1 or 7.2. ...

In November 2024, I installed an ASUS ROG Crosshair X870E Hero motherboard - AMD’s flagship X870E platform with a MediaTek MT7927 (Filogic 380) WiFi 7 chip. Running CachyOS, WiFi worked out of the box through the mt7925e driver. Bluetooth did not. What followed was a 15-month journey through kernel source, mailing lists, and community reverse-engineering that ended with a working Bluetooth 5.4 adapter and a published AUR package. This is the story of how it got there. ...