# Description: After upgrading linux-firmware from 20251021-1.fc43 to 20260221-1.fc43 (installed March 6, 2026), the Bluetooth function of a MediaTek MT7921K (RZ608) combo WiFi/BT card has completely stopped enumerating on the internal USB bus. # Hardware: - MediaTek MT7921K (RZ608) Wi-Fi 6E / BT 5.2 combo card - PCI address: 0000:0d:00.0 - ASIC revision: 79610010 # Testing performed: - Tested on kernel 6.18.16-200.fc43.x86_64 and 6.18.13-200.fc43.x86_64 -- same result on both - Bluetooth enabled in UEFI/BIOS -- verified - PCIe FLR reset attempted -- no effect - BT firmware blobs present in /lib/firmware/mediatek/ (BT_RAM_CODE_MT7961_1_2_hdr.bin.xz, BT_RAM_CODE_MT7961_1a_2_hdr.bin.xz) - Not yet tested with downgrade to linux-firmware-20251021-1.fc43 Reproducible: Always Steps to Reproduce: 1. System running linux-firmware-20251021-1.fc43 -- Bluetooth works (historical, confirmed working ~1 month ago) 2. Upgrade to linux-firmware-20260221-1.fc43 3. Bluetooth USB device no longer enumerates on any kernel Actual Results: - WiFi works normally over PCIe (mt7921e driver loads, firmware version 20251223091050a) - Bluetooth USB device does not appear in lsusb or lsusb -t - No Bluetooth-related messages in dmesg at all - btusb module never loads (no USB device to bind to) - rfkill list shows no Bluetooth device - PCIe function level reset does not re-enumerate the BT USB endpoint Expected Results: - MediaTek Bluetooth USB device (vendor 0e8d) should appear on the internal USB bus - btusb should load and Bluetooth should function Additional Information: # System info: - Fedora 43 - fwupd 2.0.20 - Kernels tested: 6.18.13-200.fc43, 6.18.16-200.fc43
FEDORA-2026-445b31d485 (linux-firmware-20260410-1.fc44) has been submitted as an update to Fedora 44. https://bodhi.fedoraproject.org/updates/FEDORA-2026-445b31d485
FEDORA-2026-5d86317e79 (linux-firmware-20260410-1.fc42) has been submitted as an update to Fedora 42. https://bodhi.fedoraproject.org/updates/FEDORA-2026-5d86317e79
FEDORA-2026-f0f802a460 (linux-firmware-20260410-1.fc43) has been submitted as an update to Fedora 43. https://bodhi.fedoraproject.org/updates/FEDORA-2026-f0f802a460
FEDORA-2026-445b31d485 has been pushed to the Fedora 44 testing repository. Soon you'll be able to install the update with the following command: `sudo dnf upgrade --enablerepo=updates-testing --refresh --advisory=FEDORA-2026-445b31d485` You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-445b31d485 See also https://fedoraproject.org/wiki/QA:Updates_Testing for more information on how to test updates.
FEDORA-2026-f0f802a460 has been pushed to the Fedora 43 testing repository. Soon you'll be able to install the update with the following command: `sudo dnf upgrade --enablerepo=updates-testing --refresh --advisory=FEDORA-2026-f0f802a460` You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-f0f802a460 See also https://fedoraproject.org/wiki/QA:Updates_Testing for more information on how to test updates.
FEDORA-2026-5d86317e79 has been pushed to the Fedora 42 testing repository. Soon you'll be able to install the update with the following command: `sudo dnf upgrade --enablerepo=updates-testing --refresh --advisory=FEDORA-2026-5d86317e79` You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-5d86317e79 See also https://fedoraproject.org/wiki/QA:Updates_Testing for more information on how to test updates.
FEDORA-2026-5d86317e79 (linux-firmware-20260410-1.fc42) has been pushed to the Fedora 42 stable repository. If problem still persists, please make note of it in this bug report.
FEDORA-2026-f0f802a460 (linux-firmware-20260410-1.fc43) has been pushed to the Fedora 43 stable repository. If problem still persists, please make note of it in this bug report.
FEDORA-2026-445b31d485 (linux-firmware-20260410-1.fc44) has been pushed to the Fedora 44 stable repository. If problem still persists, please make note of it in this bug report.