[Bug 2142536] Re: Firmware Gap for MediaTek MT7902 and AMD GPU on Ubuntu 24.04 (Noble)

** Tags added: kernel-daily-bug

--
You received this bug notification because you are subscribed to linux
in Ubuntu.
Matching subscriptions: Bgg, Bmail, Nb
https://bugs.launchpad.net/bugs/2142536

Title:
Firmware Gap for MediaTek MT7902 and AMD GPU on Ubuntu 24.04 (Noble)

Status in linux package in Ubuntu:
New

Bug description:
I am reporting a specific "deadlock" failure chain encountered on a
new laptop (ID 14c3:7902) running Ubuntu 24.04. The default
installation lacks the necessary firmware blobs for the MediaTek
MT7902 Wi-Fi card and the integrated AMD GPU, leading to a system
state that prevents standard recovery methods (like USB tethering).

The Failure Chain:

Missing Wi-Fi Firmware: The MT7902 card is not recognized, forcing the
user to attempt USB tethering for internet access.

GPU Firmware Interrupts: Concurrently, the missing AMD GPU firmware
triggers constant kernel interrupts (dm_irq_work_func hogged CPU),
utilizing 100% of a CPU core.

USB Timing Lag: This CPU hogging creates a micro-stutter on the USB
bus. When attempting to enable USB Tethering (e.g., via a Moto G 5G),
the handshake fails or times out because the system is too laggy to
respond within the required window.

Offline Deadlock: The user is left "air-gapped" with no way to
download the ~500MB linux-firmware package required to fix both
issues.

Solution Verified:
Manually sideloading the full 521MB linux-firmware archive (git3b128b60 or later) via USB and using dpkg-deb -x to extract the blobs directly to /lib/firmware, followed by a manual driver bind (echo "14c3 7902" > /sys/bus/pci/drivers/mt7921e/new_id), successfully restored Wi-Fi and resolved the GPU-induced CPU hogging.

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2142536/+subscriptions