Public bug reported:
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.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/2142536
Title:
Firmware Gap for MediaTek MT7902 and AMD GPU on Ubuntu 24.04 (Noble)
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