No audio output on Havit Fuxi-H3 headset after upgrading to Kernel 7.2+

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Problem Description

After upgrading to Kernel 7.2.x, the Havit Fuxi-H3 wireless headset (using the 2.4GHz USB dongle) stopped emitting sound output on Fedora.

  • Hardware: Havit Fuxi-H3 Wireless

  • USB Dongle ID: 040b:0897 (Weltrend Semiconductor / XiiSound Technology Corporation)

  • Status: Microphone (capture) works fine, but playback is completely silent.

Root Cause

Inspecting dmesg and amixer reveals that Kernel 7.2 introduced a regression in how snd-usb-audio parses the USB Feature Units for this chipset.

Instead of a single channel control, ALSA creates two separate PCM playback controls:

  • numid=9 (index=0): Initialized at 100%

  • numid=10 (index=1): Initialized at 0% (muted at the hardware level)

Because the dongle’s DAC requires both virtual registers to be open, numid=10 sitting at 0 completely blocks audio output to the headset speakers.

Immediate Fix (CLI)

You can unblock the hardware playback channel immediately without restarting PipeWire or rebooting:

Bash

amixer -c FuxiH3 cset numid=10 100

Permanent Solution (Udev Rule)

To make this fix persistent across reboots and USB dongle reconnects, you can set up a custom udev rule.

  1. Create a udev rule file /etc/udev/rules.d/99-havit-fuxi-fix.rules:

Plaintext

ACTION=="add", SUBSYSTEM=="sound", ATTRS{idVendor}=="040b", ATTRS{idProduct}=="0897", RUN+="/usr/bin/amixer -c FuxiH3 cset numid=10 100"
  1. Reload the udev rules:

Bash

sudo udevadm control --reload-rules && sudo udevadm trigger

Automated Script & GitHub Repository

I created a small repository with automated install.sh and uninstall.sh scripts, along with technical documentation regarding this kernel regression:

GitHub Repository: rnra57/Fuxi-h3-sem-udio-no-Kernel-7.2

Hope this helps anyone experiencing silent audio output with this dongle on Fedora!

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