XPost: linux.debian.bugs.dist   
   From: pampuski@duck.com   
      
   Source: linux   
   Version: 6.16.12+deb14+1-amd64   
   Severity: normal   
   X-Debbugs-Cc: pampuski@duck.com   
      
   Dear Maintainer,   
      
   *** Reporter, please consider answering these questions, where appropriate ***   
      
      * What led up to the situation?   
      * What exactly did you do (or not do) that was effective (or   
        ineffective)?   
      * What was the outcome of this action?   
      * What outcome did you expect instead?   
      
   *** End of the template - remove these template lines ***   
      
      
   -- System Information:   
   Debian Release: forky/sid   
     APT prefers testing   
     APT policy: (500, 'testing')   
   Architecture: amd64 (x86_64)   
   Foreign Architectures: i386   
      
   Kernel: Linux 6.16.12+deb14+1-amd64 (SMP w/24 CPU threads; PREEMPT)   
   Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8), LANGUAGE not   
   set   
   Shell: /bin/sh linked to /usr/bin/dash   
   Init: systemd (via /run/systemd/system)   
   LSM: AppArmor: enabled   
      
      
      
   Dear Maintainer,   
      
   I'm filing this because I have a serious, persistent bug with my Intel AX210   
   Bluetooth audio on Debian. The problem isn't configuration; it's a kernel   
   driver issue preventing high-quality audio streaming (A2DP).   
      
   The Bluetooth headset connects, but I get absolutely no sound.   
      
   1. Situation   
      
       System State: Stable on basic audio (now running PulseAudio), but the A2DP   
   profile fails immediately upon stream activation.   
      
       Ineffective (The Bug): I cannot get sound out of the headset. Manual   
   activation via pactl set-card-profile [card] a2dp_sink fails immediately with   
   an Input/Output error or No such entity, indicating a low-level driver failure   
   upon audio stream    
   creation.   
      
       Ineffective (The Scope): The issue persists across multiple current   
   distributions (Debian, openSUSE Tumbleweed), confirming it is a widespread bug   
   in the Kernel/BlueZ stack, not a simple Debian configuration issue.   
      
       Effective (The Clue): The exact same hardware/headset combination works   
   perfectly on Linux Mint, suggesting the specific patch needed to fix the A2DP   
   transport failure is missing from the current Debian kernel.   
      
   2. Evidence   
      
   A. Failure Mode (The Error):   
      
   When attempting to activate A2DP, the command fails:   
      
   pactl set-card-profile bluez_card.0C_AE_BD_DB_C9_85 a2dp_sink   
   Failure: Input/Output error   
      
   B. Kernel Driver Status (Proof drivers are loaded but failing):   
      
   $ sudo dmesg | grep -i 'alsa\|audio\|hda\|btusb'   
   [ 3.912133] usb 3-6: Product: USB Audio   
   [ 3.977366] hid-generic 0003:0B05:1A52.0007: hiddev3,hidraw6: USB HID v1.11   
   Device [Generic USB Audio] on usb-0000:12:00.0-6/input7   
   [ 8.877075] snd_hda_intel 0000:03:00.1: Force to non-snoop mode   
   [ 8.943353] snd_hda_intel 0000:03:00.1: bound 0000:03:00.0 (ops    
   mdgpu_dm_audio_component_bind_ops [amdgpu])   
   [ 8.945385] input: HDA ATI HDMI HDMI/DP,pcm=3 as /devices/pci000   
   :00/0000:00:01.1/0000:01:00.0/0000:02:00.0/0000:03:00.1/sound/card1/input15   
   [ 8.945437] input: HDA ATI HDMI HDMI/DP,pcm=7 as /devices/pci000   
   :00/0000:00:01.1/0000:01:00.0/0000:02:00.0/0000:03:00.1/sound/card1/input16   
   [ 8.945482] input: HDA ATI HDMI HDMI/DP,pcm=8 as /devices/pci000   
   :00/0000:00:01.1/0000:01:00.0/0000:02:00.0/0000:03:00.1/sound/card1/input17   
   [ 8.945530] input: HDA ATI HDMI HDMI/DP,pcm=9 as /devices/pci000   
   :00/0000:00:01.1/0000:01:00.0/0000:02:00.0/0000:03:00.1/sound/card1/input18   
   [ 8.945574] input: HDA ATI HDMI HDMI/DP,pcm=10 as /devices/pci00   
   0:00/0000:00:01.1/0000:01:00.0/0000:02:00.0/0000:03:00.1/sound/card1/input19   
   [ 8.951649] usbcore: registered new interface driver btusb   
   [ 14.878507] usbcore: registered new interface driver snd-usb-audio   
      
   C. Audio Sink Status (Proof A2DP is visible but silent):   
      
   $ actl list sinks short   
   ...   
   7       bluez_sink.F4_9D_8A_88_50_6F.a2dp_sink  module-bluez5-device.c  s16le   
   2ch 44100Hz       IDLE   
      
   (Note: The sink is loaded as A2DP but remains in the silent IDLE state.)   
      
   Thank you for your time in investigating this issue,   
      
   Bob   
      
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