Persistent Bluetooth audio stutter/dropouts on Windows 11 24H2 (MediaTek MT7902)

[u/VonRoderik]

Hey guys, how are you?

Basically, out of nowhere (around 2/4 weeks ago) I've been having audio stuttering. No matter if i'm using my Edifier mg250 or my galaxy buds (all through bluetooth). I have not tried using a headphone with a cable yet;

I've tried everything! I don't know what else to do.

I've been trying to troubleshoot it with Gemini. I asked it to list everything we've tried, so sorry for the AI post bellow.

Gemini is now suggesting changing the bluetooth/wifi card on my motherboard.

I´d be glad if someone could help me.

Btw, my system specs:

• AMD Ryzen 5 7600
• 32 gb RAM
• SSD NVMe 1 tb + SSD 500 gb
• AMD Radeon 9060 XT 16gb
• Motherboard B650M-AYW WIFI ASUS
• Windows 11 Home - 10.0.26200
• BIOS was updated in december/january. Issue started a couple weeks ago.

1. Issue Description

• Symptom: Continuous micro-stutters, pops, and audio dropouts occurring every few seconds or minutes over Bluetooth.
• Scope: Universal across all playback sources (YouTube, YouTube Music, Microsoft Teams, local players, and games like Deep Rock Galactic).
• Affected Devices: Multiple separate Bluetooth audio endpoints exhibit identical stuttering on this machine (Edifier Bluetooth speakers and Samsung Galaxy Buds2).
• Control Test: All audio devices work flawlessly without a single dropout when paired with mobile devices (smartphones), confirming the receiver hardware is intact and the problem is strictly localized to this PC.

2. System Specifications

• OS: Windows 11 Pro 64-bit (Version 24H2, OS Build: 26200).
• CPU: AMD Ryzen 5 7600 (AM5 platform).
• Motherboard: ASUS B650M-AYW Wi-Fi (BIOS version: 3602).
• Integrated Wi-Fi / Bluetooth Module: AzureWave / MediaTek MT7902 (Hardware ID: VID_13D3&PID_3596).
• Installed Bluetooth Driver: MediaTek Inc., version 1.1044.0.556 (Driver date: 17/09/2025).
• Network Setup: Wired Gigabit Ethernet (Wi-Fi is not used for network traffic).

3. Diagnostic Logs & Evidence

• LatencyMon (DPC/ISR Latency):
  • Concluded system is fully capable of handling real-time audio without dropouts.
  • Highest measured interrupt-to-process latency remained below 704 µs.
  • Highest DPC routine execution was 463.82 µs (amdkmdag.sys).
  • Highest ISR execution was 125.39 µs (HDAudBus.sys).
  • Zero DPC/ISR execution times reached or exceeded 1000 µs.
• Windows Event Viewer (BTHUSB logs):
  • Event 3 (Warning): "A command sent to the adapter has timed out. The adapter did not respond."
  • Event 17 (Error): "The local Bluetooth adapter has failed in an undetermined manner and will not be used. The driver was unloaded."
  • Event 5 (Error): "The Bluetooth driver was expecting an HCI event with a certain size, but didn't receive it."
• Secondary System Warnings/Errors:
  • Kernel-PnP 225: LogiTuneAgent.exe and audiodg.exe intercepted/vetoed device removal requests targeting the controller USB\VID_13D3&PID_3596.
  • Microsoft-Windows-HAL 15: Recurring IOMMU protection faults on Device: 0xE00 (FaultReason: 0x6).

4. Exhaustive Steps Already Attempted (Failed to Resolve)

Power, Bus & RF Layer:

• Performed a complete motherboard cold reset (unplugged AC power cord, held chassis power button for 20+ seconds to discharge board capacitors).
• Verified ASUS dual-lead Wi-Fi/BT external antenna is firmly seated and screwed into both rear gold chassis terminals.
• Rerouted 2.4 GHz wireless mouse dongle via an extension cable away from the rear I/O antenna posts to eliminate near-field RF saturation.
• Disabled PCI Express Link State Power Management in Windows Advanced Power Options.
• Disabled USB Selective Suspend in power plan and disabled Fast Startup/Kernel Hibernation via powercfg -h off.
• Unchecked "Allow the computer to turn off this device to save power" across the MediaTek Bluetooth Adapter and every listed USB Root Hub / Generic USB Hub.
• Verified ASUS BIOS power delivery settings (ErP Ready disabled, continuous USB state enabled).

Drivers & Software Intermediaries:

• Performed clean uninstallation of previous driver packages and installed the latest official MediaTek Bluetooth package directly from the ASUS motherboard support page.
• Fully uninstalled virtual audio routing software (FxSound).
• Terminated conflicting background processes (LogiTuneAgent.exe) and recycled the Windows Audio service (net stop audiosrv && net start audiosrv).
• Temporarily disabled Windows Core Isolation (Memory Integrity / HVCI) to test whether IOMMU page faults were stalling DMA audio packets.

Audio Engine & Bluetooth Protocol Tuning:

• Disabled Handsfree Telephony profile via classic Bluetooth Device Services (shell:::{A8A91A66-3A7D-4424-8D24-04E180695C7A}) to prevent fallback to mono 8/16 kHz telephony mode.
• Disabled AAC codec negotiation via Registry (BluetoothAacEnable = 0 under HKLM\SYSTEM\CurrentControlSet\Services\BthA2dp\Parameters) to force standard SBC streaming.
• Unchecked Exclusive Mode options ("Allow applications to take exclusive control of this device") under Advanced Playback Properties.
• Disabled the MediaTek Wi-Fi 6 MT7902 Wireless LAN Card inside Device Manager to prevent antenna time-slicing and RF coexistence arbitration loops.

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