Bluetooth Earbuds Mic Buzzing / Corrupted SCO Audio on CachyOS (Works Fine on Debian) System Information Distribution with issue: CachyOS Distribution working correctly: Debian Desktop Environment: KDE Plasma Bluetooth Adapter: Qualcomm Atheros 0cf3:e009 Qualcomm Atheros Communications Kernel Driver: btusb Earbuds: CMF Buds 2 Plus Problem Summary The Bluetooth microphone of CMF Buds 2 Plus works correctly on Debian , but on CachyOS the microphone becomes: buzzing robotic / distorted electric noise poor/unusable for calls Music playback works normally on CachyOS in A2DP mode. Very Important Comparison Same laptop + same Bluetooth adapter + same earbuds: Debian: Bluetooth mic works fine CachyOS: Bluetooth mic broken in headset mode This strongly suggests the issue is software-related on CachyOS (kernel / PipeWire / BlueZ / config), not hardware failure. Reproduction Steps on CachyOS Connect CMF Buds 2 Plus. Select headset profile: Headset Head Unit (HSP/HFP, codec MSBC) or Headset Head Unit (HSP/HFP, codec CVSD) Test microphone in browser / voice recorder / call app. Actual Result on CachyOS Buzzing mic audio Distorted / robotic voice MSBC unstable HFP unusable Expected Result Should behave like Debian on same hardware, where microphone works correctly. Working Profiles on CachyOS Playback works in: High Fidelity Playback (A2DP Sink, codec SBC) High Fidelity Playback (A2DP Sink, codec SBC-XQ) High Fidelity Playback (A2DP Sink, codec AAC) Logs Seen on CachyOS Bluetooth: hci0: corrupted SCO packet Bluetooth: hci0: SCO packet for unknown connection handle Unable to get Hands-Free Voice gateway SDP record: Connection timed out a2dp-sink profile connect failed ... Device or resource busy RFCOMM receive command before SLC completed Checks Done lsusb Shows: 0cf3:e009 Qualcomm Atheros Communications lsusb -t Shows adapter using: Driver=btusb Troubleshooting Already Tried Full update ( sudo pacman -Syu ) Restart bluetooth service Restart PipeWire / WirePlumber Re-pair earbuds Switch all profiles Test CVSD / MSBC Reduce interference Suspected Cause Since Debian works fine and CachyOS fails on same hardware, likely one of: Kernel regression / CachyOS kernel config BlueZ version difference PipeWire / WirePlumber behavior Bluetooth stack patch difference SCO/HFP handling regression Request Please help compare CachyOS vs Debian Bluetooth audio stack or suggest packages/kernel/settings to make Bluetooth HFP mic behave like Debian on same hardware.