Public bug reported:
Hello,
I am experiencing a critical issue with the integrated Bluetooth chip on
the Raspberry Pi 5 running Ubuntu.
The system completely fails to output high-quality stereo audio (A2DP
profile) for ANY Bluetooth headset connected to it. When any headphone
is paired, the audio profile either gets stuck in low-quality Handsfree
(HFP/HSP) mode, or the A2DP profile fails to initialize completely,
resulting in constant stuttering or no sound at all.
Troubleshooting steps and findings:
1. This is NOT a device-specific issue. It happens with every single Bluetooth
headset/headphone tested.
2. The issue does NOT happen when using an external USB Bluetooth dongle on the
same Raspberry Pi 5. The external USB adapter works flawlessly in A2DP stereo
mode with all headsets.
3. The headsets work perfectly on other operating systems and devices.
This points to a general firmware/driver optimization issue between the
Broadcom integrated chip and the Ubuntu/PipeWire audio stack on the
ARM64 architecture for the Pi 5.
Logs and system info have been attached automatically by the ubuntu-bug
tool.
Thank you.
ProblemType: Bug
DistroRelease: Ubuntu 24.04
Package: bluez 5.72-0ubuntu5.5
ProcVersionSignature: Ubuntu 6.8.0-1057.61-raspi 6.8.12
Uname: Linux 6.8.0-1057-raspi aarch64
ApportVersion: 2.28.1-0ubuntu3.8
Architecture: arm64
CasperMD5CheckResult: unknown
CloudArchitecture: aarch64
CloudID: nocloud
CloudName: unknown
CloudPlatform: nocloud
CloudSubPlatform: config-disk (/dev/nvme0n1p1)
CurrentDesktop: ubuntu:GNOME
Date: Mon Jun 1 18:03:45 2026
InterestingModules: rfcomm bnep btusb bluetooth
Lspci-vt:
-[0000:00]---00.0-[01]----00.0 Realtek Semiconductor Co., Ltd. RTS5765DL NVMe
SSD Controller (DRAM-less)
-[0001:00]---00.0-[01]----00.0 Raspberry Pi Ltd RP1 PCIe 2.0 South Bridge
ProcKernelCmdLine: reboot=w coherent_pool=1M 8250.nr_uarts=1 pci=pcie_bus_safe
smsc95xx.macaddr=88:A2:9E:74:3D:D9 vc_mem.mem_base=0x3fc00000
vc_mem.mem_size=0x40000000 zswap.enabled=1 zswap.zpool=z3fold
zswap.compressor=zstd multipath=off dwc_otg.lpm_enable=0 console=tty1
root=LABEL=writable rootfstype=ext4 rootwait fixrtc quiet splash
SourcePackage: bluez
UpgradeStatus: No upgrade log present (probably fresh install)
acpidump:
hciconfig:
hci0: Type: Primary Bus: USB
BD Address: F4:4E:FC:9F:FF:7D ACL MTU: 679:6 SCO MTU: 240:20
UP RUNNING
RX bytes:60287 acl:53 sco:2085 events:187 errors:0
TX bytes:53145 acl:62 sco:1735 commands:110 errors:0
mtime.conffile..etc.bluetooth.main.conf: 2026-06-01T15:59:15.760298
** Affects: bluez (Ubuntu)
Importance: Undecided
Status: New
** Tags: apport-bug arm64 noble wayland-session
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https://bugs.launchpad.net/bugs/2154766
Title:
Integrated Bluetooth chip on Raspberry Pi 5 fails to output audio
(A2DP) for any headset
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