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Bji_bji

Member

Registered: 2025-07-11

Posts: 6

No Sound from BT Amplifier After Update (Fosi Audio BT20A, Pipewire)

After a recent system update, my Bluetooth amplifier (Fosi Audio BT20A) connects successfully, but no audio is heard, despite everything appearing to work.

What I’ve tried:
- Verified a2dp-sink and a2dp-sink-sbc_xq profiles (both connect cleanly via pactl)
- Audio stream is routed correctly (sink is RUNNING)
- Used pavucontrol and paplay to test routing
- Restarted PipeWire/WirePlumber/Bluetooth services
- No errors in logs, only a benign a2dp-source profile connect failed (expected)
- Galaxy Buds FE output works as expected on the same system
- Amplifier used to work before the upgrade

 ~ uname -a
Linux b-laptop 6.15.6-arch1-1 #1 SMP PREEMPT_DYNAMIC Thu, 10 Jul 2025 17:10:18 +0000 x86_64 GNU/Linux

 ~ pactl list short cards
51	alsa_card.pci-0000_00_1f.3-platform-skl_hda_dsp_generic	alsa
160	bluez_card.F4_4E_FD_6F_68_73	module-bluez5-device.c  
366	bluez_card.BC_A0_80_FB_1A_CE	module-bluez5-device.c

#### bluez_card.F4_4E_FD_6F_68_73	module-bluez5-device.c   - this is the bluetooth amp #### 

 ~ pactl list cards | grep -A20 F4_4E_FD_6F_68_73
	Name: bluez_card.F4_4E_FD_6F_68_73
	Driver: module-bluez5-device.c
	Owner Module: n/a
	Properties:
		api.bluez5.address = "F4:4E:FD:6F:68:73"
		api.bluez5.class = "0x240404"
		api.bluez5.connection = "connected"
		api.bluez5.device = ""
		api.bluez5.icon = "audio-headset"
		api.bluez5.path = "/org/bluez/hci0/dev_F4_4E_FD_6F_68_73"
		bluez5.profile = "off"
		device.alias = "Fosi Audio BT20A"
		device.api = "bluez5"
		device.bus = "bluetooth"
		device.description = "Fosi Audio BT20A"
		device.form_factor = "headset"
		device.icon_name = "audio-headset-bluetooth"
		device.name = "bluez_card.F4_4E_FD_6F_68_73"
		device.product.id = "0xb009"
		device.string = "F4:4E:FD:6F:68:73"
		device.vendor.id = "usb:10d6"
		media.class = "Audio/Device"
		spa.object.id = "4"
		factory.id = "15"
		client.id = "46"
		object.id = "152"
		object.serial = "160"
	Profiles:
		off: Off (sinks: 0, sources: 0, priority: 0, available: yes)
		a2dp-sink: High Fidelity Playback (A2DP Sink, codec SBC) (sinks: 1, sources: 0, priority: 18, available: yes)
		a2dp-sink-sbc_xq: High Fidelity Playback (A2DP Sink, codec SBC-XQ) (sinks: 1, sources: 0, priority: 17, available: yes)
	Active Profile: a2dp-sink
	Ports:
		headset-output: Headset (type: Headset, priority: 0, latency offset: 0 usec, available)
			Properties:
				port.type = "headset"
			Part of profile(s): a2dp-sink, a2dp-sink-sbc_xq

 ~ pactl list short sinks

59	alsa_output.pci-0000_00_1f.3-platform-skl_hda_dsp_generic.pro-output-0	PipeWire	s32le 2ch 48000Hz	IDLE
60	alsa_output.pci-0000_00_1f.3-platform-skl_hda_dsp_generic.pro-output-3	PipeWire	s24-32le 2ch 48000Hz	IDLE
61	alsa_output.pci-0000_00_1f.3-platform-skl_hda_dsp_generic.pro-output-4	PipeWire	s24-32le 2ch 48000Hz	IDLE
62	alsa_output.pci-0000_00_1f.3-platform-skl_hda_dsp_generic.pro-output-5	PipeWire	s24-32le 2ch 48000Hz	IDLE
63	alsa_output.pci-0000_00_1f.3-platform-skl_hda_dsp_generic.pro-output-31	PipeWire	s32le 2ch 48000Hz	IDLE
161	bluez_output.F4_4E_FD_6F_68_73.1	PipeWire	s16le 2ch 48000Hz	RUNNING
368	bluez_output.BC_A0_80_FB_1A_CE.1	PipeWire	s16le 2ch 48000Hz	IDLE

If I play any sound and choose the Fost Audio bluetooth device, I see the sound bar in pavucontrol go up and down but no sound. If I select my Galaxy Buds bluetooth headset, everything works perfect.

I have also cleared the pipewire local state

rm -r ~/.local/state/pipewire

and

➜  ~ fuser --all --verbose /dev/snd/*
                     USER        PID ACCESS COMMAND
/dev/snd/by-path:
/dev/snd/controlC0:  basrw3    10560 F.... wireplumber
/dev/snd/hwC0D0:
/dev/snd/hwC0D2:
/dev/snd/pcmC0D0c:   basrw3    10067 F...m pipewire
/dev/snd/pcmC0D0p:   basrw3    10067 F...m pipewire
/dev/snd/pcmC0D31p:  basrw3    10067 F...m pipewire
/dev/snd/pcmC0D3p:   basrw3    10067 F...m pipewire
/dev/snd/pcmC0D4p:   basrw3    10067 F...m pipewire
/dev/snd/pcmC0D5p:   basrw3    10067 F...m pipewire
/dev/snd/pcmC0D6c:   basrw3    10067 F...m pipewire
/dev/snd/pcmC0D7c:   basrw3    10067 F...m pipewire
/dev/snd/seq:        basrw3    10067 F.... pipewire
/dev/snd/timer:

Appreciate any help.

gromit

Administrator

From: Germany

Registered: 2024-02-10

Posts: 1,525

Website

Re: No Sound from BT Amplifier After Update (Fosi Audio BT20A, Pipewire)

What did get updated in the transaction? Please post the relevant log snippet from pacman.log!

Bji_bji

Member

Registered: 2025-07-11

Posts: 6

Re: No Sound from BT Amplifier After Update (Fosi Audio BT20A, Pipewire)

thanks for taking a look. these are the relevant log entries -

[2025-07-10T11:54:00-0400] [ALPM] upgraded libpipewire (1:1.2.7-1 -> 1:1.4.6-1)
[2025-07-10T11:54:00-0400] [ALPM] upgraded pipewire (1:1.2.7-1 -> 1:1.4.6-1)
[2025-07-10T11:54:00-0400] [ALPM] upgraded alsa-card-profiles (1:1.2.7-1 -> 1:1.4.6-1)
[2025-07-10T11:54:00-0400] [ALPM] upgraded bluez-libs (5.79-1 -> 5.83-1)
[2025-07-10T11:54:00-0400] [ALPM] upgraded libfreeaptx (0.1.1-2 -> 0.2.2-1)
[2025-07-10T11:54:00-0400] [ALPM] upgraded webrtc-audio-processing-1 (1.3-4 -> 1.3-5)
[2025-07-10T11:54:00-0400] [ALPM] upgraded pipewire-audio (1:1.2.7-1 -> 1:1.4.6-1)
[2025-07-10T11:54:00-0400] [ALPM] upgraded libwireplumber (0.5.8-1 -> 0.5.10-1)
[2025-07-10T11:54:00-0400] [ALPM] upgraded lua (5.4.7-1 -> 5.4.8-2)
[2025-07-10T11:54:00-0400] [ALPM] upgraded wireplumber (0.5.8-1 -> 0.5.10-1)
[2025-07-10T11:54:00-0400] [ALPM] upgraded pipewire-jack (1:1.2.7-1 -> 1:1.4.6-1)
[2025-07-10T11:54:09-0400] [ALPM] upgraded bluez (5.79-1 -> 5.83-1)
[2025-07-10T11:54:09-0400] [ALPM] upgraded bluez-qt (6.11.0-1 -> 6.15.0-1)
[2025-07-10T11:54:09-0400] [ALPM] upgraded bluedevil (1:6.3.2-1 -> 1:6.4.2-1)
[2025-07-10T11:54:09-0400] [ALPM] upgraded bluez-utils (5.79-1 -> 5.83-1)

Last edited by Bji_bji (2025-07-11 11:28:36)

gromit

Administrator

From: Germany

Registered: 2024-02-10

Posts: 1,525

Website

Re: No Sound from BT Amplifier After Update (Fosi Audio BT20A, Pipewire)

Did the linux kernel and linux-firmware also get updated?

Bji_bji

Member

Registered: 2025-07-11

Posts: 6

Re: No Sound from BT Amplifier After Update (Fosi Audio BT20A, Pipewire)

yes, sorry for omitting those -

[2025-07-10T11:53:49-0400] [ALPM] upgraded linux-firmware-whence (20250210.5bc5868b-1 -> 20250627-1)
[2025-07-10T11:53:49-0400] [ALPM] installed linux-firmware-amdgpu (20250627-1)
[2025-07-10T11:53:49-0400] [ALPM] installed linux-firmware-atheros (20250627-1)
[2025-07-10T11:53:49-0400] [ALPM] installed linux-firmware-broadcom (20250627-1)
[2025-07-10T11:53:49-0400] [ALPM] installed linux-firmware-cirrus (20250627-1)
[2025-07-10T11:53:50-0400] [ALPM] installed linux-firmware-intel (20250627-1)
[2025-07-10T11:53:50-0400] [ALPM] installed linux-firmware-mediatek (20250627-1)
[2025-07-10T11:53:50-0400] [ALPM] installed linux-firmware-nvidia (20250627-1)
[2025-07-10T11:53:50-0400] [ALPM] installed linux-firmware-other (20250627-1)
[2025-07-10T11:53:50-0400] [ALPM] installed linux-firmware-radeon (20250627-1)
[2025-07-10T11:53:50-0400] [ALPM] installed linux-firmware-realtek (20250627-1)
[2025-07-10T11:53:50-0400] [ALPM] installed linux-firmware (20250627-1)
[2025-07-10T11:53:50-0400] [ALPM] upgraded linux-api-headers (6.13-1 -> 6.15-1)

[2025-07-10T11:54:26-0400] [ALPM] upgraded linux (6.13.4.arch1-1 -> 6.15.5.arch1-1)
[2025-07-10T11:54:26-0400] [ALPM] upgraded pahole (1:1.29-1 -> 1:1.30-2)
[2025-07-10T11:54:27-0400] [ALPM] upgraded linux-headers (6.13.4.arch1-1 -> 6.15.5.arch1-1)

##these are the upgrades happened later in the day###
[2025-07-10T23:25:51-0400] [ALPM] upgraded linux (6.15.5.arch1-1 -> 6.15.6.arch1-1)
[2025-07-10T23:25:51-0400] [ALPM] upgraded linux-firmware-whence (20250627-1 -> 20250708-1)
[2025-07-10T23:25:51-0400] [ALPM] upgraded linux-firmware-amdgpu (20250627-1 -> 20250708-1)
[2025-07-10T23:25:51-0400] [ALPM] upgraded linux-firmware-atheros (20250627-1 -> 20250708-1)
[2025-07-10T23:25:51-0400] [ALPM] upgraded linux-firmware-broadcom (20250627-1 -> 20250708-1)
[2025-07-10T23:25:51-0400] [ALPM] upgraded linux-firmware-cirrus (20250627-1 -> 20250708-1)
[2025-07-10T23:25:51-0400] [ALPM] upgraded linux-firmware-intel (20250627-1 -> 20250708-1)
[2025-07-10T23:25:51-0400] [ALPM] upgraded linux-firmware-mediatek (20250627-1 -> 20250708-1)
[2025-07-10T23:25:51-0400] [ALPM] upgraded linux-firmware-nvidia (20250627-1 -> 20250708-1)
[2025-07-10T23:25:51-0400] [ALPM] upgraded linux-firmware-other (20250627-1 -> 20250708-1)
[2025-07-10T23:25:51-0400] [ALPM] upgraded linux-firmware-radeon (20250627-1 -> 20250708-1)
[2025-07-10T23:25:51-0400] [ALPM] upgraded linux-firmware-realtek (20250627-1 -> 20250708-1)
[2025-07-10T23:25:51-0400] [ALPM] upgraded linux-firmware (20250627-1 -> 20250708-1)
[2025-07-10T23:25:53-0400] [ALPM] upgraded linux-headers (6.15.5.arch1-1 -> 6.15.6.arch1-1)

Also if its relevant, the first time the upgrade failed due to the breaking change in the linux-firmware and I did remove it manually and started the upgrade again..

# pacman -Rdd linux-firmware
# pacman -Syu linux-firmware

Last edited by Bji_bji (2025-07-11 12:10:35)

gromit

Administrator

From: Germany

Registered: 2024-02-10

Posts: 1,525

Website

Re: No Sound from BT Amplifier After Update (Fosi Audio BT20A, Pipewire)

Is the issue resolved when you downgrade to a previous kernel again? I'm asking because of https://gitlab.archlinux.org/archlinux/ … issues/149

Bji_bji

Member

Registered: 2025-07-11

Posts: 6

Re: No Sound from BT Amplifier After Update (Fosi Audio BT20A, Pipewire)

Thanks. Let me try downgrading... My Bluetooth headphones works fine, it's only my Bluetooth amplifier having trouble. I'm not sure why would one not work with the same everything...

Bji_bji

Member

Registered: 2025-07-11

Posts: 6

Re: No Sound from BT Amplifier After Update (Fosi Audio BT20A, Pipewire)

yes, downgrading to linux 6.13.4.arch1-1 worked.. all the bluetooth devices are working properly..

gromit

Administrator

From: Germany

Registered: 2024-02-10

Posts: 1,525

Website

Re: No Sound from BT Amplifier After Update (Fosi Audio BT20A, Pipewire)

So lets maybe see if the solution for the issue mentioned above also fixes the issue for you.

Bji_bji

Member

Registered: 2025-07-11

Posts: 6

Re: No Sound from BT Amplifier After Update (Fosi Audio BT20A, Pipewire)

Thanks much for your help. I will keep watching the thread...

shineon82

Member

Registered: 2025-07-12

Posts: 1

Re: No Sound from BT Amplifier After Update (Fosi Audio BT20A, Pipewire)

I have the exact same issue with a Philips stereo: it connects, but there's no sound. However, it works fine when using headphones instead.

I followed the same steps and tests, everything looked fine on my end too. I also solved it by downgrading to linux-6.13.4.arch1-1.