Public bug reported:
**Summary**
The speakers and headphone output do not work. GNOME and PipeWire only show
"Dummy Output". The sound card `sof-soundwire` is registered, but the kernel
finds no SoundWire machine driver for this laptop, so no speaker sink is
created.
**Hardware**
- HP OmniBook X Flip Laptop 14-kb0xxx, BIOS F.10, audio subsystem ID 103c:8ea4
- Intel Core Ultra Series 3 (Panther Lake) audio controller, 8086:e428
- Realtek RT712 (SoundWire link 3), 2x TI TAS2783 speaker amps (link 2)
**Versions**
- Ubuntu 26.10, linux 7.3.0-9-generic (#9-Ubuntu, Oct 5 2026)
- linux-firmware 20260915.git1522c78a.1ubuntu, firmware-sof-signed 2026.09-1
- alsa-ucm-conf 1.2.16.1-1ubuntu1, pipewire 1.6.8, wireplumber 0.5.17
**Steps**
1. Boot, open Settings > Sound.
2. Only "Dummy Output" is listed. `wpctl status` shows the same, and the card
profile list is off / HiFi (unavailable) / pro-audio.
**Expected:** speaker and headphone outputs.
**Key log lines**
```
sof-audio-pci-intel-ptl 0000:00:1f.3: No SoundWire machine driver found for the
ACPI-reported configuration:
sof-audio-pci-intel-ptl 0000:00:1f.3: link 2 mfg_id 0x0102 part_id 0x0000
version 0x3
sof-audio-pci-intel-ptl 0000:00:1f.3: link 3 mfg_id 0x025d part_id 0x0712
version 0x3
sof-audio-pci-intel-ptl 0000:00:1f.3: Use SoundWire default machine driver with
function topologies
slave-tas2783 sdw:0:2:0102:0000:01:c: Direct firmware load for 8EA4-2-0xC.bin
failed with error -2
slave-tas2783 sdw:0:2:0102:0000:01:9: Direct firmware load for 8EA4-2-0x9.bin
failed with error -2
```
Also `UBSAN: shift-out-of-bounds in sound/soc/sof/ipc4-topology.c:2471:13`.
**Findings**
- The TAS2783 driver requests `8EA4-2-0x{9,C}.bin`, but linux-firmware ships
`8EA4-0-2-0x{9,C}.bin.zst` and `8EA4-1-2-0x{9,C}.bin.zst` (an extra index
field). Creating symlinks for the requested names in `/lib/firmware` removes
the load errors.
- That does not restore sound. The kernel has no machine-driver match for RT712
+ 2x TAS2783, and the ACPI tables do not describe the amps as SDCA speaker
functions. Only the jack, mic and HDMI topologies get loaded, never the
installed `sof-sdca-2amp-id2.tplg`.
- I have not tested a kernel patch. This probably needs a
`soc-acpi-intel-ptl-match.c` entry or equivalent. I have also filed it upstream
with the SOF project.
**Request:** please include audio support for this model in a kernel
update, and align the TAS2783 firmware file naming between the kernel
and linux-firmware packages.
ProblemType: Bug
DistroRelease: Ubuntu 26.10
Package: linux-image-7.3.0-9-generic 7.3.0-9.9
ProcVersionSignature: Ubuntu 7.3.0-9.9-generic 7.3.0-rc6
Uname: Linux 7.3.0-9-generic x86_64
ApportVersion: 2.36.0-0ubuntu1
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: kevin 8192 F.... wireplumber
/dev/snd/seq: kevin 8188 F.... pipewire
CasperMD5CheckResult: pass
CurrentDesktop: ubuntu:GNOME
Date: Sat Oct 17 20:56:37 2026
InstallationDate: Installed on 2026-10-17 (0 days ago)
InstallationMedia: Ubuntu 26.10 "Stonking Stingray" - Official amd64 (20261013)
MachineType: HP HP OmniBook X Flip Laptop 14-kb0xxx
ProcFB: 0 xedrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-7.3.0-9-generic
root=UUID=be9e4e6d-9ff2-4d3c-89fe-f954199f0334 ro quiet splash
crashkernel=2G-4G:320M,4G-32G:512M,32G-64G:1024M,64G-128G:2048M,128G-:4096M
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 04/16/2026
dmi.bios.release: 15.10
dmi.bios.vendor: Insyde
dmi.bios.version: F.10
dmi.board.asset.tag: Type2 - Board Asset Tag
dmi.board.name: 8EA4
dmi.board.vendor: HP
dmi.board.version: 12.26
dmi.chassis.asset.tag: Chassis Asset Tag
dmi.chassis.type: 31
dmi.chassis.vendor: HP
dmi.chassis.version: Chassis Version
dmi.ec.firmware.release: 12.26
dmi.modalias:
dmi:bvnInsyde:bvrF.10:bd04/16/2026:br15.10:efr12.26:svnHP:pnHPOmniBookXFlipLaptop14-kb0xxx:pvrType1ProductConfigId:rvnHP:rn8EA4:rvr12.26:cvnHP:ct31:cvrChassisVersion:skuDQ8R9EA#ABU:pfa103C_5335M8HPOmniBookX:
dmi.product.family: 103C_5335M8 HP OmniBook X
dmi.product.name: HP OmniBook X Flip Laptop 14-kb0xxx
dmi.product.sku: DQ8R9EA#ABU
dmi.product.version: Type1ProductConfigId
dmi.sys.vendor: HP
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug stonking wayland-session
** Bug watch added: github.com/thesofproject/linux/issues #5981
https://github.com/thesofproject/linux/issues/5981
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https://bugs.launchpad.net/bugs/2171307
Title:
No audio output (Dummy Output only) on HP OmniBook X Flip 14-kb0xxx,
Panther Lake, kernel 7.3.0-9 (Ubuntu 26.10)
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