[Bug 2171307] Re: No audio output (Dummy Output only) on HP OmniBook X Flip 14-kb0xxx, Panther Lake, kernel 7.3.0-9 (Ubuntu 26.10)

** Changed in: linux Status: Unknown => New -- You received this bug notification because you are subscribed to linux in Ubuntu. Matching subscriptions: Bgg, Bmail, Nb 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) Status in Linux: New Status in linux package in Ubuntu: New Bug description: **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 To manage notifications about this bug go to: https://bugs.launchpad.net/linux/+bug/2171307/+subscriptions