Public bug reported:
On ASUS Zenbook UX3405MA (Intel Core Ultra 7 155H / Meteor Lake-P), kernel
versions 7.0.0-22 and 7.0.0-27 crash the SOF DSP on first audio playback
attempt, making all wired audio (headphones, speakers)
permanently silent until reboot. Bluetooth audio is unaffected. Hardware is
confirmed good (Windows works; Ubuntu 26.04 live CD with kernel 7.0.0-14 works).
Root cause:
The installed firmware-sof-signed 2025.12.2-1 provides IPC4 topology
files with ABI version 3:29:1. The kernel SOF driver reports its
supported ABI as 3:23:1 and logs:
sof-audio-pci-intel-mtl 0000:00:1f.3: Topology: ABI 3:29:1 Kernel ABI 3:23:1
On kernel 7.0.0-14 (confirmed from live CD) this mismatch is handled gracefully
and audio works. Starting with 7.0.0-22, the kernel's IPC4 topology parser
sends malformed pipeline configuration to the DSP
firmware when it encounters the newer ABI, causing the DSP to crash. All
subsequent playback returns -EHOSTDOWN. The DSP crash is confirmed via debugfs:
- /sys/kernel/debug/sof/fw_state — empty (cleared after crash)
- /sys/kernel/debug/sof/fw_version — empty
- /sys/kernel/debug/sof/exception — non-zero binary crash dump
- /sys/kernel/debug/sof/fw_regs — first dword = 0x05 (exception state)
Steps to reproduce:
1. Install Ubuntu 26.04 with firmware-sof-signed 2025.12.2-1 (default)
2. Boot kernel 7.0.0-22 or 7.0.0-27 on affected hardware
3. Attempt any audio playback
4. Observe: Playback open error: -112, Host is down; all subsequent playback
attempts also fail with EHOSTDOWN until reboot
Expected behaviour:
The SOF driver should handle a topology file with a newer minor ABI
version gracefully — parsing only the fields it understands (as done in
7.0.0-14) — without crashing the DSP.
Workaround:
Patching the 2-byte minor version field in
/lib/firmware/intel/sof-ipc4-tplg/sof-hda-generic-2ch.tplg at offset 0x96 from
0x1d 0x00 (29) to 0x17 0x00 (23) causes the kernel to apply the 3:23:1 parsing
path and audio works correctly on both 7.0.0-22 and 7.0.0-27.
Hardware: ASUS Zenbook UX3405MA, Intel Core Ultra 7 155H (Meteor
Lake-P), ALC294 HDA codec (SSID 1043:1A63), CS35L41 speaker amps (SPI,
SSID 10431A63)
Affected kernels: 7.0.0-22-generic, 7.0.0-27-generic
Working kernel: 7.0.0-14-generic (via live CD)
firmware-sof-signed: 2025.12.2-1
ProblemType: Bug
DistroRelease: Ubuntu 26.04
Package: linux-image-7.0.0-27-generic 7.0.0-27.27
ProcVersionSignature: Ubuntu 7.0.0-27.27-generic 7.0.6
Uname: Linux 7.0.0-27-generic x86_64
ApportVersion: 2.34.0-0ubuntu2
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: jens 10150 F.... pipewire
jens 10170 F.... wireplumber
/dev/snd/seq: jens 10150 F.... pipewire
CasperMD5CheckResult: pass
CurrentDesktop: ubuntu:GNOME
Date: Tue Jun 30 22:31:56 2026
InstallationDate: Installed on 2026-02-04 (146 days ago)
InstallationMedia: Ubuntu 25.10 "Questing Quokka" - Release amd64 (20251007)
MachineType: ASUSTeK COMPUTER INC. ASUS Zenbook 14 UX3405MA
ProcEnviron:
LANG=en_US.UTF-8
PATH=(custom, no user)
SHELL=/bin/bash
TERM=xterm-256color
XDG_RUNTIME_DIR=<set>
ProcFB: 0 i915drmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-7.0.0-27-generic
root=UUID=5adc1058-8261-4c9f-877c-899756f0d609 ro quiet splash
acpi_enforce_resources=lax
crashkernel=2G-4G:320M,4G-32G:512M,32G-64G:1024M,64G-128G:2048M,128G-:4096M
PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No
PulseAudio daemon running, or not running as session daemon.
SourcePackage: linux
UpgradeStatus: Upgraded to resolute on 2026-05-16 (45 days ago)
dmi.bios.date: 06/06/2025
dmi.bios.release: 5.32
dmi.bios.vendor: American Megatrends International, LLC.
dmi.bios.version: UX3405MA.311
dmi.board.asset.tag: ATN12345678901234567
dmi.board.name: UX3405MA
dmi.board.vendor: ASUSTeK COMPUTER INC.
dmi.board.version: 1.0
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: ASUSTeK COMPUTER INC.
dmi.chassis.version: 1.0
dmi.modalias:
dmi:bvnAmericanMegatrendsInternational,LLC.:bvrUX3405MA.311:bd06/06/2025:br5.32:svnASUSTeKCOMPUTERINC.:pnASUSZenbook14UX3405MA:pvr1.0:rvnASUSTeKCOMPUTERINC.:rnUX3405MA:rvr1.0:cvnASUSTeKCOMPUTERINC.:ct10:cvr1.0:sku:pfaASUSZenbook14:
dmi.product.family: ASUS Zenbook 14
dmi.product.name: ASUS Zenbook 14 UX3405MA
dmi.product.version: 1.0
dmi.sys.vendor: ASUSTeK COMPUTER INC.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug resolute wayland-session
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https://bugs.launchpad.net/bugs/2158818
Title:
SOF IPC4 topology ABI mismatch causes DSP crash (EHOSTDOWN) —
regression in 7.0.0-22
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