Public bug reported:
After upgrading from Ubuntu 26.04 LTS to 26.10, the internal speakers
produce no sound.
Hardware: Acer SFN14-55, BIOS BM_BI_MTL326_IN008A_L (07/22/2026)
Audio: Intel Meteor Lake-P, SOF SoundWire card, Realtek rt722 codec
Kernel: 7.3.0-9-generic
Topology: sof-sdca-1amp-id2.tplg (Topology ABI 3:29:1, Kernel ABI 3:23:1)
Symptoms:
- The sound card is detected and the Speaker is the default PipeWire sink
(volume 1.00, not muted).
- All ALSA controls are unmuted and at maximum (Speaker Switch, rt722
FU05/FU06, SOF mixer volumes).
- The speaker PCM (card0 device 2) shows state RUNNING with hw_ptr advancing,
but nothing is audible.
- SOF firmware 2.15.0.1 loads without errors, and apt reports everything up to
date.
Kernel error on every boot, triggered when WirePlumber opens the stream:
UBSAN: shift-out-of-bounds in sound/soc/sof/ipc4-topology.c:2471:13
shift exponent 18446744069414584384 is too large for 64-bit type 'long unsigned
int'
Trace: _sof_ipc4_prepare_copier_module -> sof_prepare_widgets_in_path ->
sof_pcm_hw_params
Not yet tested: headphones, an older kernel, other distros. Only kernel
7.3.0-9 is available in the repository.
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: shubham-sahu 4347 F.... pipewire
shubham-sahu 4351 F.... wireplumber
/dev/snd/pcmC0D2p: shubham-sahu 4347 F...m pipewire
/dev/snd/seq: shubham-sahu 4347 F.... pipewire
CasperMD5CheckResult: pass
CurrentDesktop: ubuntu:GNOME
Date: Tue Oct 20 12:44:54 2026
InstallationDate: Installed on 2026-10-19 (0 days ago)
InstallationMedia: Ubuntu 26.10 "Stonking Stingray" - Official amd64 (20261013)
MachineType: Acer SFN14-55
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-7.3.0-9-generic
root=UUID=9f3dcf38-9fb4-4cdf-ad94-8769f5e3b47d 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: 07/22/2026
dmi.bios.release: 5.32
dmi.bios.vendor: American Megatrends International, LLC.
dmi.bios.version: BM_BI_MTL326_IN008A_L
dmi.board.asset.tag: Default string
dmi.board.name: SFN14-55
dmi.board.vendor: Acer
dmi.board.version: Default string
dmi.chassis.asset.tag: Default string
dmi.chassis.type: 10
dmi.chassis.vendor: Default string
dmi.chassis.version: Default string
dmi.ec.firmware.release: 1.10
dmi.modalias:
dmi:bvnAmericanMegatrendsInternational,LLC.:bvrBM_BI_MTL326_IN008A_L:bd07/22/2026:br5.32:efr1.10:svnAcer:pnSFN14-55:pvrBM_BI_MTL326_IN008A_L:rvnAcer:rnSFN14-55:rvrDefaultstring:cvnDefaultstring:ct10:cvrDefaultstring:sku0000000000000000:pfaSwiftNeo:
dmi.product.family: Swift Neo
dmi.product.name: SFN14-55
dmi.product.sku: 0000000000000000
dmi.product.version: BM_BI_MTL326_IN008A_L
dmi.sys.vendor: Acer
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug stonking wayland-session
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https://bugs.launchpad.net/bugs/2171471
Title:
No sound from internal speakers on Acer SFN14-55 (Meteor Lake, rt722
SoundWire); UBSAN shift-out-of-bounds in sof/ipc4-topology.c on
7.3.0-9
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