OK, I reinstalled the machine with Ubuntu 24.10 using the traditional LUKS+LVM encryption (so using conventional deb packaged kernels) and confirmed that sound works out of the box. So the problem really seems to be the firmware that is bundled with the Snap-managed kernels.
-- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to alsa-driver in Ubuntu. https://bugs.launchpad.net/bugs/2099845 Title: Sound not working on Dell XPS 14 9440 with Snap-managed kernel Status in alsa-driver package in Ubuntu: New Bug description: I cannot get the sound working my Dell XPS 14 9440 laptop. Importantly, this laptop is using TPM FDE (so the kernel is managed by Snap). I had exactly these same issues with Ubuntu 24.04, but I reinstalled with 24.10 and this bug is documenting my experience in 24.10. Here's the hardware device: $ sudo lspci | grep Audio 0000:00:1f.3 Multimedia audio controller: Intel Corporation Meteor Lake-P HD Audio Controller (rev 20) The dmesg output clearly indicates the problem: [ 37.729950] sof-audio-pci-intel-mtl 0000:00:1f.3: enabling device (0000 -> 0002) [ 37.730039] sof-audio-pci-intel-mtl 0000:00:1f.3: DSP detected with PCI class/subclass/prog-if 0x040100 [ 37.730091] sof-audio-pci-intel-mtl 0000:00:1f.3: bound 0000:00:02.0 (ops i915_audio_component_bind_ops [i915]) [ 37.736671] sof-audio-pci-intel-mtl 0000:00:1f.3: use msi interrupt mode [ 37.753104] sof-audio-pci-intel-mtl 0000:00:1f.3: hda codecs found, mask 4 [ 37.753411] sof-audio-pci-intel-mtl 0000:00:1f.3: SOF firmware and/or topology file not found. [ 37.756034] sof-audio-pci-intel-mtl 0000:00:1f.3: Supported default profiles [ 37.756036] sof-audio-pci-intel-mtl 0000:00:1f.3: - ipc type 1 (Requested): [ 37.756038] sof-audio-pci-intel-mtl 0000:00:1f.3: Firmware file: intel/sof-ipc4/mtl/sof-mtl.ri [ 37.756040] sof-audio-pci-intel-mtl 0000:00:1f.3: Topology file: intel/sof-ace-tplg/sof-mtl-cs42l43-l0-cs35l56-l23.tplg [ 37.756041] sof-audio-pci-intel-mtl 0000:00:1f.3: Check if you have 'sof-firmware' package installed. [ 37.756043] sof-audio-pci-intel-mtl 0000:00:1f.3: Optionally it can be manually downloaded from: [ 37.756044] sof-audio-pci-intel-mtl 0000:00:1f.3: https://github.com/thesofproject/sof-bin/ [ 37.758046] sof-audio-pci-intel-mtl 0000:00:1f.3: error: sof_probe_work failed err: -2 If I try to install the firmware-sof-signed package, it fails and gets into a pretty bad state because it tries to write to a readonly location. Seems like that package is entirely incompatible with the Snap-managed kernel this machine has: $ sudo apt install firmware-sof-signed The following package was automatically installed and is no longer required: python3-netifaces Use 'sudo apt autoremove' to remove it. Installing: firmware-sof-signed Summary: Upgrading: 0, Installing: 1, Removing: 0, Not Upgrading: 1 Download size: 7,093 kB Space needed: 9,779 kB / 464 GB available Get:1 http://us.archive.ubuntu.com/ubuntu oracular-updates/main amd64 firmware-sof-signed all 2024.06-1ubuntu1.3 [7,093 kB] Fetched 7,093 kB in 1s (7,389 kB/s) Selecting previously unselected package firmware-sof-signed. (Reading database ... 107544 files and directories currently installed.) Preparing to unpack .../firmware-sof-signed_2024.06-1ubuntu1.3_all.deb ... Unpacking firmware-sof-signed (2024.06-1ubuntu1.3) ... dpkg: error processing archive /var/cache/apt/archives/firmware-sof-signed_2024.06-1ubuntu1.3_all.deb (--unpack): error creating directory './usr/lib/firmware/intel/sof': Read-only file system dpkg: error while cleaning up: unable to remove newly-extracted version of '/usr/lib/firmware/intel/sof': Read-only file system dpkg-deb: error: paste subprocess was killed by signal (Broken pipe) Errors were encountered while processing: /var/cache/apt/archives/firmware-sof-signed_2024.06-1ubuntu1.3_all.deb Error: Sub-process /usr/bin/dpkg returned an error code (1) I know from a previous Ubuntu install that didn't use TPM-based FDE that I can manually place the SOF firmware files into place and get it working (hackily). But that approach won't work here with the Snap- managed kernels. One strange thing that I noticed was that the Oracular installer environment *did* have working sound. And indeed, the dmesg output there showed that it found the correct SOF firmware files and loaded the driver just fine. But once I installed Ubuntu to the disk, sound was in this broken state. ProblemType: Bug DistroRelease: Ubuntu 24.10 Package: alsa-base 1.0.25+dfsg-0ubuntu7 ProcVersionSignature: Ubuntu 6.11.0-18.18-generic 6.11.11 Uname: Linux 6.11.0-18-generic x86_64 ApportVersion: 2.30.0-0ubuntu4 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/seq: kat 3575 F.... pipewire CasperMD5CheckResult: pass CurrentDesktop: ubuntu:GNOME Date: Sun Feb 23 16:55:15 2025 MachineType: Dell Inc. XPS 14 9440 PackageArchitecture: all ProcEnviron: LANG=en_US.UTF-8 PATH=(custom, no user) SHELL=/bin/bash TERM=xterm-256color XDG_RUNTIME_DIR=<set> SourcePackage: alsa-driver Symptom: audio UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 10/21/2024 dmi.bios.release: 1.9 dmi.bios.vendor: Dell Inc. dmi.bios.version: 1.9.0 dmi.board.name: 0CWTN6 dmi.board.vendor: Dell Inc. dmi.board.version: A00 dmi.chassis.type: 10 dmi.chassis.vendor: Dell Inc. dmi.ec.firmware.release: 1.22 dmi.modalias: dmi:bvnDellInc.:bvr1.9.0:bd10/21/2024:br1.9:efr1.22:svnDellInc.:pnXPS149440:pvr:rvnDellInc.:rn0CWTN6:rvrA00:cvnDellInc.:ct10:cvr:sku0C6B: dmi.product.family: XPS dmi.product.name: XPS 14 9440 dmi.product.sku: 0C6B dmi.sys.vendor: Dell Inc. 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