[Bug 2102145] [NEW] Cannot use sof-firmware-signed with pc-kernel snap / sof-firmware not included in pc-kernel (no audio)

Lukas Mayer 2102145 at bugs.launchpad.net
Wed Mar 12 16:51:35 UTC 2025 

Public bug reported:

# System
This concerns Ubuntu 24.04 LTS running the pc-kernel snap with TPM-based full disk encryption. 
The device uses an Intel Core Ultra 5 125U .

# Description

When using the pc-kernel snap, no audio is available to the system:

```
[    6.200060] sof-audio-pci-intel-mtl 0000:00:1f.3: DSP detected with PCI class/subclass/prog-if info 0x040100
[    6.200111] sof-audio-pci-intel-mtl 0000:00:1f.3: Digital mics found on Skylake+ platform, using SOF driver
[    6.200388] sof-audio-pci-intel-mtl 0000:00:1f.3: DSP detected with PCI class/subclass/prog-if 0x040100
[    6.200827] sof-audio-pci-intel-mtl 0000:00:1f.3: bound 0000:00:02.0 (ops i915_audio_component_bind_ops [i915])
[    6.207483] sof-audio-pci-intel-mtl 0000:00:1f.3: use msi interrupt mode
[    6.293899] sof-audio-pci-intel-mtl 0000:00:1f.3: hda codecs found, mask 5
[    6.293909] sof-audio-pci-intel-mtl 0000:00:1f.3: using HDA machine driver skl_hda_dsp_generic now
[    6.293918] sof-audio-pci-intel-mtl 0000:00:1f.3: DMICs detected in NHLT tables: 2
[    6.294613] sof-audio-pci-intel-mtl 0000:00:1f.3: SOF firmware and/or topology file not found.
[    6.295594] sof-audio-pci-intel-mtl 0000:00:1f.3: Supported default profiles
[    6.295596] sof-audio-pci-intel-mtl 0000:00:1f.3: - ipc type 1 (Requested):
[    6.295599] sof-audio-pci-intel-mtl 0000:00:1f.3:  Firmware file: intel/sof-ipc4/mtl/sof-mtl.ri
[    6.295601] sof-audio-pci-intel-mtl 0000:00:1f.3:  Topology file: intel/sof-ace-tplg/sof-hda-generic-2ch.tplg
[    6.295603] sof-audio-pci-intel-mtl 0000:00:1f.3: Check if you have 'sof-firmware' package installed.
[    6.295606] sof-audio-pci-intel-mtl 0000:00:1f.3: Optionally it can be manually downloaded from:
[    6.295607] sof-audio-pci-intel-mtl 0000:00:1f.3:    https://github.com/thesofproject/sof-bin/
[    6.297818] sof-audio-pci-intel-mtl 0000:00:1f.3: error: sof_probe_work failed err: -2
```[    6.200060] sof-audio-pci-intel-mtl 0000:00:1f.3: DSP detected with PCI class/subclass/prog-if info 0x040100
[    6.200111] sof-audio-pci-intel-mtl 0000:00:1f.3: Digital mics found on Skylake+ platform, using SOF driver
[    6.200388] sof-audio-pci-intel-mtl 0000:00:1f.3: DSP detected with PCI class/subclass/prog-if 0x040100
[    6.200827] sof-audio-pci-intel-mtl 0000:00:1f.3: bound 0000:00:02.0 (ops i915_audio_component_bind_ops [i915])
[    6.207483] sof-audio-pci-intel-mtl 0000:00:1f.3: use msi interrupt mode
[    6.293899] sof-audio-pci-intel-mtl 0000:00:1f.3: hda codecs found, mask 5
[    6.293909] sof-audio-pci-intel-mtl 0000:00:1f.3: using HDA machine driver skl_hda_dsp_generic now
[    6.293918] sof-audio-pci-intel-mtl 0000:00:1f.3: DMICs detected in NHLT tables: 2
[    6.294613] sof-audio-pci-intel-mtl 0000:00:1f.3: SOF firmware and/or topology file not found.
[    6.295594] sof-audio-pci-intel-mtl 0000:00:1f.3: Supported default profiles
[    6.295596] sof-audio-pci-intel-mtl 0000:00:1f.3: - ipc type 1 (Requested):
[    6.295599] sof-audio-pci-intel-mtl 0000:00:1f.3:  Firmware file: intel/sof-ipc4/mtl/sof-mtl.ri
[    6.295601] sof-audio-pci-intel-mtl 0000:00:1f.3:  Topology file: intel/sof-ace-tplg/sof-hda-generic-2ch.tplg
[    6.295603] sof-audio-pci-intel-mtl 0000:00:1f.3: Check if you have 'sof-firmware' package installed.
[    6.295606] sof-audio-pci-intel-mtl 0000:00:1f.3: Optionally it can be manually downloaded from:
[    6.295607] sof-audio-pci-intel-mtl 0000:00:1f.3:    https://github.com/thesofproject/sof-bin/
[    6.297818] sof-audio-pci-intel-mtl 0000:00:1f.3: error: sof_probe_work failed err: -2

```

When trying to install firmware-sof-signed using apt, the installation
fails to pc-kernel's read-only filesystem:

```
dpkg: error processing archive /var/cache/apt/archives/firmware-sof-signed_2023.12.1-1ubuntu1.4_all.deb (--unpack):
 unable to create '/lib/firmware/intel/sof/community/sof-apl.ri.zst.dpkg-new' (while processing './lib/firmware/intel/sof/community/sof-apl.ri.zst'): Read-only file system
dpkg: error while cleaning up:
 unable to remove newly-extracted version of '/lib/firmware/intel/sof/community/sof-apl.ri.zst': 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_2023.12.1-1ubuntu1.4_all.deb
E: Sub-process /usr/bin/dpkg returned an error code (1)
```

No audio devices will be available to the system.


# Expected behaviour
Referenced firmware such as sof-audio-pci-intel-mtl should be included into the pc-kernel snap.

ProblemType: Bug
DistroRelease: Ubuntu 24.04
Package: apt 2.7.14build2
ProcVersionSignature: Ubuntu 6.8.0-54.56-generic 6.8.12
Uname: Linux 6.8.0-54-generic x86_64
ApportVersion: 2.28.1-0ubuntu3.3
Architecture: amd64
CasperMD5CheckResult: pass
CurrentDesktop: ubuntu:GNOME
Date: Wed Mar 12 17:43:11 2025
ProcEnviron:
 LANG=de_DE.UTF-8
 PATH=(custom, no user)
 SHELL=/bin/bash
 TERM=xterm-256color
 XDG_RUNTIME_DIR=<set>
SourcePackage: apt
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: apt (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug noble wayland-session

-- 
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https://bugs.launchpad.net/bugs/2102145

Title:
  Cannot use sof-firmware-signed with pc-kernel snap / sof-firmware not
  included in pc-kernel (no audio)

Status in apt package in Ubuntu:
  New

Bug description:
  # System
  This concerns Ubuntu 24.04 LTS running the pc-kernel snap with TPM-based full disk encryption. 
  The device uses an Intel Core Ultra 5 125U .

  # Description

  When using the pc-kernel snap, no audio is available to the system:

  ```
  [    6.200060] sof-audio-pci-intel-mtl 0000:00:1f.3: DSP detected with PCI class/subclass/prog-if info 0x040100
  [    6.200111] sof-audio-pci-intel-mtl 0000:00:1f.3: Digital mics found on Skylake+ platform, using SOF driver
  [    6.200388] sof-audio-pci-intel-mtl 0000:00:1f.3: DSP detected with PCI class/subclass/prog-if 0x040100
  [    6.200827] sof-audio-pci-intel-mtl 0000:00:1f.3: bound 0000:00:02.0 (ops i915_audio_component_bind_ops [i915])
  [    6.207483] sof-audio-pci-intel-mtl 0000:00:1f.3: use msi interrupt mode
  [    6.293899] sof-audio-pci-intel-mtl 0000:00:1f.3: hda codecs found, mask 5
  [    6.293909] sof-audio-pci-intel-mtl 0000:00:1f.3: using HDA machine driver skl_hda_dsp_generic now
  [    6.293918] sof-audio-pci-intel-mtl 0000:00:1f.3: DMICs detected in NHLT tables: 2
  [    6.294613] sof-audio-pci-intel-mtl 0000:00:1f.3: SOF firmware and/or topology file not found.
  [    6.295594] sof-audio-pci-intel-mtl 0000:00:1f.3: Supported default profiles
  [    6.295596] sof-audio-pci-intel-mtl 0000:00:1f.3: - ipc type 1 (Requested):
  [    6.295599] sof-audio-pci-intel-mtl 0000:00:1f.3:  Firmware file: intel/sof-ipc4/mtl/sof-mtl.ri
  [    6.295601] sof-audio-pci-intel-mtl 0000:00:1f.3:  Topology file: intel/sof-ace-tplg/sof-hda-generic-2ch.tplg
  [    6.295603] sof-audio-pci-intel-mtl 0000:00:1f.3: Check if you have 'sof-firmware' package installed.
  [    6.295606] sof-audio-pci-intel-mtl 0000:00:1f.3: Optionally it can be manually downloaded from:
  [    6.295607] sof-audio-pci-intel-mtl 0000:00:1f.3:    https://github.com/thesofproject/sof-bin/
  [    6.297818] sof-audio-pci-intel-mtl 0000:00:1f.3: error: sof_probe_work failed err: -2
  ```[    6.200060] sof-audio-pci-intel-mtl 0000:00:1f.3: DSP detected with PCI class/subclass/prog-if info 0x040100
  [    6.200111] sof-audio-pci-intel-mtl 0000:00:1f.3: Digital mics found on Skylake+ platform, using SOF driver
  [    6.200388] sof-audio-pci-intel-mtl 0000:00:1f.3: DSP detected with PCI class/subclass/prog-if 0x040100
  [    6.200827] sof-audio-pci-intel-mtl 0000:00:1f.3: bound 0000:00:02.0 (ops i915_audio_component_bind_ops [i915])
  [    6.207483] sof-audio-pci-intel-mtl 0000:00:1f.3: use msi interrupt mode
  [    6.293899] sof-audio-pci-intel-mtl 0000:00:1f.3: hda codecs found, mask 5
  [    6.293909] sof-audio-pci-intel-mtl 0000:00:1f.3: using HDA machine driver skl_hda_dsp_generic now
  [    6.293918] sof-audio-pci-intel-mtl 0000:00:1f.3: DMICs detected in NHLT tables: 2
  [    6.294613] sof-audio-pci-intel-mtl 0000:00:1f.3: SOF firmware and/or topology file not found.
  [    6.295594] sof-audio-pci-intel-mtl 0000:00:1f.3: Supported default profiles
  [    6.295596] sof-audio-pci-intel-mtl 0000:00:1f.3: - ipc type 1 (Requested):
  [    6.295599] sof-audio-pci-intel-mtl 0000:00:1f.3:  Firmware file: intel/sof-ipc4/mtl/sof-mtl.ri
  [    6.295601] sof-audio-pci-intel-mtl 0000:00:1f.3:  Topology file: intel/sof-ace-tplg/sof-hda-generic-2ch.tplg
  [    6.295603] sof-audio-pci-intel-mtl 0000:00:1f.3: Check if you have 'sof-firmware' package installed.
  [    6.295606] sof-audio-pci-intel-mtl 0000:00:1f.3: Optionally it can be manually downloaded from:
  [    6.295607] sof-audio-pci-intel-mtl 0000:00:1f.3:    https://github.com/thesofproject/sof-bin/
  [    6.297818] sof-audio-pci-intel-mtl 0000:00:1f.3: error: sof_probe_work failed err: -2

  ```

  When trying to install firmware-sof-signed using apt, the installation
  fails to pc-kernel's read-only filesystem:

  ```
  dpkg: error processing archive /var/cache/apt/archives/firmware-sof-signed_2023.12.1-1ubuntu1.4_all.deb (--unpack):
   unable to create '/lib/firmware/intel/sof/community/sof-apl.ri.zst.dpkg-new' (while processing './lib/firmware/intel/sof/community/sof-apl.ri.zst'): Read-only file system
  dpkg: error while cleaning up:
   unable to remove newly-extracted version of '/lib/firmware/intel/sof/community/sof-apl.ri.zst': 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_2023.12.1-1ubuntu1.4_all.deb
  E: Sub-process /usr/bin/dpkg returned an error code (1)
  ```

  No audio devices will be available to the system.

  
  # Expected behaviour
  Referenced firmware such as sof-audio-pci-intel-mtl should be included into the pc-kernel snap.

  ProblemType: Bug
  DistroRelease: Ubuntu 24.04
  Package: apt 2.7.14build2
  ProcVersionSignature: Ubuntu 6.8.0-54.56-generic 6.8.12
  Uname: Linux 6.8.0-54-generic x86_64
  ApportVersion: 2.28.1-0ubuntu3.3
  Architecture: amd64
  CasperMD5CheckResult: pass
  CurrentDesktop: ubuntu:GNOME
  Date: Wed Mar 12 17:43:11 2025
  ProcEnviron:
   LANG=de_DE.UTF-8
   PATH=(custom, no user)
   SHELL=/bin/bash
   TERM=xterm-256color
   XDG_RUNTIME_DIR=<set>
  SourcePackage: apt
  UpgradeStatus: No upgrade log present (probably fresh install)

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