[Bug 2116011] [NEW] Mainline kernel 6.15.4: snd_soc_intel_soundwire_sof_mach.ko missing despite CONFIG enabled

Public bug reported:

On Ubuntu Mainline Kernel 6.15.4-061504-generic, the kernel
configuration contains:

CONFIG_SND_SOC_INTEL_SOUNDWIRE_SOF_MACH=m

However, the compiled kernel module
`snd_soc_intel_soundwire_sof_mach.ko` is missing from the installed
package:

linux-modules-6.15.4-061504-generic

This module is required for audio functionality on Intel platforms using
SOF + SoundWire (e.g. Lunar Lake, Meteor Lake), including:

- Intel Lunar Lake SoC
- CS42L43/CS35L56 codec combinations
- ThinkPad X9 Gen 1 and similar hardware

Without this module, affected systems have no audio devices except
"Dummy Output".

---

**Expected behavior**:
- The module should be included in the package and available under:
/lib/modules/6.15.4-061504-generic/kernel/sound/soc/intel/boards/

**Actual behavior**:
- The module is missing.
- `modinfo` fails with:

modinfo: ERROR: Module snd_soc_intel_soundwire_sof_mach not found.

---

**Steps to reproduce**:
1. Install 6.15.4 from https://kernel.ubuntu.com/mainline/v6.15.4/
2. Reboot into kernel 6.15.4-061504-generic
3. Run:

modinfo snd_soc_intel_soundwire_sof_mach

---

**Impact**:
This module is required for proper SOF SoundWire audio support on modern Intel hardware. Several distributions (Fedora, Arch) include this module by default. Without it, mainline kernels are incomplete for current-generation laptops and embedded devices.

Please include the compiled module `snd_soc_intel_soundwire_sof_mach.ko`
in future linux-modules-* packages when CONFIG is set to `=m`.

Tested system:

Kernel: 6.15.4-061504-generic
GCC: 14.2.0
Arch: amd64
Device: Lenovo ThinkPad X9 14 Gen 1 (Intel Lunar Lake)

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

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https://bugs.launchpad.net/bugs/2116011

Title:
Mainline kernel 6.15.4: snd_soc_intel_soundwire_sof_mach.ko missing
despite CONFIG enabled

Status in linux package in Ubuntu:
New

Bug description:
On Ubuntu Mainline Kernel 6.15.4-061504-generic, the kernel
configuration contains:

CONFIG_SND_SOC_INTEL_SOUNDWIRE_SOF_MACH=m

However, the compiled kernel module
`snd_soc_intel_soundwire_sof_mach.ko` is missing from the installed
package:

linux-modules-6.15.4-061504-generic

This module is required for audio functionality on Intel platforms
using SOF + SoundWire (e.g. Lunar Lake, Meteor Lake), including:

- Intel Lunar Lake SoC
- CS42L43/CS35L56 codec combinations
- ThinkPad X9 Gen 1 and similar hardware

Without this module, affected systems have no audio devices except
"Dummy Output".

---

**Expected behavior**:
- The module should be included in the package and available under:
/lib/modules/6.15.4-061504-generic/kernel/sound/soc/intel/boards/

**Actual behavior**:
- The module is missing.
- `modinfo` fails with:

modinfo: ERROR: Module snd_soc_intel_soundwire_sof_mach not found.

---

**Steps to reproduce**:
1. Install 6.15.4 from https://kernel.ubuntu.com/mainline/v6.15.4/
2. Reboot into kernel 6.15.4-061504-generic
3. Run:

modinfo snd_soc_intel_soundwire_sof_mach

---

**Impact**:
This module is required for proper SOF SoundWire audio support on modern Intel hardware. Several distributions (Fedora, Arch) include this module by default. Without it, mainline kernels are incomplete for current-generation laptops and embedded devices.

Please include the compiled module
`snd_soc_intel_soundwire_sof_mach.ko` in future linux-modules-*
packages when CONFIG is set to `=m`.

Tested system:

Kernel: 6.15.4-061504-generic
GCC: 14.2.0
Arch: amd64
Device: Lenovo ThinkPad X9 14 Gen 1 (Intel Lunar Lake)

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