desktops: install alsa-ucm-conf at minimal tier

[igorpecovnik]

Summary

Without `alsa-ucm-conf` installed, PipeWire / wireplumber see complex sound cards (Intel SOF on Lunar/Meteor/Panther Lake laptops, Qualcomm Snapdragon X, AMD ACP DSP, …) but have no per-machine recipe for which PCM device is the speaker output, which controls to unmute, or how to route on jack-insert.

Result: kernel-level audio is fully alive (`aplay -l` shows the Speaker pcm; `speaker-test -D plughw:0,2` plays), but GNOME / KDE Sound shows only "Dummy Output" and the speakers stay silent.

Verified

ThinkPad X9-15 Gen 1 (LNL, CS42L43 SoundWire jack + CS35L56 SPI amps, DMI `21Q6001MGE`). Same kernel + same SOF firmware + same Cirrus blobs + same topology as a working Ubuntu OEM 6.17 boot of the same machine. The only difference between "silent" and "working" was this package.

Scope

• minimal tier of common.yaml — every desktop / release / arch / DE combo picks it up.
• Architecture: all package, ~1 MB on disk.
• Inert on simpler audio chains (HDMI-only SBCs, USB DAC, basic codec setups).

Pairs with

armbian/build#9858 — adds the same package to UEFI image builds via `uefi_common.inc`, so image-built rootfs gets it from the build side. This PR ensures the runtime `armbian-config module_desktops install` path also gets it on every desktop.

Verified across releases / tiers

```
noble/minimal: alsa-ucm-conf
noble/mid: alsa-ucm-conf
resolute/minimal: alsa-ucm-conf
resolute/mid: alsa-ucm-conf
trixie/minimal: alsa-ucm-conf
trixie/mid: alsa-ucm-conf
bookworm/minimal: alsa-ucm-conf
bookworm/mid: alsa-ucm-conf
```

Test plan

• Install GNOME minimal on noble — `dpkg -l alsa-ucm-conf` shows installed
• Boot on an SOF-equipped laptop — Sound panel shows real Speaker sink (not Dummy Output)
• Boot on a non-laptop SBC — no regression, package is inert

[coderabbitai]

Caution

Review failed

The pull request is closed.

ℹ️ Recent review info

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Configuration used: Organization UI

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Run ID: 17aab1ac-e3ac-46d6-bac6-2a5d1ea79102

📥 Commits

Reviewing files that changed from the base of the PR and between db0d2ce and 5673864.

📒 Files selected for processing (1)

• tools/modules/desktops/yaml/common.yaml

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Walkthrough

This PR adds the alsa-ucm-conf package to the minimal desktop tier in the common YAML configuration. The change includes documentation comments explaining that this package is required for proper ALSA Use Case Manager behavior when using PipeWire/wireplumber, specifically to avoid the "Dummy Output" audio configuration issue. The addition occurs within the minimal tier's package list and is accompanied by contextual comments clarifying its necessity at this tier level.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Possibly related PRs

• armbian/configng#923: Both PRs modify tools/modules/desktops/yaml/common.yaml to add alsa-ucm-conf to tiers.minimal.packages (including the same related comment context).

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately and concisely describes the main change: adding alsa-ucm-conf package to the minimal desktop tier.
Description check	✅ Passed	The description is comprehensive and directly related to the changeset, explaining the problem, verification, scope, and test plan.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch desktops-add-alsa-ucm-conf

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