Public bug reported:
Ubuntu 24.04.4 LTS on an Acer Aspire A14-52MT (Intel Lunar Lake) loses
all physical audio output when booted with the Noble HWE kernel
`7.0.0-28-generic`.
The audio devices are enumerated normally. PipeWire and WirePlumber are
running, the correct sinks can be selected, volumes are non-zero and
unmuted, the HDMI ELD is valid, and ALSA playback reaches the `RUNNING`
state. Nevertheless, HDMI, the internal speakers, and headphones
connected to the laptop's 3.5 mm jack remain silent.
Booting the same installation with `6.17.0-40-generic` immediately
restores audio without any configuration or hardware changes.
### Hardware and software
- Laptop: Acer Aspire A14-52MT
- BIOS: V1.02, 2025-01-06
- Audio controller: Intel Lunar Lake-M HD Audio Controller `[8086:a828]`
- Graphics controller used for HDMI: Intel Lunar Lake `[8086:64a0]`, `xe` driver
- Audio driver: `sof-audio-pci-intel-lnl`
- Analog codec: Realtek ALC245
- Ubuntu: 24.04.4 LTS (Noble)
- Bad kernel: `7.0.0-28-generic` (`7.0.0-28.28~24.04.1`)
- Good kernel: `6.17.0-40-generic` (`6.17.0-40.40~24.04.1`)
- SOF firmware: `2.14.1.1`
- Topology: `intel/sof-ipc4-tplg/sof-hda-generic-2ch.tplg`
### Steps to reproduce
1. Boot Ubuntu with `7.0.0-28-generic`.
2. Select `sof-hda-dsp Speaker + Headphones` or the HDMI output.
3. Play normal desktop audio or run:
`speaker-test -D hw:0,0 -c 2 -r 48000 -F S16_LE -t wav -l 1`
For HDMI:
`speaker-test -D hw:0,3 -c 2 -r 48000 -F S16_LE -t wav -l 1`
4. Observe that playback completes without an ALSA error but no sound is heard.
5. Reboot into `6.17.0-40-generic` and repeat the test.
6. Audio works normally.
### Expected result
Audio is audible from the selected HDMI or analog output with
`7.0.0-28-generic`, as it is with `6.17.0-40-generic`.
### Actual result
All physical audio outputs are silent with `7.0.0-28-generic`.
### Diagnostic observations
- `wpctl status` exposes all expected sinks on both kernels.
- The HDMI monitor is detected with a valid ELD and stereo LPCM support.
- `Master`, `Headphone`, `Speaker`, and the relevant IEC958 playback switches
are enabled.
- Direct ALSA tests and PipeWire-targeted tests are both silent on 7.0.
- The same installed SOF firmware, topology, ALSA UCM configuration, monitor,
cable, and user-space audio stack are used on both boots.
- The kernel initialization logs do not show an obvious audio error and are
nearly identical, making the good/bad kernel comparison important.
- Reproducibility: 100% in the tested boots.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: noble regression-update
** Attachment added: "audio-kernel-regression-sanitized.log"
https://bugs.launchpad.net/bugs/2161970/+attachment/5987349/+files/audio-kernel-regression-sanitized.log
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https://bugs.launchpad.net/bugs/2161970
Title:
[regression] Acer Aspire A14-52MT has no audio on HDMI, speakers, or
3.5 mm jack with 7.0.0-28; 6.17.0-40 works
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