No sound from internal speakers on Acer Aspire AL16-31P (Realtek ALC269VC, likely amp issue)

[GitHub issues - opened <github@alsa-project.org>]

alsa-project/alsa-lib issue #500 was opened from nicolas2019alcubo:

Laptop: Acer Aspire AL16-31P
CPU: Intel Alder Lake
Audio codec: Realtek ALC269VC
Audio controller: HDA Intel PCH

Problem:
Internal speakers produce no sound on Linux. Audio system appears functional but output is silent.

Tested distributions:
- Fedora 43 (kernel 6.17.1)
- Ubuntu 25.10
- EndeavourOS (Arch-based)

Observed behavior:
- Speakers detected as "Built-in Audio"
- Audio plays (no errors), but no sound is heard
- Headphones and HDMI output work (if tested, confirm)
- pactl shows sink in SUSPENDED or IDLE state
- alsamixer shows normal levels

Diagnostics:
aplay -l shows:
card 0: PCH [HDA Intel PCH], device 0: ALC269VC Analog

Manual test:
aplay -D plughw:0,0 /usr/share/sounds/alsa/Front_Center.wav
→ no sound output

Attempted fixes:
- Disabled Auto-Mute Mode
- Forced analog-stereo profile
- Installed alsa-sof-firmware
- Tested multiple kernels and distros

Conclusion:
Likely missing support or initialization sequence for internal speaker amplifier (smart amp).

Issue URL     : https://github.com/alsa-project/alsa-lib/issues/500
Repository URL: https://github.com/alsa-project/alsa-lib