Hi Cengiz,
I've now installed Ubuntu 25.04 with kernel 6.17.0-8-generic and tested
the suggested fix. Unfortunately, the internal speakers still do not
produce any sound.
System Information:
- OS: Ubuntu 25.04
- Kernel: 6.17.0-8-generic
- Device: Acer Aspire Switch 12 S (SW7-272)
- Codec: Realtek ALC255, Subsystem ID 0x10251049
What was tested:
1. Applied the suggested kernel parameter:
snd_hda_intel.model=alc255-acer-headphone-and-mic
1. The fixup was confirmed applied in dmesg:
snd_hda_codec_alc269 hdaudioC0D0: ALC255: picked fixup
alc255-acer-headphone-and-mic (model specified)
snd_hda_codec_alc269 hdaudioC0D0: autoconfig for ALC255: line_outs=1
(0x1b/0x0/0x0/0x0/0x0) type:speaker
2. Forced legacy HDA driver instead of AVS:
By default, kernel 6.17 uses the AVS (Audio Voice Speech) driver on this
device. I added snd_intel_dspcfg.dsp_driver=1 to force the legacy HDA-Intel
driver, which is required for the model parameter to take effect.
3. Enabled codec GPIOs:
All three codec GPIOs were enabled and set high using hda-verb:
IO[0]: enable=1, dir=1, data=1
IO[1]: enable=1, dir=1, data=1
IO[2]: enable=1, dir=1, data=1
4. Set COEF 0x0d speaker amp bits (0x6000)
5. Verified mixer settings:
- Master: 85%, unmuted
- Speaker: 100%, unmuted
- Speaker Phantom Jack: on
Results: None of the above resulted in audio output from the internal
speakers. Headphones continue to work correctly via the 3.5mm jack.
Additional investigation:
- Examined DSDT and all 10 SSDTs - no speaker-related GPIO definitions found
- Scanned I2C buses 0-2 for external amplifier chips - none detected
- Examined EC (Embedded Controller) memory region - no obvious speaker enable
field
Conclusion: The speaker amplifier on this device appears to require a
platform GPIO or EC command that is not exposed via standard ACPI
interfaces. The Windows driver likely uses a proprietary mechanism to
enable the amplifier that Linux does not currently implement.
This is not a configuration issue that can be solved with existing
kernel fixups. It may require reverse-engineering the Windows audio
driver to determine how it enables the speaker amplifier.
I'm happy to provide any additional diagnostic information (full
DSDT/SSDT dumps, alsa-info output, etc.) that would help investigate
this further.
Thank you
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https://bugs.launchpad.net/bugs/2138285
Title:
[Acer Aspire SW7-272] Internal speakers not working - ALC255 codec
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