Samsung Galaxy Book5 Pro 14 (940XHA) - Speakers not working

[muk8700-dotcom]

Hi, I have the same issue on a Samsung Galaxy Book5 Pro 14 (940XHA) — internal speakers completely silent, headphones work fine.
∙ Model: 940XHA (Galaxy Book5 Pro 14)
∙ Codec: Realtek ALC298
∙ Subsystem ID: 0x144dca08
∙ Audio driver: Intel Lunar Lake (sof-audio-pci-intel-lnl)
∙ Amps: 4x MAX98390 on i2c-2 (addresses 0x38, 0x39, 0x3c, 0x3d)
∙ Kernel: 6.17.0-19-generic
∙ Distro: Zorin OS 18 (Ubuntu-based)
ACPI only binds the amp at 0x38. Manually binding the other three shows all four responding with revisionID: 0x42, but still no audio output. The DKMS fix from Andycodeman’s repo also failed silently on my system.
Happy to test and provide more info!

[lgirdwood]

It sounds like it could be a combination of

1. the amps: 4x MAX98390 on i2c-2 (addresses 0x38, 0x39, 0x3c, 0x3d) may need some additional programming to enable their outputs.
2. the maxim codec output is good for HP, but the codec output for the amps may be on different codec pins and this may need some alsamixer changes and/or codec driver updates.

First step I would probably do is use the DKMS fix and then try and modify alsamixer with audio playing to see if the other codec outputs can be enabled before going down the route of checking datasheets.