Xiaomi Book Air 13 (2022) – only 2 internal speakers active, generic sof-hda-generic-2ch topology loaded

[galise2play]

I am running Fedora Linux on a Xiaomi Book Air 13 (2022, Intel platform).
The internal audio partially works: only the front tweeters are active.
The side speakers (mid/bass) are completely silent.

This appears to be due to a generic SOF topology being loaded instead of a vendor-specific one.

Hardware

• Laptop: Xiaomi Book Air 13 (2022)
• CPU: Intel (Tiger Lake / Alder Lake class)
• Audio codec: Conexant CX11970
• Kernel: 6.17.x

Evidence

aplay -l

card 0: sof-hda-dsp
device 0: HDA Analog

**Relevant dmesg output**
Topology file: intel/sof-tplg/sof-hda-generic-2ch.tplg
snd_hda_codec_conexant CX11970
line_outs=1
speaker_outs=0

**Analysis**
SOF firmware loads correctly, but only a generic 2-channel topology is used.
The codec reports a single speaker output.
This suggests that additional internal speakers are driven by a DSP/Smart Amp
that requires a vendor-specific topology not currently available in SOF.

This is not a regression: full speaker support has never worked on this device under Linux.

**Question**

Is there any existing or planned SOF topology for this Xiaomi model?
If not, is there a recommended path (DSDT dump, NHLT extraction, Windows driver analysis)
to help enable full speaker support?

[ujfalusi]

The 2ch in the topology name refers to the Digital Microphone (DMIC) channels, in your case you have stereo DMIC in the device, this triggers the use of SOF as DMIC needs DSP to work.

You can force the legacy HDA stack to be used by adding

options snd_intel_dspcfg dsp_driver=1

to /etc/modprobe.d/force-legacy-hda.conf file and reboot. You will loose the onboard microphones, but you can verify that the speakers will behave the same way as with SOF.

There are fixups for other Laptops with Conexant codec in sound/hda/codecs/conexant.c, but I don't see any Xiaomi devices in the list.

If the speakers behave the same way in legacy mode, then it is either Conexant or Xiaomi who can provide the needed fixup for the laptop.