* Add UCM2 profile for Lenovo Yoga Slim 7 15ITL05 (ALC287, subsystem 17aa:380a)
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@ 2026-06-08 12:22 ` GitHub issues - opened
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From: GitHub issues - opened @ 2026-06-08 12:22 UTC (permalink / raw)
To: alsa-devel
alsa-project/alsa-ucm-conf issue #782 was opened from Ab0lish:
Lenovo Yoga Slim 7 15ITL05, sof-hda-dsp, dual-DAC issue (node 0x17 receiving both DAC1+DAC2 with no crossover)
Hardware: Lenovo Yoga Slim 7 15ITL05
Codec: Realtek ALC287, subsystem ID 0x17aa380a
Driver: sof-hda-dsp (sof-firmware)
Kernel: 6.12 (Debian 13)
Problem:
Speakers sound hollow and metallic. No UCM2 profile exists for this hardware so the generic HDA profile is used.
Root cause identified:
The codec has two DACs and two speaker pin groups (quad-speaker, Dolby Atmos):
- Node 0x14 (bass/woofers): connected to DAC2 (0x02) only ✓
- Node 0x17 (tweeters): connected to BOTH DAC1 (0x03) and DAC2 (0x02) ✗
Both DACs receive the same full-range signal with no crossover filtering, causing acoustic phase interference between the tweeter and woofer pairs. On Windows, the Dolby Atmos driver applies a crossover inside the SOF DSP.
Expected behaviour:
- Node 0x17 (tweeters, DefAssociation=0x1 Sequence=0x0) → DAC1 only
- Node 0x14 (woofers, DefAssociation=0x1 Sequence=0x1) → DAC2 only
Codec dump attached.
[alc287-yoga-slim7-codec-dump.txt](https://github.com/user-attachments/files/28707118/alc287-yoga-slim7-codec-dump.txt)
Issue URL : https://github.com/alsa-project/alsa-ucm-conf/issues/782
Repository URL: https://github.com/alsa-project/alsa-ucm-conf
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