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Created July 16, 2026 15:17
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ROG Flow Z13 2025 Audio fix
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z13-audio-fix-summary.md

ROG Flow Z13 2025 Audio fix

ROG Flow Z13 2025 (ai max 395) Audio Fix

Disclaimer: I don't know much about kernel development, this fix was figured out with AI assistance.
My problem was that the speakers work but are way quieter than Windows. Kernel logs show:

cs35l41-hda: Falling back to default firmware.

The fix is simple: copy-paste the ROG Ally entry with a different device ID. It solves the audio problem subjectively (we're far from amazing sound, but at least twice as loud).

The Z13 2025 subsystem ID (10431FB3) is missing from cs35l41_hda_property.c. The Realtek quirk was added in 6.18, but the CS35L41 entry is still missing in 6.19-rc3 as far as I can tell.

File: sound/hda/codecs/side-codecs/cs35l41_hda_property.c

Add to cs35l41_config_table[] (right after the ROG Ally 104317F3 entry):

{ "10431FB3", 2, INTERNAL, { CS35L41_LEFT, CS35L41_RIGHT, 0, 0 }, 0, 1, -1, 1000, 4500, 24 },

Add to cs35l41_prop_model_table[]:

{ "CSC3551", "10431FB3", generic_dsd_config },

Same values as ROG Ally except the device identifier for rog flow z13.

Before:

cs35l41-hda: Falling back to default firmware.

After:

cs35l41-hda: Adding DSD properties for 10431FB3
cs35l41-hda: DSP1: cirrus/cs35l41-dsp1-spk-prot-10431fb3.wmfw
cs35l41-hda: DSP1: spk-prot: ...\10431FB3_241018_V01_A0
cs35l41-hda: Calibration applied: R0=7052

Also needed: Firmware Symlinks

SPKID detection fails (SPKID: -19), so also needed:

cd /lib/firmware/cirrus
ln -sf cs35l41-dsp1-spk-prot-10431fb3-spkid0-l0.bin.zst cs35l41-dsp1-spk-prot-10431fb3-l0.bin.zst
ln -sf cs35l41-dsp1-spk-prot-10431fb3-spkid0-r0.bin.zst cs35l41-dsp1-spk-prot-10431fb3-r0.bin.zst

Optional

You can also tweak gain at runtime with bincfg symlinks (available: 14_5dB, 16_5dB, 19_5dB):

cd /lib/firmware/cirrus
sudo ln -sf cs35l41/bincfgs/cs35l41-dsp1-19_5dB.bincfg.zst cs35l41-dsp1-spk-prot-10431fb3-l0.bincfg.zst
sudo ln -sf cs35l41/bincfgs/cs35l41-dsp1-19_5dB.bincfg.zst cs35l41-dsp1-spk-prot-10431fb3-r0.bincfg.zst
# reload: sudo rmmod snd_hda_scodec_cs35l41_i2c snd_hda_scodec_cs35l41 && sudo modprobe snd_hda_scodec_cs35l41_i2c

I measured with an iPhone SPL meter app playing the same Spotify track:

  • 19_5dB → 76.5 dB (Gain: 19 in journalctl)
  • 16_5dB → 74.1 dB (Gain: 16 in journalctl)
  • no bincfg → default Gain: 17

Links

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