[BUG] MSI Stealth 16 AI+ B3WH (Panther Lake): speakers silent — no SoundWire machine match (2× RT1320 on link2 + RT713 on link3), missing rt1320 DSP firmware

[aosceola56]

No sound from internal speakers on MSI Stealth 16 AI+ B3WH. Card enumerates,
PipeWire/WirePlumber route streams to the Speaker sink, all mixer gains/switches
correct, speaker-test runs without errors — but zero acoustic output.

Two problems found:

1. No SoundWire machine driver match for this codec layout

sof-audio-pci-intel-ptl 0000:00:1f.3: No SoundWire machine driver found for the ACPI-reported configuration:
link 2 mfg_id 0x025d part_id 0x1320 version 0x3
link 2 mfg_id 0x025d part_id 0x1320 version 0x3
link 3 mfg_id 0x025d part_id 0x0713 version 0x3
Use SoundWire default machine driver with function topologies

Both RT1320 amps share link 2, RT713 jack codec on link 3. Existing
ptl_sdw_rt713_vb_l3_rt1320_l12 entry expects RT1320 on links 1+2, so no match.
Falls back to generic sof-sdca-1amp-id2.tplg (1 amp, this machine has 2 amps
driving 2 speakers + 2 woofers).

2. RT1320 DSP firmware missing from linux-firmware

Toggling the 'DSP FW Update' mixer switch triggers:

rt1320-sdca sdw:0:2:025d:1320:01:0: Direct firmware load for
    realtek/rt1320/rt1320_Micro-Star_Stealth_2631.1.dat failed with error -2
rt1320_dspfw_load_code: Failed to load firmware

linux-firmware (20260810) only ships generic rt1320-patch-code-v{ab,c}.bin,
no product-specific .dat (also rt1320_RAE_Micro-Star_Stealth_2631.1.dat
presumably needed for RAE). Driver has no fallback, so the amp DSP never runs.
Speakers work under Windows, where this tuning ships in the Realtek driver.

Environment

• DMI: Micro-Star International Co., Ltd. Stealth 16 AI+ B3WH/MS-2631, REV:1.0, SKU 2631.1, BIOS E2631IMS.10F 04/09/2026
• Distro: Arch Linux
• Kernel: 7.1.8-zen1-3-zen
• linux-firmware: 20260810-2
• alsa-ucm-conf: 1.2.16.1-1, pipewire 1.6.8, wireplumber 0.5.15
• SOF firmware booted: 2.14.1.1
• Audio PCI: 8086:e328 Intel Core Ultra Series 3 (Panther Lake) HD Audio

What was tried

• Verified PipeWire routing: stream actively linked to Speaker:playback_FL/FR
• Verified ALSA mixer: Speaker Switch on, rt1320-1/2 FU21 at 100%, Post/Pre Mixer
  Speaker at 100%, RX Channel Select sane (L,L / R,R)
• Triggered 'rt1320-1/2 R0 Calibration' — switches fire and auto-clear, no sound
• Forced disable_function_topology=1 tplg_filename=sof-ptl-rt713-l3-rt1320-l2.tplg
  → RT713 bus writes fail (trf on Slave 6 failed), card probe fails entirely,
  reverted
• Triggered 'DSP FW Update' → missing rt1320_Micro-Star_Stealth_2631.1.dat (above)

Request

1. Add match-table entry for rt713-l3 + dual-rt1320-on-link2 (likely needs a
   2-amp SDCA function topology on link 2, and possibly dropping machine_check
   if this BIOS lacks the SMART_MIC function — same issue as the LG Gram 16Z90U
   quirk in May 2026)
2. Help route the firmware request: MSI/Realtek need to submit
   rt1320_Micro-Star_Stealth_2631.1.dat (+RAE) to linux-firmware, or advise
   on extracting from the Windows driver as a workaround

dmesg.txt

alsa-info.txt.gt3pelhqYM.txt