Public bug reported:
Hardware:
- Laptop: Samsung Galaxy Book6 Pro (device ID C910)
- Audio architecture: Intel SoundWire (SST), with one Cirrus CS42L45
companion codec and TWO Cirrus CS35L57 smart amplifiers
(SoundWire links: LW = l1u0, RW = l2u1)
- Windows/Samsung hardware ID: 144D:C910 -> Linux firmware SSID: 144dc910
Environment:
- Ubuntu 26.10 (development / "Stonking Stingray") tested from the
live USB session, all default settings
- Kernel: [FILL IN from log section 1]
- linux-firmware-misc: [FILL IN from log section 2]
Symptoms:
- Internal speakers sound flat, lack bass entirely, and get scratchy /
rattling at moderate volume
- The sound is NOT broken in Windows (Samsung applies Dolby Atmos +
amp/DSP processing there)
- Headphones are fine
- This reproduces on a clean live USB with zero changes made
- Installing the packaged amp firmware
(cs35l57-b2-dsp1-misc-144dc910.{wmfw,l1u0.bin,l2u1.bin},
shipped in linux-firmware-misc 20260915) did NOT change the sound
What I already verified:
- The correct per-SSID amp firmware IS present at
/usr/lib/firmware/cirrus/ (confirmed by ls -la, see attached log)
- Firmware being present does not fix the symptoms, so this appears to
be a board-enablement issue (SOF topology / sof_sdw quirk / UCM
routing) rather than missing firmware files
- sound/soc/intel/boards/sof_sdw.c has no Samsung DMI/SSID entry for
this machine, and no matching SOF topology or UCM profile appears to
exist
Diagnostic evidence:
- I am attaching the Windows Samsung audio driver INF
(xucsmeext_c910.inf, from the Windows DriverStore). It is direct
evidence from Samsung's own driver of the exact hardware:
CS35L57 x2 (SoundWire links l1u0 = left woofer, l2u1 = right
woofer) + CS42L45 codec, Windows hardware ID 144D:C910.
- I will attach the full Linux diagnostic log
(galaxybook6-audio-diagnostic.log) as soon as I can boot the live
USB again - happy to add it now if needed, just ask.
Expected behavior:
- Internal speaker output at least comparable in quality to Windows
(bass present, no scratchiness). Someone with access to a Book6 Pro
confirming this would be great, and I'm happy to test any patches,
topologies, or UCM profiles.
How to reproduce:
1. Boot any recent Ubuntu from a live USB on a Galaxy Book6 Pro (C910)
2. Play any music with bass, or the tone test in the attached script
3. Observe flat, bass-less, scratchy sound from the internal speakers
4. Repeat with headphones connected: sound is fine
Not affected / works:
- Headphones and headset: fine
- Windows (Dolby Atmos + Samsung processing): fine
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Attachment added: "Samsung's driver file"
https://bugs.launchpad.net/bugs/2170576/+attachment/6008461/+files/XuCsMeExt_C910.inf
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https://bugs.launchpad.net/bugs/2170576
Title:
Internal speakers sound broken (flat, no bass, scratchy/rattling) on
Samsung Galaxy Book6 Pro - CS42L45 + 2x CS35L57 SoundWire (SSID
144dc910)
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