Thanks - apport-collect is done, so all the collected data should be attached now.
Reading the collected CurrentDmesg, two things may be useful. 1) The amp firmware is loading fine, so this isn't a missing-firmware problem: cs35l56 sdw:0:1:...: DSP1: cirrus/cs35l57-b2-dsp1-misc-144dc910.wmfw: ... v4.7.0, 42 algorithms cs35l56 sdw:0:1:...: DSP1: cirrus/cs35l57-b2-dsp1-misc-144dc910-l1u0.bin (v1): v4.7.0 cs35l56 sdw:0:2:...: DSP1: cirrus/cs35l57-b2-dsp1-misc-144dc910-l2u1.bin (v1): v4.7.0 cs35l56 sdw:0:1 / 0:2: Calibration applied (Tuning PID/SID/TID all 0x0) 2) There is no board-specific SoundWire machine driver match, so it falls back to the generic one: sof-audio-pci-intel-ptl 0000:00:1f.3: No SoundWire machine driver found for the ACPI-reported configuration: link 1 mfg_id 0x01fa part_id 0x3557 version 0x3 (CS35L57) link 2 mfg_id 0x01fa part_id 0x3557 version 0x3 (CS35L57) link 3 mfg_id 0x01fa part_id 0x4245 version 0x3 (CS42L45) Use SoundWire default machine driver with function topologies loading topology 0: intel/sof-ipc4-tplg/sof-sdca-2amp-id2.tplg ... Topology: ABI 3:29:1 Kernel ABI 3:23:1 3) Most interesting: a UBSAN warning appears at the moment audio playback starts: UBSAN: shift-out-of-bounds in /build/linux-7VAWC7/linux-7.3.0/sound/soc/sof/ipc4-topology.c:2471:13 _sof_ipc4_prepare_copier_module.cold sof_ipc4_prepare_copier_module sof_pcm_hw_params That shift-out-of-bounds in the IPC4 topology copier preparation looks like a genuine bug and a plausible cause of the distorted/scratchy output. Is that the right thing to chase? I'm happy to reproduce it and capture more (e.g. run `speaker-test` while capturing dmesg), or test any patched kernel/topology/UCM if that would help. Also worth noting: I first saw this from the 26.10 live USB, but I got the same result from an actual Ubuntu 26.10 installation, so it is not specific to the live session. Thank you! -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. 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) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2170576/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
