no sound on Asus ExpertBook B9406CAA since kernel 7.1

On kernel 7.0 (with latest alsa ucm configs, linux-firmware etc.) it works fine (besides the mute LED always being on on the keyboard).

q66@asusbook: /home/q66$ doas dmesg|grep -i sdw
doas (q66@asusbook) password: 
[    9.217471] cs42l43 sdw:0:3:01fa:4243:01: supply vdd-p not found, using dummy regulator
[    9.217528] cs42l43 sdw:0:3:01fa:4243:01: supply vdd-d not found, using dummy regulator
[    9.217551] cs42l43 sdw:0:3:01fa:4243:01: supply vdd-a not found, using dummy regulator
[    9.217570] cs42l43 sdw:0:3:01fa:4243:01: supply vdd-io not found, using dummy regulator
[    9.217581] cs42l43 sdw:0:3:01fa:4243:01: supply vdd-cp not found, using dummy regulator
[    9.221957] cs42l43 sdw:0:3:01fa:4243:01: devid: 0x042a43, rev: 0xa1, otp: 0x03
[    9.249866] cs35l56 sdw:0:2:01fa:3556:01:0: supply VDD_P not found, using dummy regulator
[    9.249931] cs35l56 sdw:0:2:01fa:3556:01:0: supply VDD_IO not found, using dummy regulator
[    9.249942] cs35l56 sdw:0:2:01fa:3556:01:0: supply VDD_A not found, using dummy regulator
[    9.257771] cs35l56 sdw:0:2:01fa:3556:01:0: Cirrus Logic CS35L56 Rev B0 OTP3 fw:3.4.4 (patched=0)
[    9.262161] cs35l56 sdw:0:2:01fa:3556:01:1: supply VDD_P not found, using dummy regulator
[    9.262196] cs35l56 sdw:0:2:01fa:3556:01:1: supply VDD_IO not found, using dummy regulator
[    9.262204] cs35l56 sdw:0:2:01fa:3556:01:1: supply VDD_A not found, using dummy regulator
[    9.269771] cs35l56 sdw:0:2:01fa:3556:01:1: Cirrus Logic CS35L56 Rev B0 OTP3 fw:3.4.4 (patched=0)
[    9.270468] Adding alias for supply vdd-amp,(null) -> vdd-amp,sdw:0:3:01fa:4243:01
[    9.558345] sof_sdw sof_sdw: ASoC: Parent card not yet available, widget card binding deferred
[    9.558455] cs35l56 sdw:0:2:01fa:3556:01:0: supply VDD_B not found, using dummy regulator
[    9.558471] cs35l56 sdw:0:2:01fa:3556:01:0: supply VDD_AMP not found, using dummy regulator
[    9.560218] cs35l56 sdw:0:2:01fa:3556:01:1: supply VDD_B not found, using dummy regulator
[    9.560229] cs35l56 sdw:0:2:01fa:3556:01:1: supply VDD_AMP not found, using dummy regulator
[    9.564524] cs35l56 sdw:0:2:01fa:3556:01:0: DSP1: cirrus/cs35l56-b0-dsp1-misc-104315e4.wmfw: format 3 timestamp 0x6876b116
[    9.564533] cs35l56 sdw:0:2:01fa:3556:01:0: DSP1: cirrus/cs35l56-b0-dsp1-misc-104315e4.wmfw: Tue 15 Jul 2025 14:50:46 Central Daylight Time
[    9.564703] cs35l56 sdw:0:2:01fa:3556:01:1: DSP1: cirrus/cs35l56-b0-dsp1-misc-104315e4.wmfw: format 3 timestamp 0x6876b116
[    9.564715] cs35l56 sdw:0:2:01fa:3556:01:1: DSP1: cirrus/cs35l56-b0-dsp1-misc-104315e4.wmfw: Tue 15 Jul 2025 14:50:46 Central Daylight Time
[    9.570639] sof_sdw sof_sdw: Setting CS42L43 Speaker volume limit to 128
[   10.546018] cs35l56 sdw:0:2:01fa:3556:01:0: DSP1: Firmware: 1a00d6 vendor: 0x2 v3.13.4, 41 algorithms
[   10.551773] cs35l56 sdw:0:2:01fa:3556:01:1: DSP1: Firmware: 1a00d6 vendor: 0x2 v3.13.4, 41 algorithms
[   10.577411] cs35l56 sdw:0:2:01fa:3556:01:0: DSP1: cirrus/cs35l56-b0-dsp1-misc-104315e4-l2u0.bin (v1): v3.13.4
[   10.577415] cs35l56 sdw:0:2:01fa:3556:01:0: DSP1: Misc: C:\Users\zcai\OneDrive - Cirrus Logic\Desktop\Sub\Project\ASUS\B9406CAA\20251106-Base1023-BSPtest\b0
[   10.605808] cs35l56 sdw:0:2:01fa:3556:01:1: DSP1: cirrus/cs35l56-b0-dsp1-misc-104315e4-l2u1.bin (v1): v3.13.4
[   10.605813] cs35l56 sdw:0:2:01fa:3556:01:1: DSP1: Misc: C:\Users\zcai\OneDrive - Cirrus Logic\Desktop\Sub\Project\ASUS\B9406CAA\20251106-Base1023-BSPtest\b0
[   11.174223] cs35l56 sdw:0:2:01fa:3556:01:1: Calibration applied
[   11.175959] cs35l56 sdw:0:2:01fa:3556:01:1: Tuning PID: 0x23134, SID: 0x470000, TID: 0x84b06
[   11.179848] cs35l56 sdw:0:2:01fa:3556:01:0: Calibration applied
[   11.180833] cs35l56 sdw:0:2:01fa:3556:01:0: Tuning PID: 0x23134, SID: 0x470200, TID: 0x84b06
[   11.181183] sof_sdw sof_sdw: hda_dsp_hdmi_build_controls: no PCM in topology for HDMI converter 3
[   11.195049] input: sof-soundwire Jack as /devices/pci0000:00/0000:00:1f.3/sof_sdw/sound/card0/input18
[   11.195085] input: sof-soundwire HDMI/DP,pcm=5 as /devices/pci0000:00/0000:00:1f.3/sof_sdw/sound/card0/input19
[   11.195107] input: sof-soundwire HDMI/DP,pcm=6 as /devices/pci0000:00/0000:00:1f.3/sof_sdw/sound/card0/input20
[   11.195128] input: sof-soundwire HDMI/DP,pcm=7 as /devices/pci0000:00/0000:00:1f.3/sof_sdw/sound/card0/input21
q66@asusbook: /home/q66$ doas dmesg|grep -i topology
[    9.224654] sof-audio-pci-intel-ptl 0000:00:1f.3:  Topology file:     intel/sof-ipc4-tplg/sof-ptl-cs42l43-agg-l3-cs35l56-l2.tplg
[    9.557531] sof-audio-pci-intel-ptl 0000:00:1f.3: loading topology: intel/sof-ipc4-tplg/sof-ptl-cs42l43-agg-l3-cs35l56-l2.tplg
[    9.557639] sof-audio-pci-intel-ptl 0000:00:1f.3: Topology: ABI 3:29:1 Kernel ABI 3:23:1
[   11.181183] sof_sdw sof_sdw: hda_dsp_hdmi_build_controls: no PCM in topology for HDMI converter 3

on kernel 7.1, the earlier log changes to this, and i get only dummy output and no cards:

q66@asusbook: /home/q66$ doas dmesg|grep -i sdw 
[    8.620810] cs42l43 sdw:0:3:01fa:4243:01: supply vdd-p not found, using dummy regulator
[    8.620868] cs42l43 sdw:0:3:01fa:4243:01: supply vdd-d not found, using dummy regulator
[    8.620881] cs42l43 sdw:0:3:01fa:4243:01: supply vdd-a not found, using dummy regulator
[    8.620891] cs42l43 sdw:0:3:01fa:4243:01: supply vdd-io not found, using dummy regulator
[    8.620912] cs42l43 sdw:0:3:01fa:4243:01: supply vdd-cp not found, using dummy regulator
[    8.623348] cs42l43 sdw:0:3:01fa:4243:01: devid: 0x042a43, rev: 0xa1, otp: 0x03
[    8.650932] cs35l56 sdw:0:2:01fa:3556:01:0: supply VDD_P not found, using dummy regulator
[    8.650990] cs35l56 sdw:0:2:01fa:3556:01:0: supply VDD_IO not found, using dummy regulator
[    8.651000] cs35l56 sdw:0:2:01fa:3556:01:0: supply VDD_A not found, using dummy regulator
[    8.658745] cs35l56 sdw:0:2:01fa:3556:01:0: Cirrus Logic CS35L56 Rev B0 OTP3 fw:3.4.4 (patched=0)
[    8.663124] cs35l56 sdw:0:2:01fa:3556:01:1: supply VDD_P not found, using dummy regulator
[    8.663161] cs35l56 sdw:0:2:01fa:3556:01:1: supply VDD_IO not found, using dummy regulator
[    8.663172] cs35l56 sdw:0:2:01fa:3556:01:1: supply VDD_A not found, using dummy regulator
[    8.671453] cs35l56 sdw:0:2:01fa:3556:01:1: Cirrus Logic CS35L56 Rev B0 OTP3 fw:3.4.4 (patched=0)
[    8.674393] Adding alias for supply vdd-amp,(null) -> vdd-amp,sdw:0:3:01fa:4243:01
[   19.078590] platform sof_sdw: deferred probe pending: sof_sdw: snd_soc_register_card failed -517

any hints?

reverting this pair of patches gets me sound back:

torvalds@45cf24d
torvalds@e0fb794

which is pull request #5773 afaict

q66@asusbook: /home/q66$ uname -a
Linux asusbook 7.1.1-0-generic #1 SMP PREEMPT_DYNAMIC Fri Jun 26 08:25:29 UTC 2026 x86_64
q66@asusbook: /home/q66$ doas dmesg|grep -i sdw  
doas (q66@asusbook) password: 
[    8.590917] cs42l43 sdw:0:3:01fa:4243:01: supply vdd-p not found, using dummy regulator
[    8.590986] cs42l43 sdw:0:3:01fa:4243:01: supply vdd-d not found, using dummy regulator
[    8.591006] cs42l43 sdw:0:3:01fa:4243:01: supply vdd-a not found, using dummy regulator
[    8.591015] cs42l43 sdw:0:3:01fa:4243:01: supply vdd-io not found, using dummy regulator
[    8.591025] cs42l43 sdw:0:3:01fa:4243:01: supply vdd-cp not found, using dummy regulator
[    8.593860] cs42l43 sdw:0:3:01fa:4243:01: devid: 0x042a43, rev: 0xa1, otp: 0x03
[    8.620784] cs35l56 sdw:0:2:01fa:3556:01:0: supply VDD_P not found, using dummy regulator
[    8.620840] cs35l56 sdw:0:2:01fa:3556:01:0: supply VDD_IO not found, using dummy regulator
[    8.620853] cs35l56 sdw:0:2:01fa:3556:01:0: supply VDD_A not found, using dummy regulator
[    8.628664] cs35l56 sdw:0:2:01fa:3556:01:0: Cirrus Logic CS35L56 Rev B0 OTP3 fw:3.4.4 (patched=0)
[    8.632907] cs35l56 sdw:0:2:01fa:3556:01:1: supply VDD_P not found, using dummy regulator
[    8.632950] cs35l56 sdw:0:2:01fa:3556:01:1: supply VDD_IO not found, using dummy regulator
[    8.632964] cs35l56 sdw:0:2:01fa:3556:01:1: supply VDD_A not found, using dummy regulator
[    8.640769] cs35l56 sdw:0:2:01fa:3556:01:1: Cirrus Logic CS35L56 Rev B0 OTP3 fw:3.4.4 (patched=0)
[    8.644544] Adding alias for supply vdd-amp,(null) -> vdd-amp,sdw:0:3:01fa:4243:01
[    8.941825] sof_sdw sof_sdw: ASoC: Parent card not yet available, widget card binding deferred
[    8.942036] cs35l56 sdw:0:2:01fa:3556:01:0: supply VDD_B not found, using dummy regulator
[    8.942055] cs35l56 sdw:0:2:01fa:3556:01:0: supply VDD_AMP not found, using dummy regulator
[    8.944203] cs35l56 sdw:0:2:01fa:3556:01:1: supply VDD_B not found, using dummy regulator
[    8.944229] cs35l56 sdw:0:2:01fa:3556:01:1: supply VDD_AMP not found, using dummy regulator
[    8.952717] cs35l56 sdw:0:2:01fa:3556:01:0: DSP1: cirrus/cs35l56-b0-dsp1-misc-104315e4.wmfw: format 3 timestamp 0x6876b116
[    8.952728] cs35l56 sdw:0:2:01fa:3556:01:0: DSP1: cirrus/cs35l56-b0-dsp1-misc-104315e4.wmfw: Tue 15 Jul 2025 14:50:46 Central Daylight Time
[    8.953403] cs35l56 sdw:0:2:01fa:3556:01:1: DSP1: cirrus/cs35l56-b0-dsp1-misc-104315e4.wmfw: format 3 timestamp 0x6876b116
[    8.953412] cs35l56 sdw:0:2:01fa:3556:01:1: DSP1: cirrus/cs35l56-b0-dsp1-misc-104315e4.wmfw: Tue 15 Jul 2025 14:50:46 Central Daylight Time
[    8.955724] sof_sdw sof_sdw: Setting CS42L43 Speaker volume limit to 128
[    9.945021] cs35l56 sdw:0:2:01fa:3556:01:0: DSP1: Firmware: 1a00d6 vendor: 0x2 v3.13.4, 41 algorithms
[    9.950991] cs35l56 sdw:0:2:01fa:3556:01:1: DSP1: Firmware: 1a00d6 vendor: 0x2 v3.13.4, 41 algorithms
[    9.976790] cs35l56 sdw:0:2:01fa:3556:01:0: DSP1: cirrus/cs35l56-b0-dsp1-misc-104315e4-l2u0.bin (v1): v3.13.4
[    9.976793] cs35l56 sdw:0:2:01fa:3556:01:0: DSP1: Misc: C:\Users\zcai\OneDrive - Cirrus Logic\Desktop\Sub\Project\ASUS\B9406CAA\20251106-Base1023-BSPtest\b0
[   10.005070] cs35l56 sdw:0:2:01fa:3556:01:1: DSP1: cirrus/cs35l56-b0-dsp1-misc-104315e4-l2u1.bin (v1): v3.13.4
[   10.005074] cs35l56 sdw:0:2:01fa:3556:01:1: DSP1: Misc: C:\Users\zcai\OneDrive - Cirrus Logic\Desktop\Sub\Project\ASUS\B9406CAA\20251106-Base1023-BSPtest\b0
[   10.564306] cs35l56 sdw:0:2:01fa:3556:01:0: Calibration applied
[   10.566021] cs35l56 sdw:0:2:01fa:3556:01:0: Tuning PID: 0x23134, SID: 0x470200, TID: 0x84b06
[   10.570928] cs35l56 sdw:0:2:01fa:3556:01:1: Calibration applied
[   10.571892] cs35l56 sdw:0:2:01fa:3556:01:1: Tuning PID: 0x23134, SID: 0x470000, TID: 0x84b06
[   10.572145] sof_sdw sof_sdw: hda_dsp_hdmi_build_controls: no PCM in topology for HDMI converter 3
[   10.586031] input: sof-soundwire Jack as /devices/pci0000:00/0000:00:1f.3/sof_sdw/sound/card0/input18
[   10.586072] input: sof-soundwire HDMI/DP,pcm=5 as /devices/pci0000:00/0000:00:1f.3/sof_sdw/sound/card0/input19
[   10.586095] input: sof-soundwire HDMI/DP,pcm=6 as /devices/pci0000:00/0000:00:1f.3/sof_sdw/sound/card0/input20
[   10.586118] input: sof-soundwire HDMI/DP,pcm=7 as /devices/pci0000:00/0000:00:1f.3/sof_sdw/sound/card0/input21

the following patch itself is enough:

--- a/sound/soc/intel/common/soc-acpi-intel-ptl-match.c
+++ b/sound/soc/intel/common/soc-acpi-intel-ptl-match.c
@@ -514,7 +514,6 @@ struct snd_soc_acpi_mach snd_soc_acpi_intel_ptl_sdw_machines[] = {
 		.link_mask = BIT(2) | BIT(3),
 		.links = ptl_cs42l43_agg_l3_cs35l56_l2,
 		.drv_name = "sof_sdw",
-		.machine_check = snd_soc_acpi_intel_no_function_topology,
 		.sof_tplg_filename = "sof-ptl-cs42l43-agg-l3-cs35l56-l2.tplg",
 	},
 	{

which means the cause is torvalds@e0fb794

Hm... odd, that match shouldn't be required for this device. Could you please provide the full log in the failing case? I don't see any clues in the snippet as to why the machine driver probe deferred.

here is the entire dmesg: https://gist.github.com/q66/706f6d17a1931c223e61d882fba156b5

oddly enough now it's not deferring? now it's just refusing to create a duplicate sysfs entry? not sure about this one

[ 8.519660] sof-audio-pci-intel-ptl 0000:00:1f.3: link 3 mfg_id 0x025d part_id 0x0722 version 0x3

Sigh.. it's another one of these systems with a realtek device in the ACPI that doesn't actually exist. Could you grab the output of:

cat /sys/class/dmi/id/board_name

Fixed better in our downstream: chimera-linux/cports@f0aac5a

This is based on torvalds@4dab2b9 but adds the quirk for my specific laptop. Confirmed working here (currently running the kernel)

Specifically the quirk is

+	{
+		.matches = {
+			DMI_MATCH(DMI_SYS_VENDOR, "ASUS"),
+			DMI_MATCH(DMI_BOARD_NAME, "B9406CAA"),
+		},
+		.driver_data = (void *)ghost_realtek,
+	},

matching

q66@asusbook: /home/q66/cports$ cat /sys/devices/virtual/dmi/id/board_name 
B9406CAA
q66@asusbook: /home/q66/cports$ cat /sys/devices/virtual/dmi/id/sys_vendor 
ASUS

Yeah that is the correct fix. I will send the extra quirk upstream, unless you know if someone from that/your end is going to do so?

yes, please send it

Cool merge window is open right now, but should close at the weekend, so I will send on Monday. Thanks for the help.

the other quirks are currently not in 7.1 stable either, despite the topology switch having happened, so this is probably broken in exactly the same way in 7.1 for the laptops that already have the quirk in torvalds/linux

Thanks yeah should probably make sure that patch is forwarded to stable, I will have a look at that as well. Although most of the other laptops on those quirks had a bunch of other problems so the change wasn't really a regression in those cases as much as it was just an extra reason they didn't work :-)

soundwire: dmi-quirks: Disable ghost Realtek on Asus Expertbook

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no sound on Asus ExpertBook B9406CAA since kernel 7.1 #5828

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no sound on Asus ExpertBook B9406CAA since kernel 7.1 #5828

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q66 commented on Jun 26, 2026

q66 commented on Jun 26, 2026

q66 commented on Jun 26, 2026

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q66 commented on Jun 26, 2026

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q66 commented on Jun 26, 2026

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q66 commented on Jun 26, 2026

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