Public bug reported:
## Summary
Internal speakers stopped working on a Lenovo Legion 7 16ITHg6 (machine
type 82K6) after a kernel update within Ubuntu 26.04. The machine has a
Realtek ALC287 HDA codec plus two Cirrus Logic CS35L41 amplifiers on I2C
driving the internal speakers.
This is a **regression**, and the cause is a single added quirk table
entry.
- Last known good: 7.0.0-22-generic
- First known bad: 7.0.0-27-generic
- Still broken in: 7.0.0-28-generic, 7.0.0-29-generic (current)
Headphone jack, Bluetooth, HDMI audio and the internal microphone all
work fine. Speakers work correctly under Windows on the same machine
(dual boot).
## Hardware
- Model: LENOVO 82K6 — Legion 7 16ITHg6
- BIOS: H1CN58WW, 04/11/2024
- HDA controller: 00:1f.3 Intel Tiger Lake-H HD Audio [8086:43c8] rev 11
- **PCI subsystem ID: 17aa:3811**
- HDA codec: Realtek ALC287, vendor id 0x10ec0287
- **Codec subsystem ID: 0x17aa3855**
- Amplifiers: 2x Cirrus Logic CS35L41 (35a40) Revision B2, I2C, ACPI id CLSA0101
Note that the PCI subsystem ID and the codec subsystem ID differ. This is the
crux
of the bug.
## Symptom
On the broken kernel the wrong fixup is applied and the CS35L41
amplifiers never load their DSP firmware:
```
cs35l41-hda i2c-CLSA0101:00-cs35l41-hda.0: Using extra _DSD properties,
bypassing _DSD in ACPI
cs35l41-hda i2c-CLSA0101:00-cs35l41-hda.0: Cirrus Logic CS35L41 (35a40),
Revision: B2
cs35l41-hda i2c-CLSA0101:00-cs35l41-hda.1: Using extra _DSD properties,
bypassing _DSD in ACPI
cs35l41-hda i2c-CLSA0101:00-cs35l41-hda.1: Reset line busy, assuming shared
reset
snd_hda_codec_alc269 hdaudioC0D0: ALC287: picked fixup for PCI SSID 17aa:3811
snd_hda_codec_alc269 hdaudioC0D0: autoconfig for ALC287: line_outs=1
(0x17/0x0/0x0/0x0/0x0) type:speaker
snd_hda_codec_alc269 hdaudioC0D0: speaker_outs=0 (0x0/0x0/0x0/0x0/0x0)
snd_hda_codec_alc269 hdaudioC0D0: hp_outs=1 (0x21/0x0/0x0/0x0/0x0)
cs35l41-hda i2c-CLSA0101:00-cs35l41-hda.1: Cirrus Logic CS35L41 (35a40),
Revision: B2
```
Both amplifiers are probed, but there is no `DSP1` firmware line at all
and the speakers stay completely silent.
On 7.0.0-22-generic the same machine logged `picked fixup for codec SSID
17aa:3855` and proceeded to load `cirrus/cs35l41-dsp1-spk-
prot-17aa3855.wmfw`, and the speakers worked.
(The fixup name in the message above is blank because the Ubuntu kernel is
built without `CONFIG_SND_DEBUG_VERBOSE`, so `SND_PCI_QUIRK` drops the `.name`
field.
This is expected and is not itself the problem.)
## Root cause
I compared the ALC269 quirk table between the last-good and the current module,
by extracting `snd-hda-codec-alc269.ko` from both packages and decoding the
`struct snd_pci_quirk` entries directly (12-byte stride, no `.name` pointer,
consistent with `CONFIG_SND_DEBUG_VERBOSE` being off).
Across the entire `0x17aa` vendor range there is exactly one difference:
| Subdevice | 7.0.0-22 (good) | 7.0.0-29 (bad) |
|---|---|---|
| `17aa:3811` | **absent** | **fixup id 254 (added)** |
| `17aa:3813` | fixup id 254 | fixup id 254 |
| `17aa:3855` | fixup id 277 | fixup id 279 |
- Exactly one entry was added (`17aa:3811`); none were removed.
- `17aa:3855` is still present and correct — the numeric id shift from 277 to
279 is just enum renumbering from unrelated fixups added in between.
- The new `17aa:3811` entry points at the same fixup as `17aa:3813`, i.e. the
Legion 16ACHg6 family fixup.
`snd_hda_pick_fixup()` matches the **PCI SSID before the codec SSID**. On this
machine the PCI SSID is `17aa:3811` and the codec SSID is `17aa:3855`, so the
newly added PCI-SSID entry now shadows the correct, still-present codec-SSID
quirk for the 16ITHg6. The 16ACHg6 fixup that gets applied instead does not
bind the CS35L41
amplifiers over I2C, hence the silence.
In other words: the Legion 7 16ITHg6 (Intel, 82K6) and the Legion 16ACHg6 (AMD)
apparently share the PCI subsystem ID `17aa:3811`, and are only distinguishable
by
their codec subsystem ID.
## Suggested fix
Any of these would work; the second seems safest:
1. Give the codec SSID precedence over the PCI SSID in `snd_hda_pick_fixup()`.
Correct in principle but a core HDA change that could affect other machines.
2. **Drop or narrow the `17aa:3811` PCI-SSID quirk and match the 16ACHg6 by its
codec SSID instead**, since `17aa:3811` demonstrably collides between two
different machines that need different fixups.
3. Add a DMI match to disambiguate the two models.
## Not the cause
Ruled out during diagnosis:
- Missing firmware — `/lib/firmware/cirrus/` contains
`cs35l41-dsp1-spk-prot-17aa3855.wmfw.zst` and all four
`cs35l41-dsp1-spk-prot-17aa3855-spkid{0,1}-{l,r}0.bin.zst`.
- Muted mixers — all controls unmuted, `speaker-test` on `hw:0,0` runs without
error.
- PipeWire / userspace — the failure is visible at the kernel log level.
- Local configuration — there are no `snd`/`model=` overrides in
`/etc/modprobe.d/`.
## Workaround
None available to users via `model=`. The relevant fixups
(`ALC287_FIXUP_LEGION_16ITHG6` / `ALC287_FIXUP_CS35L41_I2C_2`) have no
entry in `alc269_fixup_models[]`, so they cannot be forced from
`/etc/modprobe.d/`. The only known workaround is booting
7.0.0-22-generic.
ProblemType: Bug
DistroRelease: Ubuntu 26.04
Package: linux-image-7.0.0-29-generic 7.0.0-29.29
ProcVersionSignature: Ubuntu 7.0.0-29.29-generic 7.0.12
Uname: Linux 7.0.0-29-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.34.1-0ubuntu0.1
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: alesitom 6633 F.... wireplumber
/dev/snd/controlC1: alesitom 6633 F.... wireplumber
/dev/snd/seq: alesitom 6613 F.... pipewire
CasperMD5CheckResult: pass
CurrentDesktop: ubuntu:GNOME
Date: Mon Aug 10 09:51:43 2026
InstallationDate: Installed on 2026-05-05 (97 days ago)
InstallationMedia: Ubuntu 26.04 "Resolute Raccoon" - Release amd64 (20260423.1)
MachineType: LENOVO 82K6
ProcEnviron:
LANG=en_US.UTF-8
PATH=(custom, no user)
SHELL=/bin/bash
TERM=xterm-ghostty
XDG_RUNTIME_DIR=<set>
ProcFB: 0 i915drmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-7.0.0-29-generic
root=/dev/mapper/ubuntu--vg-ubuntu--lv ro quiet splash
crashkernel=2G-4G:320M,4G-32G:512M,32G-64G:1024M,64G-128G:2048M,128G-:4096M
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 04/11/2024
dmi.bios.release: 1.58
dmi.bios.vendor: LENOVO
dmi.bios.version: H1CN58WW
dmi.board.asset.tag: NO Asset Tag
dmi.board.name: LNVNB161216
dmi.board.vendor: LENOVO
dmi.board.version: SDK0T76461 WIN
dmi.chassis.asset.tag: NO Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Legion 7 16ITHg6
dmi.ec.firmware.release: 1.58
dmi.modalias:
dmi:bvnLENOVO:bvrH1CN58WW:bd04/11/2024:br1.58:efr1.58:svnLENOVO:pn82K6:pvrLegion716ITHg6:rvnLENOVO:rnLNVNB161216:rvrSDK0T76461WIN:cvnLENOVO:ct10:cvrLegion716ITHg6:skuLENOVO_MT_82K6_BU_idea_FM_Legion716ITHg6:pfaLegion716ITHg6:
dmi.product.family: Legion 7 16ITHg6
dmi.product.name: 82K6
dmi.product.sku: LENOVO_MT_82K6_BU_idea_FM_Legion 7 16ITHg6
dmi.product.version: Legion 7 16ITHg6
dmi.sys.vendor: LENOVO
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug resolute wayland-session
** Attachment added: "Alsa info & debug"
https://bugs.launchpad.net/bugs/2163143/+attachment/5990940/+files/alsa-reports.zip
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https://bugs.launchpad.net/bugs/2163143
Title:
[Lenovo Legion 7 16ITHg6 82K6, Realtek ALC287 + 2x CS35L41]
Regression: internal speakers silent since 7.0.0-27; new PCI SSID
quirk 17aa:3811 shadows codec SSID quirk 17aa:3855
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