Dear Maintainer,

My Dell laptop using an "Intel Corporation Lunar Lake-M HD Audio
Controller (rev 10)" audio device has no sound.  pavucontrol shows only
the Dummy device.

My web search found this discussion:
https://bbs.archlinux.org/viewtopic.php?id=310227&p=2
but apparently this regression was never fixed in the Debian kernel.

I'm currently using the kernel and firmware-intel-sound from Trixie backports.

My apologies if this issue should be addressed somewhere else.

Regards
Ralph

 Here are the relevant snippets from dmesg:

...
[   21.973117] sof-audio-pci-intel-lnl 0000:00:1f.3: SoundWire enabled on
CannonLake+ platform, usin
[   21.974427] sof-audio-pci-intel-lnl 0000:00:1f.3: enabling device (0000
-> 0002)
[   21.974531] sof-audio-pci-intel-lnl 0000:00:1f.3: DSP detected with PCI
class/subclass/prog-if 0x
[   21.974597] sof-audio-pci-intel-lnl 0000:00:1f.3: bound 0000:00:02.0
(ops intel_audio_component_b
[   21.982176] sof-audio-pci-intel-lnl 0000:00:1f.3: use msi interrupt mode
[   21.997117] acpi device:20: SDCA function SmartAmp (type 1) at 0x1
[   21.997135] acpi device:21: SDCA function UAJ (type 6) at 0x3
[   21.997153] acpi device:22: SDCA function HID (type 10) at 0x4
[   22.020397] sof-audio-pci-intel-lnl 0000:00:1f.3: hda codecs found, mask
4
[   22.020401] sof-audio-pci-intel-lnl 0000:00:1f.3: NHLT device BT(0)
detected, ssp_mask 0x4
[   22.020403] sof-audio-pci-intel-lnl 0000:00:1f.3: BT link detected in
NHLT tables: 0x4
[   22.020404] sof-audio-pci-intel-lnl 0000:00:1f.3: DMICs detected in NHLT
tables: 0
[   22.023847] sof-audio-pci-intel-lnl 0000:00:1f.3: Firmware paths/files
for ipc type 1:
[   22.023849] sof-audio-pci-intel-lnl 0000:00:1f.3:  Firmware file:
    intel/sof-ipc4/lnl/sof-lnl.
[   22.023850] sof-audio-pci-intel-lnl 0000:00:1f.3:  Firmware lib path:
intel/sof-ipc4-lib/lnl
[   22.023851] sof-audio-pci-intel-lnl 0000:00:1f.3:  Topology file:
    function topologies
[   22.024192] sof-audio-pci-intel-lnl 0000:00:1f.3: Loaded firmware
library: ADSPFW, version: 2.12.
...
[   22.291827] sof-audio-pci-intel-lnl 0000:00:1f.3: firmware: failed to
load intel/sof-ipc4/lnl/sof
[   22.291835] sof-audio-pci-intel-lnl 0000:00:1f.3: firmware: failed to
load intel/sof-ipc4/lnl/sof
[   22.291838] sof-audio-pci-intel-lnl 0000:00:1f.3: firmware: failed to
load intel/sof-ipc4/lnl/sof
[   22.291844] sof-audio-pci-intel-lnl 0000:00:1f.3: firmware: failed to
load intel/sof-ipc4/lnl/sof
[   22.291847] sof-audio-pci-intel-lnl 0000:00:1f.3: firmware: failed to
load intel/sof-ipc4/lnl/sof
[   22.291850] sof-audio-pci-intel-lnl 0000:00:1f.3: firmware: failed to
load intel/sof-ipc4/lnl/sof
[   22.293681] sof-audio-pci-intel-lnl 0000:00:1f.3: Booted firmware
version: 2.12.0.1
...

Regards
Ralph

tomcat:~# dpkg -l | grep ii | grep firmware
ii  firmware-intel-graphics              20260916-1~bpo13+1
       all
ii  firmware-intel-misc                  20260916-1~bpo13+1
       all
ii  firmware-intel-sound                 20260916-1~bpo13+1
       all
ii  firmware-iwlwifi                     20260916-1~bpo13+1
       all
ii  firmware-sof-signed                  2025.01-1
       all
ii  intel-microcode                      3.20251111.1~deb13u1
       amd64

tomcat:~# cat /proc/asound/cards
--- no soundcards ---
tomcat:~# cat /proc/asound/devices
 33:        : timer
tomcat:~# cat /proc/asound/hwdep
tomcat:~# cat /proc/asound/modules
tomcat:~# cat /proc/asound/version
Advanced Linux Sound Architecture Driver Version k7.2.9+deb13-amd64