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Bug#958737: linux-image-5.5.0-0.bpo.2-amd64 sound broken on Dell Latutude 14 2-in-1

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  Bug#958737: linux-image-5.5.0-0.bpo.2-amd64 sound broken on Dell Latutude 14 2-in-1 Matteo Semplice <quelldinumer@yahoo.it> - 2020-05-17 18:50 +0200

#67111 — Bug#958737: linux-image-5.5.0-0.bpo.2-amd64 sound broken on Dell Latutude 14 2-in-1

I am affected by this bug too on a Dell Latitude 14" 2-in-1.

~$ apt list --installed | grep linux-image

WARNING: apt does not have a stable CLI interface. Use with caution in 
scripts.

linux-image-5.4.0-rc8/now 5.4.0-rc8-2 amd64 [installato, locale]
linux-image-5.5.0-0.bpo.2-amd64/buster-backports,now 5.5.17-1~bpo10+1 
amd64 [installato, automatico]
linux-image-5.5.0-rc5-amd64/now 5.5~rc5-1~exp1 amd64 [installato, locale]
linux-image-amd64/buster-backports,now 5.5.17-1~bpo10+1 amd64 [installato]

Sound was working on a custom built 5.4.0-rc8 and on the 5.5.0-rc5 from 
experimental, but after the upgrade to 5.5.0-0.bpo.2 I have only a 
"Dummy output" in my mixer.

The results of journalctl -b | grep "00:1f\.3" are

== 5.5.0-rc5 == working sound ==

~# journalctl -b | grep "00:1f\.3"

mag 17 17:04:19 dentdherens kernel: pci 0000:00:1f.3: [8086:02c8] type 
00 class 0x040100
mag 17 17:04:19 dentdherens kernel: pci 0000:00:1f.3: reg 0x10: [mem 
0x6001118000-0x600111bfff 64bit]
mag 17 17:04:19 dentdherens kernel: pci 0000:00:1f.3: reg 0x20: [mem 
0x6001000000-0x60010fffff 64bit]
mag 17 17:04:19 dentdherens kernel: pci 0000:00:1f.3: PME# supported 
from D3hot D3cold
mag 17 17:04:19 dentdherens kernel: pci 0000:00:1f.3: Adding to iommu 
group 12
mag 17 17:04:19 dentdherens kernel: snd_hda_intel 0000:00:1f.3: DSP 
detected with PCI class/subclass/prog-if info 0x040100
mag 17 17:04:19 dentdherens kernel: snd_hda_intel 0000:00:1f.3: enabling 
device (0000 -> 0002)
mag 17 17:04:19 dentdherens kernel: snd_hda_intel 0000:00:1f.3: bound 
0000:00:02.0 (ops i915_audio_component_bind_ops [i915])
mag 17 17:58:20 dentdherens kernel: input: HDA Digital PCBeep as 
/devices/pci0000:00/0000:00:1f.3/sound/card0/input30
mag 17 17:58:20 dentdherens kernel: input: HDA Intel PCH Headphone Mic 
as /devices/pci0000:00/0000:00:1f.3/sound/card0/input31
mag 17 17:58:20 dentdherens kernel: input: HDA Intel PCH HDMI/DP,pcm=3 
as /devices/pci0000:00/0000:00:1f.3/sound/card0/input32
mag 17 17:58:20 dentdherens kernel: input: HDA Intel PCH HDMI/DP,pcm=7 
as /devices/pci0000:00/0000:00:1f.3/sound/card0/input33
mag 17 17:58:20 dentdherens kernel: input: HDA Intel PCH HDMI/DP,pcm=8 
as /devices/pci0000:00/0000:00:1f.3/sound/card0/input34
mag 17 17:58:20 dentdherens kernel: input: HDA Intel PCH HDMI/DP,pcm=9 
as /devices/pci0000:00/0000:00:1f.3/sound/card0/input35
mag 17 17:58:20 dentdherens kernel: input: HDA Intel PCH HDMI/DP,pcm=10 
as /devices/pci0000:00/0000:00:1f.3/sound/card0/input36

=======================

== 5.5.0-0.bpo.2 == sound not working ==

mag 17 17:14:29 dentdherens kernel: pci 0000:00:1f.3: [8086:02c8] type 
00 class 0x040100
mag 17 17:14:29 dentdherens kernel: pci 0000:00:1f.3: reg 0x10: [mem 
0x6001118000-0x600111bfff 64bit]
mag 17 17:14:29 dentdherens kernel: pci 0000:00:1f.3: reg 0x20: [mem 
0x6001000000-0x60010fffff 64bit]
mag 17 17:14:29 dentdherens kernel: pci 0000:00:1f.3: PME# supported 
from D3hot D3cold
mag 17 17:14:29 dentdherens kernel: pci 0000:00:1f.3: Adding to iommu 
group 12
mag 17 17:14:29 dentdherens kernel: snd_hda_intel 0000:00:1f.3: DSP 
detected with PCI class/subclass/prog-if info 0x040100
mag 17 17:14:29 dentdherens kernel: snd_hda_intel 0000:00:1f.3: Digital 
mics found on Skylake+ platform, using SOF driver
mag 17 18:08:38 dentdherens kernel: sof-audio-pci 0000:00:1f.3: DSP 
detected with PCI class/subclass/prog-if info 0x040100
mag 17 18:08:38 dentdherens kernel: sof-audio-pci 0000:00:1f.3: Digital 
mics found on Skylake+ platform, using SOF driver
mag 17 18:08:38 dentdherens kernel: sof-audio-pci 0000:00:1f.3: enabling 
device (0000 -> 0002)
mag 17 18:08:38 dentdherens kernel: sof-audio-pci 0000:00:1f.3: warning: 
No matching ASoC machine driver found
mag 17 18:08:38 dentdherens kernel: sof-audio-pci 0000:00:1f.3: DSP 
detected with PCI class/subclass/prog-if 0x040100
mag 17 18:08:38 dentdherens kernel: sof-audio-pci 0000:00:1f.3: use msi 
interrupt mode
mag 17 18:08:38 dentdherens kernel: sof-audio-pci 0000:00:1f.3: bound 
0000:00:02.0 (ops i915_audio_component_bind_ops [i915])
mag 17 18:08:38 dentdherens kernel: sof-audio-pci 0000:00:1f.3: hda 
codecs found, mask 5
mag 17 18:08:38 dentdherens kernel: sof-audio-pci 0000:00:1f.3: using 
HDA machine driver skl_hda_dsp_generic now
mag 17 18:08:38 dentdherens kernel: sof-audio-pci 0000:00:1f.3: 
firmware: failed to load intel/sof/sof-cml.ri (-2)
mag 17 18:08:38 dentdherens kernel: sof-audio-pci 0000:00:1f.3: Direct 
firmware load for intel/sof/sof-cml.ri failed with error -2
mag 17 18:08:38 dentdherens kernel: sof-audio-pci 0000:00:1f.3: error: 
request firmware intel/sof/sof-cml.ri failed err: -2
mag 17 18:08:38 dentdherens kernel: sof-audio-pci 0000:00:1f.3: error: 
failed to load DSP firmware -2
mag 17 18:08:38 dentdherens kernel: sof-audio-pci 0000:00:1f.3: error: 
sof_probe_work failed err: -2

===========================

It seems that the version in backports recognizes the "Digital mics 
found on Skylake+ platform, using SOF driver" but then fails to load a 
firmware for it, whereas the 5.5.0-rc5 version did not recognize the 
"digital mic" but at least gave a working speaker and mic/headphone jack.

Matteo S.

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