[Bug 1910920] Re: no soundcard present with linux-image-5.8.0-37-generic

This issue has also been reported on reddit. Also on
https://askubuntu.com/questions/1305763/no-audio-after-apt-upgrade-with-
new-pkgs-ubuntu-20-04-lts .

In my testing I performed the usual steps to get pulse audio working
which failed. The issue happens when upgrading from
config-5.8.0-34-generic to config-5.8.0-36-generic on a KDE Neon
platform. Each machine has an NVidia display and the proprietary
driver. The NVidia driver was update during the same from 418.152.00 to
450.102.04. KDE Neon was upgraded from 5.20.4 to 5.20.5 in the same
cycle. I prepared a machine with a configuration just prior to the
update and so far believe the issue is NOT related to the KDE 5.20.5
update. But some either the kernel or some interaction with the NVidia
driver. I will try to isolate the kernel from the Nividia driver but
the above link seems to point to the audio driver missing from the
kernel.

The issue also causes the system to fail to detect a Logitech USB Webcam
and and external USB headphone (effectively its own sound card). Both
devices are recognized as USB devices but not as input or output media
devices.

root@:~# inxi -SA
System: Host: kingfish Kernel: 5.8.0-36-generic x86_64 bits: 64 Console: tty 1 Distro: KDE neon 20.04 5.20
Audio: Device-1: NVIDIA GM204 High Definition Audio driver: N/A

I get the same output for pulseaudio -vvv and alsamixer as shown in the
link.

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https://bugs.launchpad.net/bugs/1910920

Title:
no soundcard present with linux-image-5.8.0-37-generic

Status in linux package in Ubuntu:
Incomplete

Bug description:
With linux-image-5.8.0-34-generic, all on-board soundcards work
flawlessly.

After update of kernel to linux-image-5.8.0-37-generic durign this
week no soundcards are detected.


I am happy to provide more information.

But I will not sent automatic apport reports because it includes
private local data.

####


!!DMI Information
!!---------------

Manufacturer: LENOVO
Product Name: 20BUS23M00
Product Version: ThinkPad T450
Firmware Version: JBET54WW (1.19 )
Board Vendor: LENOVO
Board Name: 20BUS23M00


!!Kernel Information
!!------------------

Kernel release: 5.8.0-34-generic
Operating System: GNU/Linux
Architecture: x86_64
Processor: x86_64
SMP Enabled: Yes


!!ALSA Version
!!------------

Driver version: k5.8.0-34-generic
Library version: 1.2.3.2
Utilities version: 1.2.3


!!Loaded ALSA modules
!!-------------------

snd_hda_intel
snd_hda_intel


!!Sound Servers on this system
!!----------------------------

Pulseaudio:
Installed - Yes (/usr/bin/pulseaudio)
Running - Yes


!!Soundcards recognised by ALSA
!!-----------------------------

0 [HDMI ]: HDA-Intel - HDA Intel HDMI
HDA Intel HDMI at 0xe1230000 irq 51
1 [PCH ]: HDA-Intel - HDA Intel PCH
HDA Intel PCH at 0xe1234000 irq 52


!!PCI Soundcards installed in the system
!!--------------------------------------

00:03.0 Audio device [0403]: Intel Corporation Broadwell-U Audio Controller [8086:160c] (rev 09)
Subsystem: Lenovo Broadwell-U Audio Controller [17aa:5034]
00:1b.0 Audio device [0403]: Intel Corporation Wildcat Point-LP High Definition Audio Controller [8086:9ca0] (rev 03)
Subsystem: Lenovo Wildcat Point-LP High Definition Audio Controller [17aa:5034]

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