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. -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. 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] To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1910920/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
