Comment 0 for bug 1901139

Just upgraded from Kubuntu 20.04 to 20.10 to find no audio device detected. lsmod shows module loaded, but alsa/pulse/etc is not picking up the audio device. If I boot using the old kernel that was left behind, it works (5.4.0-52 from 20.04). It does not work with shipped kernel (5.8.0-52) & does not work with kernel 5.9.1-050901 (the current unsigned kernel from mainline). lspci shows the device regardless of what I boot. lsmod also shows the driver loading, but I don't see the codec portion of the driver loading on the current and testing kernels.

ProblemType: Bug
DistroRelease: Ubuntu 20.10
Package: linux-image-generic 5.8.0.25.30
ProcVersionSignature: Ubuntu 5.4.0-52.57-generic 5.4.65
Uname: Linux 5.4.0-52-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.11-0ubuntu50
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: andrew 1108 F.... pulseaudio
                      andrew 1112 F.... pipewire-media-
 /dev/snd/seq: andrew 1107 F.... pipewire
CasperMD5CheckResult: skip
CurrentDesktop: KDE
Date: Fri Oct 23 00:59:27 2020
InstallationDate: Installed on 2019-11-16 (341 days ago)
InstallationMedia: Kubuntu 19.10 "Eoan Ermine" - Release amd64 (20191017)
MachineType: Acer Swift SF315-52G
ProcFB: 0 i915drmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.4.0-52-generic root=UUID=821af7d8-e605-4db1-aaef-f6d17905aeec ro quiet splash vt.handoff=7
RelatedPackageVersions:
 linux-restricted-modules-5.4.0-52-generic N/A
 linux-backports-modules-5.4.0-52-generic N/A
 linux-firmware 1.190
SourcePackage: linux
UpgradeStatus: Upgraded to groovy on 2020-10-23 (0 days ago)
dmi.bios.date: 12/21/2018
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: V1.08
dmi.board.asset.tag: Default string
dmi.board.name: Erdinger_KL
dmi.board.vendor: KBL
dmi.board.version: V1.08
dmi.chassis.type: 10
dmi.chassis.vendor: Acer
dmi.chassis.version: V1.08
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrV1.08:bd12/21/2018:svnAcer:pnSwiftSF315-52G:pvrV1.08:rvnKBL:rnErdinger_KL:rvrV1.08:cvnAcer:ct10:cvrV1.08:
dmi.product.family: Swift 3
dmi.product.name: Swift SF315-52G
dmi.product.sku: 0000000000000000
dmi.product.version: V1.08
dmi.sys.vendor: Acer