Public bug reported:
On Ubuntu 20.04, running kernel 5.4.0-40-generic, the internal speakers,
headphone jack, and mic do not work at all. No audio devices appear in
the Sound settings or in pavucontrol. By appending options snd_hda_intel
dmic_detect=0 to /etc/modprobe.d/alsa-base.conf, I can get audio
working, but the microphone (unsuprisingly) does not work. Appending
options snd-intel-dspcfg dsp_driver=1 to alsa_base.conf as the same
effect as dmic_detect=0. Attempts to fix with option snd_hda_intel
device=generic or deveice=auto have had no effect. This bug does NOT
manifest on 5.4.0-23-generic, the kernel version featured on the 20.04
live media. After installation, and updating to 5.4.0-40-generic, the
bug manifests on the next boot.
Note that the audio hardware seems to work properly w/o workaround on a
small (< 5%) percentage of boots, but I have been unable to reproduce
this. With the workaround enabled, inxi -A gives
Audio:
Device-1: Intel Smart Sound Audio driver: snd_hda_intel
Sound Server: ALSA v: k5.4.0-40-generic
ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: linux-image-5.4.0-40-generic 5.4.0-40.44
ProcVersionSignature: Ubuntu 5.4.0-40.44-generic 5.4.44
Uname: Linux 5.4.0-40-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.3
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: jill 1374 F.... pulseaudio
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
Date: Sun Jul 5 13:32:58 2020
InstallationDate: Installed on 2020-07-03 (2 days ago)
InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423)
MachineType: LENOVO 81YK
ProcEnviron:
TERM=xterm-256color
PATH=(custom, no user)
XDG_RUNTIME_DIR=<set>
LANG=en_US.UTF-8
SHELL=/bin/bash
ProcFB: 0 i915drmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.4.0-40-generic
root=UUID=dc3e058d-42fc-4de4-b94a-749c1295dc68 ro quiet splash vt.handoff=7
RelatedPackageVersions:
linux-restricted-modules-5.4.0-40-generic N/A
linux-backports-modules-5.4.0-40-generic N/A
linux-firmware 1.187.1
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 03/18/2020
dmi.bios.vendor: LENOVO
dmi.bios.version: DPCN40WW
dmi.board.asset.tag: NO Asset Tag
dmi.board.name: LNVNB161216
dmi.board.vendor: LENOVO
dmi.board.version: SDK0J40709 WIN
dmi.chassis.asset.tag: NO Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: IdeaPad 5 15IIL05
dmi.modalias:
dmi:bvnLENOVO:bvrDPCN40WW:bd03/18/2020:svnLENOVO:pn81YK:pvrIdeaPad515IIL05:rvnLENOVO:rnLNVNB161216:rvrSDK0J40709WIN:cvnLENOVO:ct10:cvrIdeaPad515IIL05:
dmi.product.family: IdeaPad 5 15IIL05
dmi.product.name: 81YK
dmi.product.sku: LENOVO_MT_81YK_BU_idea_FM_IdeaPad 5 15IIL05
dmi.product.version: IdeaPad 5 15IIL05
dmi.sys.vendor: LENOVO
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug focal wayland-session
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https://bugs.launchpad.net/bugs/1886341
Title:
Kernel Regression causes laptop internal audio devices to fail to load
w/o unacceptable workaround
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