Comment 0 for bug 1879054

After update from 18.04 to 20.04 sound stopped working.
KDE does not display Xonar sound card at all.

Alsamixer displays Xonar set at full volume but changing anything there does not seem to have any effect.

Running:
$ sudo alsa force-reload
fixes the issue (until restart sound is back, and is displayed properly in KDE)

(data after restart)
$ arecord -l
**** Lista CAPTURE urządzeń ****
karta 0: DX [Xonar DX], urządzenie 0: Multichannel [Multichannel]
  Urządzenia podrzędne: 1/1
  Urządzenie podrzędne #0: subdevice #0
karta 0: DX [Xonar DX], urządzenie 1: Digital [Digital]
  Urządzenia podrzędne: 1/1
  Urządzenie podrzędne #0: subdevice #0

$ cat /proc/asound/cards
 0 [DX ]: AV200 - Xonar DX
                      Asus Virtuoso 100 at 0xd000, irq 31
 1 [HDMI ]: HDA-Intel - HDA ATI HDMI
                      HDA ATI HDMI at 0xfe960000 irq 67

(build in motherboard soundcard is disabled in BIOS)

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: pulseaudio 1:13.99.1-1ubuntu3.2
ProcVersionSignature: Ubuntu 5.4.0-29.33-generic 5.4.30
Uname: Linux 5.4.0-29-generic x86_64
ApportVersion: 2.20.11-0ubuntu27
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: nait 5242 F.... pulseaudio
 /dev/snd/controlC1: nait 5242 F.... pulseaudio
CasperMD5CheckResult: skip
CurrentDesktop: KDE
Date: Sat May 16 14:54:07 2020
InstallationDate: Installed on 2018-11-11 (552 days ago)
InstallationMedia: Kubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 (20180725)
SourcePackage: pulseaudio
UpgradeStatus: Upgraded to focal on 2020-05-01 (14 days ago)
dmi.bios.date: 09/27/2018
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 1.J0
dmi.board.asset.tag: To be filled by O.E.M.
dmi.board.name: B350 TOMAHAWK (MS-7A34)
dmi.board.vendor: Micro-Star International Co., Ltd.
dmi.board.version: 1.0
dmi.chassis.asset.tag: To be filled by O.E.M.
dmi.chassis.type: 3
dmi.chassis.vendor: Micro-Star International Co., Ltd.
dmi.chassis.version: 1.0
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr1.J0:bd09/27/2018:svnMicro-StarInternationalCo.,Ltd.:pnMS-7A34:pvr1.0:rvnMicro-StarInternationalCo.,Ltd.:rnB350TOMAHAWK(MS-7A34):rvr1.0:cvnMicro-StarInternationalCo.,Ltd.:ct3:cvr1.0:
dmi.product.family: To be filled by O.E.M.
dmi.product.name: MS-7A34
dmi.product.sku: To be filled by O.E.M.
dmi.product.version: 1.0
dmi.sys.vendor: Micro-Star International Co., Ltd.