Public bug reported:
Bug report has been generated on a partially working configuration. That
allows ubuntu-bug to do more work.
USB-Audio Connection on Bowers & Wilkens PX Bluetooth Headphones started
working when upgrading kernel from 4.13 to 4.15 series. Then it suddenly
stopped working again on newer kernels. The bug report has been
generated on the latest working mainline kernel 4.15.7. All newer
kernels have some usb quirks in place, which should fix the playback
sample rates to 48 kHz. The quirk seems not to be working correctly - it
seems to hinder the audio system to recognize the USB-device as a sound
device.
The Headphones work on kernels before 4,15.7 when manually configuring
pulseaudio to a default samplerate of 48 kHz.
PX Headphones are on the newest firmware level.
ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: alsa-base 1.0.25+dfsg-0ubuntu5
Uname: Linux 4.15.7-041507-lowlatency x86_64
AlsaInfo: Error: command ['/usr/share/alsa-base/alsa-info.sh', '--stdout',
'--no-upload'] failed with exit code 1: mktemp: failed to create directory via
template '/tmp/zsh-1000/alsa-info.XXXXXXXXXX': No such file or directory
ApportVersion: 2.20.9-0ubuntu7
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC2: dshr 2729 F.... pulseaudio
/dev/snd/controlC1: dshr 2729 F.... pulseaudio
/dev/snd/controlC0: dshr 2729 F.... pulseaudio
CurrentDesktop: GNOME
Date: Sun May 27 22:21:53 2018
InstallationDate: Installed on 2016-02-05 (841 days ago)
InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021)
PackageArchitecture: all
ProcEnviron:
TERM=xterm-256color
PATH=(custom, no user)
XDG_RUNTIME_DIR=<set>
LANG=de_DE.UTF-8
SHELL=/bin/zsh
SourcePackage: alsa-driver
Symptom: audio
Symptom_AlsaPlaybackTest: ALSA playback test through plughw:USB successful
Symptom_Card: PX USB - PX USB
Symptom_DevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC2: dshr 2729 F.... pulseaudio
/dev/snd/controlC1: dshr 2729 F.... pulseaudio
/dev/snd/controlC0: dshr 2729 F.... pulseaudio
Symptom_PulsePlaybackTest: PulseAudio playback test successful
Symptom_Type: No sound at all
Title: [USB-Audio - PX USB, playback] No sound at all
UpgradeStatus: Upgraded to bionic on 2018-05-27 (0 days ago)
dmi.bios.date: 06/23/2015
dmi.bios.vendor: LENOVO
dmi.bios.version: N11ET33W (1.09 )
dmi.board.asset.tag: Not Available
dmi.board.name: 20CJS00Q00
dmi.board.vendor: LENOVO
dmi.board.version: Not Defined
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: None
dmi.modalias:
dmi:bvnLENOVO:bvrN11ET33W(1.09):bd06/23/2015:svnLENOVO:pn20CJS00Q00:pvrThinkPadT550:rvnLENOVO:rn20CJS00Q00:rvrNotDefined:cvnLENOVO:ct10:cvrNone:
dmi.product.family: ThinkPad T550
dmi.product.name: 20CJS00Q00
dmi.product.version: ThinkPad T550
dmi.sys.vendor: LENOVO
** Affects: alsa-driver (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug bionic
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https://bugs.launchpad.net/bugs/1773697
Title:
[USB-Audio - PX USB, playback] No sound at all after kernel upgrade
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