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[Raymond <1520564@xxxxxxxxxxxxxxxxxx>]

3168.666583] vboxguest: module verification failed: signature and/or required key missing - tainting kernel 
[ 3168.671599] vgdrvHeartbeatInit: Setting up heartbeat to trigger every 2000 milliseconds 
[ 3168.672097] input: Unspecified device as /devices/pci0000:00/0000:00:04.0/input/input7 
[ 3168.673418] vboxguest: misc device minor 56, IRQ 20, I/O port d020, MMIO at 00000000f0400000 (size 0x400000) 
[ 3168.673419] vboxguest: Successfully loaded version 5.0.10_Ubuntu (interface 0x00010004)
 [ 3168.689728] [drm] Initialized drm 1.1.0 20060810 
[ 3168.694728] piix4_smbus 0000:00:07.0: SMBus base address uninitialized - upgrade BIOS or use force_addr=0xaddr 
[ 3168.846991] [drm] Initialized vboxvideo 1.0.0 20090303 for 0000:00:02.0 on minor 0 
[ 3168.903905] AVX version of gcm_enc/dec engaged. 
[ 3168.903907] AES CTR mode by8 optimization enabled 
[ 3169.198110] intel_rapl: no valid rapl domains found in package 0 
[ 3169.332374] snd_intel8x0 0000:00:05.0: disable (unknown or VT-d) VM optimization 
[ 3169.556116] Adding 975868k swap on /dev/sda1. Priority:-1 extents:1 across:975868k FS 
[ 3169.621817] snd_intel8x0 0000:00:05.0: white list rate for 1028:0177 is 48000

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Packages, which is subscribed to alsa-driver in Ubuntu.
https://bugs.launchpad.net/bugs/1520564

Title:
  Xubuntu 15.10 low and poor sound on USB headset

Status in alsa-driver package in Ubuntu:
  New

Bug description:
  Running Xubuntu 15.10 64 bits kernel 4.2.0-18 in Oracle Virtualbox
  5.0.8. Using a Microsoft USB headset. Sound is very low and if I crank
  up the volume to the max is sort of audible but distorted and noisy. I
  have a 14.04 Xubuntu and a 15.04 Xubuntu instance on the same
  Virtualbox, using the same headset, and the sound is perfect. I also
  have an Arch instance with kernel 4.2.5-1 on the same Virtualbox and
  the sonud on that one is also good. This issue seems particular to
  Xubuntu 15.10.

  I posted this on the forums about 3-4 weeks ago in the hope that
  someone may have figured a way to fix this. No answer yet.

  ProblemType: Bug
  DistroRelease: Ubuntu 15.10
  Package: alsa-base 1.0.25+dfsg-0ubuntu5
  ProcVersionSignature: Ubuntu 4.2.0-18.22-generic 4.2.3
  Uname: Linux 4.2.0-18-generic x86_64
  ApportVersion: 2.19.1-0ubuntu5
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  cat        1274 F.... pulseaudio
  CurrentDesktop: XFCE
  Date: Fri Nov 27 07:27:39 2015
  InstallationDate: Installed on 2015-10-31 (26 days ago)
  InstallationMedia: Xubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021)
  PackageArchitecture: all
  SourcePackage: alsa-driver
  Symptom: audio
  Title: USB sound card not detected
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 12/01/2006
  dmi.bios.vendor: innotek GmbH
  dmi.bios.version: VirtualBox
  dmi.board.name: VirtualBox
  dmi.board.vendor: Oracle Corporation
  dmi.board.version: 1.2
  dmi.chassis.type: 1
  dmi.chassis.vendor: Oracle Corporation
  dmi.modalias: dmi:bvninnotekGmbH:bvrVirtualBox:bd12/01/2006:svninnotekGmbH:pnVirtualBox:pvr1.2:rvnOracleCorporation:rnVirtualBox:rvr1.2:cvnOracleCorporation:ct1:cvr:
  dmi.product.name: VirtualBox
  dmi.product.version: 1.2
  dmi.sys.vendor: innotek GmbH

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