pulseaudio assert failure: pulseaudio: mixer.c:929: snd_mixer_elem_get_callback_private: Zusicherung »mixer« nicht erfüllt.

[emk2203]

After startup and login, changed from nvidia proprietary to nouveau

ProblemType: Crash
DistroRelease: Ubuntu 17.04
Package: pulseaudio 1:10.0-1ubuntu2
ProcVersionSignature: Ubuntu 4.10.0-14.16-generic 4.10.3
Uname: Linux 4.10.0-14-generic x86_64
NonfreeKernelModules: zfs zunicode zavl zcommon znvpair
ApportVersion: 2.20.4-0ubuntu2
Architecture: amd64
AssertionMessage: pulseaudio: mixer.c:929: snd_mixer_elem_get_callback_private: Zusicherung »mixer« nicht erfüllt.
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC1: erik 3387 F.... pulseaudio
 /dev/snd/controlC0: erik 3387 F.... pulseaudio
CurrentDesktop: Unity:Unity7
Date: Mon Apr 3 09:17:08 2017
ExecutablePath: /usr/bin/pulseaudio
ExecutableTimestamp: 1490811859
InstallationDate: Installed on 2016-04-08 (359 days ago)
InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Beta amd64 (20160323)
ProcCmdline: /usr/bin/pulseaudio --start --log-target=syslog
ProcCwd: /
ProcEnviron:
 LANG=de_DE.UTF-8
 LANGUAGE=de_DE
 PATH=(custom, no user)
 SHELL=/bin/bash
 XDG_RUNTIME_DIR=<set>
Signal: 6
SourcePackage: pulseaudio
StacktraceTop:
 __assert_fail_base (fmt=<optimized out>, assertion=assertion@entry=0x7fccb9037188 "mixer", file=file@entry=0x7fccb9037419 "mixer.c", line=line@entry=929, function=function@entry=0x7fccb90376a0 "snd_mixer_elem_get_callback_private") at assert.c:92
 __GI___assert_fail (assertion=0x7fccb9037188 "mixer", file=0x7fccb9037419 "mixer.c", line=929, function=0x7fccb90376a0 "snd_mixer_elem_get_callback_private") at assert.c:101
 snd_mixer_elem_get_callback_private () from /usr/lib/x86_64-linux-gnu/libasound.so.2
 ?? () from /usr/lib/pulse-10.0/modules/module-alsa-card.so
 ?? () from /usr/lib/pulse-10.0/modules/module-alsa-card.so
Title: pulseaudio assert failure: pulseaudio: mixer.c:929: snd_mixer_elem_get_callback_private: Zusicherung »mixer« nicht erfüllt.
UpgradeStatus: Upgraded to zesty on 2017-04-03 (0 days ago)
UserGroups: adm cdrom debian-transmission dip lpadmin plugdev sambashare sudo
dmi.bios.date: 08/06/2013
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: A186P105
dmi.board.asset.tag: N/A
dmi.board.name: Z68ITX-B-E
dmi.board.vendor: ZOTAC
dmi.board.version: Rev.00
dmi.chassis.asset.tag: N/A
dmi.chassis.type: 3
dmi.chassis.vendor: N/A
dmi.chassis.version: N/A
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrA186P105:bd08/06/2013:svnMotherboardbyZOTAC:pnZ68ITX-B-E:pvrRev.00:rvnZOTAC:rnZ68ITX-B-E:rvrRev.00:cvnN/A:ct3:cvrN/A:
dmi.product.name: Z68ITX-B-E
dmi.product.version: Rev.00
dmi.sys.vendor: Motherboard by ZOTAC

[Apport retracing service (apport)]

Thank you for taking the time to report this crash and helping to make this software better. This particular crash has already been reported and is a duplicate of bug #1663528, so is being marked as such. Please look at the other bug report to see if there is any missing information that you can provide, or to see if there is a workaround for the bug. Additionally, any further discussion regarding the bug should occur in the other report. Please continue to report any other bugs you may find.