Great news, will test alsa upgrade  as well.

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2016-09-08 10:13 GMT+02:00 John Axel Eriksson <email address hidden>:

> Early indications here are that updating the ALSA drivers fixes the
> problem. I've usually noticed the problem when coming in to work and the
> machine has been suspended, I did that whole thing now and reconnected
> external display + headphones and I got proper sound. Seems promising.
>
> --
> You received this bug notification because you are subscribed to the bug
> report.
> https://bugs.launchpad.net/bugs/1580882
>
> Title:
>   [Intel Broadwell HDMI, Digital Out] Sound like half speed after
>   suspend
>
> Status in alsa-driver package in Ubuntu:
>   Confirmed
>
> Bug description:
>   Ubuntu 16.04 all updates applied.
>
>   Playback to headphones is just fine. If I switch output to one of my
> monitor, connected by HDMI, the soudn comes out there, but with half speed.
> That sounds kinda funny, but weird and not as it should.
>   Maybe it is somehow related to suspend mode as it was fine a few days
> ago (after a reboot? Can't reboot now to test, sorry).
>
>   I already tried sudo /sbin/alsa force-reload but that didn't do
>   anything.
>
>   ProblemType: Bug
>   DistroRelease: Ubuntu 16.04
>   Package: alsa-base 1.0.25+dfsg-0ubuntu5
>   ProcVersionSignature: Ubuntu 4.4.0-22.39-generic 4.4.8
>   Uname: Linux 4.4.0-22-generic x86_64
>   ApportVersion: 2.20.1-0ubuntu2
>   Architecture: amd64
>   AudioDevicesInUse:
>    USER        PID ACCESS COMMAND
>    /dev/snd/controlC1:  jott       3698 F.... pulseaudio
>    /dev/snd/pcmC0D3p:   jott       3698 F...m pulseaudio
>    /dev/snd/controlC0:  jott       3698 F.... pulseaudio
>   CurrentDesktop: Unity
>   Date: Thu May 12 08:42:46 2016
>   InstallationDate: Installed on 2016-04-25 (16 days ago)
>   InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64
> (20160420.1)
>   PackageArchitecture: all
>   SourcePackage: alsa-driver
>   Symptom: audio
>   Symptom_AlsaPlaybackTest: ALSA playback test through plughw:HDMI failed
>   Symptom_Card: Internes Audio - HDA Intel HDMI
>   Symptom_Jack: Digital Out, HDMI
>   Symptom_Type: None of the above
>   Title: [, Intel Broadwell HDMI, Digital Out, HDMI] Playback problem
>   UpgradeStatus: No upgrade log present (probably fresh install)
>   dmi.bios.date: 08/12/2015
>   dmi.bios.vendor: Intel Corporation
>   dmi.bios.version: RYBDWi35.86A.0350.2015.0812.1722
>   dmi.board.name: NUC5i5RYB
>   dmi.board.vendor: Intel Corporation
>   dmi.board.version: H40999-504
>   dmi.chassis.type: 3
>   dmi.modalias: dmi:bvnIntelCorporation:bvrRYBDWi35.86A.0350.2015.
> 0812.1722:bd08/12/2015:svn:pn:pvr:rvnIntelCorporation:
> rnNUC5i5RYB:rvrH40999-504:cvn:ct3:cvr:
>
> To manage notifications about this bug go to:
> https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+
> bug/1580882/+subscriptions
>