[X550CC, Realtek ALC270, Black Headphone Out, Left] No sound at all

Bug #1304074 reported by Daniel Mendonça on 2014-04-07
This bug affects 4 people
Affects Status Importance Assigned to Milestone
alsa-driver (Ubuntu)

Bug Description

I have sound from the laptop, but no sound when i use the jack. It works when running windows.

ProblemType: Bug
DistroRelease: Ubuntu 13.10
Package: alsa-base 1.0.25+dfsg-0ubuntu4
ProcVersionSignature: Ubuntu 3.11.0-19.33-generic
Uname: Linux 3.11.0-19-generic x86_64
ApportVersion: 2.12.5-0ubuntu2.2
Architecture: amd64
 /dev/snd/controlC0: daniel 1734 F.... pulseaudio
 /dev/snd/pcmC0D0p: daniel 1734 F...m pulseaudio
Date: Mon Apr 7 23:17:24 2014
InstallationDate: Installed on 2014-02-26 (40 days ago)
InstallationMedia: Ubuntu-GNOME 13.10 "Saucy Salamander" - Release amd64 (20131017)
MarkForUpload: True
PackageArchitecture: all
SourcePackage: alsa-driver
Symptom: audio
Symptom_AlsaPlaybackTest: ALSA playback test through plughw:PCH failed
Symptom_Card: Built-in Audio - HDA Intel PCH
 /dev/snd/controlC0: daniel 1734 F.... pulseaudio
 /dev/snd/pcmC0D0p: daniel 1734 F...m pulseaudio
Symptom_Jack: Black Headphone Out, Left
Symptom_Type: No sound at all
Title: [X550CC, Realtek ALC270, Black Headphone Out, Left] No sound at all
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 10/16/2013
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: X550CC.217
dmi.board.asset.tag: ATN12345678901234567
dmi.board.name: X550CC
dmi.board.vendor: ASUSTeK COMPUTER INC.
dmi.board.version: 1.0
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: ASUSTeK COMPUTER INC.
dmi.chassis.version: 1.0
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrX550CC.217:bd10/16/2013:svnASUSTeKCOMPUTERINC.:pnX550CC:pvr1.0:rvnASUSTeKCOMPUTERINC.:rnX550CC:rvr1.0:cvnASUSTeKCOMPUTERINC.:ct10:cvr1.0:
dmi.product.name: X550CC
dmi.product.version: 1.0
dmi.sys.vendor: ASUSTeK COMPUTER INC.

Launchpad Janitor (janitor) wrote :

Status changed to 'Confirmed' because the bug affects multiple users.

Changed in alsa-driver (Ubuntu):
status: New → Confirmed
Exie (extered) wrote :

Well, I've done some research on this

Seems like plugging the headphones in makes pulseaudio change the audio sink port. You can see that by using the

pacmd list | grep "active port"

and when you change active port back to "analog-output-speaker" with headphones connected, everything works fine. Give it a try:

pacmd set-sink-port 0 analog-output-speaker

But I wonder if someone can fix that problem with analog-output-headphones or just automatically change the volume level without changing audio sink port (auto-mute works just fine)

Exie (extered) wrote :

Also I forgot to mention that upgrading my system fixed the issue, but then I booted to Windows and everything isn't working properly again

Exie (extered) wrote :

Well... Something really really strange is happening. Everything is working again with analog-output-headphones. I guess, I can reproduce this bug again by simply rebooting to windows

On 2015-04-05 02:18, Exie wrote:
> Could you please do something on that bug? It is really frequent bug
> among the devices with ALC270 on-board (#998266, #1087428 and many
> others, just search for "ALC270"). Thank you!

Yes, this seems to hit enough people to try to fix...

Based on your comment in bug 1304074 I have a guess of what could be
wrong, but I need someone to test a fix. Can you help me with that? I
will provide more instructions in the bug shortly.

David Henningsson, Canonical Ltd.

David Henningsson (diwic) wrote :


Could you - or anyone else affected by this bug - try this dkms package? Install it, reboot and test. Or reboot into Windows and back again, if that's what it takes to reproduce it.

And let me know if it's working or not working.

Note that the DKMS package contain changes for Asus X550CC, K55VJ, S550CB and K55VD. If you have something else you need to submit AlsaInfo so I can add the relevant match for the machine.


David Henningsson (diwic) wrote :

For reference, here's the patch applied to the DKMS package.

David Henningsson (diwic) wrote :
tags: added: patch
Exie (extered) wrote :

Everything works fine for now. Thank you

Exie (extered) wrote :

Lol. And again, it's stuck. I think it is caused by windows being in hibernation mode

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