[Realtek ALC887-VD] Playback only through 2 channels by default
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
alsa-driver (Ubuntu) |
Confirmed
|
Undecided
|
Unassigned | ||
pulseaudio (Ubuntu) |
New
|
Undecided
|
Unassigned |
Bug Description
Ubuntu does not detect my 5.1 surround sound[0] by default. In order to get it detected, I have to do the following:
1) Open alsamixer
2) Change the "Channel Mode" setting from "2ch" to "6ch" (there is also a "4ch" setting)
3) `pulseaudio -k`
I have to do this on every boot, as the "6ch" setting is not remembered.
[0] My soundcard and sound system are 5.1, but I actually only have front left, center, right and the subwoofer. This shouldn't affect how Ubuntu acts at all (because it can't know what speakers I have plugged in to my subwoofer), but will mean that I can't report on whether or not rear channels are working as expected.
ProblemType: Bug
DistroRelease: Ubuntu 15.04
Package: alsa-base 1.0.25+
ProcVersionSign
Uname: Linux 3.19.0-30-generic x86_64
ApportVersion: 2.17.2-0ubuntu1.5
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/
CurrentDesktop: Unity
Date: Tue Oct 13 10:23:16 2015
EcryptfsInUse: Yes
InstallationDate: Installed on 2014-07-30 (439 days ago)
InstallationMedia: Ubuntu-Server 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.3)
PackageArchitec
SourcePackage: alsa-driver
Symptom: audio
Symptom_
Symptom_Card: Built-in Audio - HDA Intel PCH
Symptom_Jack: Green Line Out, Rear
Symptom_
Symptom_Type: Only some of outputs are working
Title: [MS-7788, Realtek ALC887-VD, Green Line Out, Rear] Playback problem
UpgradeStatus: Upgraded to vivid on 2015-08-24 (49 days ago)
dmi.bios.date: 01/18/2012
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: V2.3
dmi.board.
dmi.board.name: H61M-P31 (G3) (MS-7788)
dmi.board.vendor: MSI
dmi.board.version: 1.0
dmi.chassis.
dmi.chassis.type: 3
dmi.chassis.vendor: MSI
dmi.chassis.
dmi.modalias: dmi:bvnAmerican
dmi.product.name: MS-7788
dmi.product.
dmi.sys.vendor: MSI
modified.
mtime.conffile.
control.1 {
iface MIXER
name 'Channel Mode'
value '2ch'
comment {
access 'read write'
type ENUMERATED
count 1
item.0 '2ch'
item.1 '4ch'
item.2 '6ch'
}
}
this channel mode control limit the availability of 5.1 since the two input jacks have to retask as output jacks
you need to discuss this issue in alsa-devel mailing list and pulseaudio-discuss mailing list
possible way is to add hook which change channel mode when using surround40, surround51
http:// git.alsa- project. org/?p= alsa-lib. git;a=blob; f=src/conf/ cards/HDA- Intel.conf; hb=HEAD
similar to
http:// git.alsa- project. org/?p= alsa-lib. git;a=blob; f=src/conf/ cards/ICH4. conf;hb= HEAD