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I Have a Gigabyte GA 970a-DS3P motherboard with integrated audio
chipset, which alsamixer reports to be an ALC887-VD.

I uploaded the results of the ALSA script here:
http://www.alsa-project.org/db/?f=bb6145b1a62c657c1af981b00dd2e3928b466dcb

I have a line out connector on the back of the motherboard (along with
line in and mic), and a headphones and a mic connector on the front of
the PC.

The problem is that when I plug in my headphones, the speakers (connected via the back connector) continue to play as well.
Also, I haven't found yet a way to set the volume independently for the headphones and the speakers via the Gnome/Unity sound settings. I can only do that via alsamixer, where the "Headphone" control refers to the headphones, and "Front" to the speakers.
--- 
ApportVersion: 2.14.1-0ubuntu3.10
Architecture: amd64
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC0:  mardy     25530 F.... pulseaudio
 /dev/snd/controlC1:  mardy     25530 F.... pulseaudio
CRDA:
 country RU:
 	(2402 - 2482 @ 40), (N/A, 20)
 	(5735 - 5835 @ 20), (N/A, 30)
CurrentDesktop: Unity
DistroRelease: Ubuntu 14.04
HibernationDevice: RESUME=UUID=37820918-257b-4b60-917f-94c55c98fa24
InstallationDate: Installed on 2015-05-16 (4 days ago)
InstallationMedia: Ubuntu 14.04.2 LTS "Trusty Tahr" - Release amd64 (20150218.1)
MachineType: Gigabyte Technology Co., Ltd. To be filled by O.E.M.
Package: linux (not installed)
ProcFB:
 0 radeondrmfb
 1 radeondrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.16.0-37-generic root=UUID=5f77a868-de36-4b0b-91e9-bd05e1f93bf8 ro quiet splash iommu=soft vt.handoff=7
ProcVersionSignature: Ubuntu 3.16.0-37.51~14.04.1-generic 3.16.7-ckt9
RelatedPackageVersions:
 linux-restricted-modules-3.16.0-37-generic N/A
 linux-backports-modules-3.16.0-37-generic  N/A
 linux-firmware                             1.127.12
RfKill:
 0: phy0: Wireless LAN
 	Soft blocked: no
 	Hard blocked: no
Tags:  trusty
Uname: Linux 3.16.0-37-generic x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip disk lpadmin plugdev sambashare sudo vboxusers
_MarkForUpload: True
dmi.bios.date: 12/29/2014
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: F2j
dmi.board.asset.tag: To be filled by O.E.M.
dmi.board.name: 970A-DS3P
dmi.board.vendor: Gigabyte Technology Co., Ltd.
dmi.board.version: x.x
dmi.chassis.asset.tag: To Be Filled By O.E.M.
dmi.chassis.type: 3
dmi.chassis.vendor: Gigabyte Technology Co., Ltd.
dmi.chassis.version: To Be Filled By O.E.M.
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrF2j:bd12/29/2014:svnGigabyteTechnologyCo.,Ltd.:pnTobefilledbyO.E.M.:pvrTobefilledbyO.E.M.:rvnGigabyteTechnologyCo.,Ltd.:rn970A-DS3P:rvrx.x:cvnGigabyteTechnologyCo.,Ltd.:ct3:cvrToBeFilledByO.E.M.:
dmi.product.name: To be filled by O.E.M.
dmi.product.version: To be filled by O.E.M.
dmi.sys.vendor: Gigabyte Technology Co., Ltd.

** Affects: alsa-driver (Ubuntu)
     Importance: Undecided
         Status: Confirmed


** Tags: apport-collected trusty
-- 
Realtek ALC887-VD speakers don't mute when headphones are inserted
https://bugs.launchpad.net/bugs/1457476
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