** Also affects: libmatemixer (Ubuntu)
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[Latitude 3340, Realtek ALC3234] MATE - Headphone Static on Battery
Status in alsa-driver package in Ubuntu:
Status in libmatemixer package in Ubuntu:
I have noticed that when I am on battery power on a Dell Latitude 3340
laptop with headphones plugged in , and there is no audio playing on
the computer, there is a consistent static sound that comes through
the headphones at a constant volume that is not affected by changing
the volume level. I think it may be picking up some kind of analog
loopback signal because keyboard presses and disk activity seem to
influence the noise. When I plug the power cable into the laptop , the
static immediately goes away.
I reported this earlier to the upstream Linux Kernel bug tracker, but
it seems to be fixed in any distro running a 4.4 kernel or greater
that I have tested , Except for Ubuntu MATE 16.04 LTS 64-bit. This
make me think it is not a kernel level issue and is found somewhere
either in the audio settings on Ubuntu MATE or a pulseaudio bug. I
cannot reproduce it on any other 16.04 distro version, but it also
affects all the 14.04.4 distros as well.
Running amixer -c 1 set "Loopback Mixing" "Disabled" does not prevent
The BIOS Firmware version is up to date.
DistroRelease: Ubuntu 16.04
Package: pulseaudio 1:8.0-0ubuntu3
ProcVersionSignature: Ubuntu 4.4.0-21.37-generic 4.4.6
Uname: Linux 4.4.0-21-generic x86_64
USER PID ACCESS COMMAND
/dev/snd/controlC1: ubuntu-mate 1718 F.... pulseaudio
/dev/snd/controlC0: ubuntu-mate 1718 F.... pulseaudio
Date: Wed May 11 00:43:52 2016
LiveMediaBuild: Ubuntu-MATE 16.04 LTS "Xenial Xerus" - Release amd64
PATH=(custom, no user)
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.vendor: Dell Inc.
dmi.board.vendor: Dell Inc.
dmi.chassis.vendor: Dell Inc.
dmi.product.name: Latitude 3340
dmi.sys.vendor: Dell Inc.
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