[Latitude 3340, Realtek ALC3234] MATE - Headphone Static on Battery Power
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
alsa-driver (Ubuntu) |
New
|
Undecided
|
Unassigned |
Bug Description
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 static.
The BIOS Firmware version is up to date.
ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: pulseaudio 1:8.0-0ubuntu3
ProcVersionSign
Uname: Linux 4.4.0-21-generic x86_64
ApportVersion: 2.20.1-0ubuntu2
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/
/dev/snd/
CasperVersion: 1.376
CurrentDesktop: MATE
Date: Wed May 11 00:43:52 2016
LiveMediaBuild: Ubuntu-MATE 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
ProcEnviron:
TERM=xterm
PATH=(custom, no user)
XDG_RUNTIME_
LANG=en_US.UTF-8
SHELL=/bin/bash
SourcePackage: pulseaudio
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 11/04/2015
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A10
dmi.board.vendor: Dell Inc.
dmi.chassis.type: 9
dmi.chassis.vendor: Dell Inc.
dmi.modalias: dmi:bvnDellInc.
dmi.product.name: Latitude 3340
dmi.product.
dmi.sys.vendor: Dell Inc.
no longer affects: | ubuntu-mate |
affects: | pulseaudio (Ubuntu) → alsa-driver (Ubuntu) |
summary: |
- Analog Loopback Static in Headphones while on Dell Latitude 3340 Battery - Power + [Latitude 3340, Realtek ALC3234, Headphone] Static in Headphones While + on Battery Power |
summary: |
- [Latitude 3340, Realtek ALC3234, Headphone] Static in Headphones While - on Battery Power + [Latitude 3340, Realtek ALC3234] MATE - Headphone Static on Battery + Power |
Changed in libmatemixer (Ubuntu): | |
status: | New → Invalid |
no longer affects: | libmatemixer (Ubuntu) |
tags: | removed: trusty |
Still present in Ubuntu MATE 16.04.2 LTS 64-bit, not reproducible in any other Xenial variant.
Similar to the issue described at https:/ /askubuntu. com/questions/ 457910/ strange- noise-in- headphones- when-no- sound-is- played