** This bug is no longer a duplicate of bug 1555568 [Inspiron 11 - 3147, Realtek ALC3234, Speaker, Internal] Has constant cracking sound, even when idel (no media playback). Muting and unmuting the sound seems to help for around half a minute...
** Summary changed: - Analog Loopback Static in Headphones while on Dell Latitude 3340 Battery Power + [Latitude 3340, Realtek ALC3234, Headphone] Static in Headphones While on Battery Power -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to alsa-driver in Ubuntu. https://bugs.launchpad.net/bugs/1580394 Title: [Latitude 3340, Realtek ALC3234, Headphone] Static in Headphones While on Battery Power Status in alsa-driver package in Ubuntu: New 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 ProcVersionSignature: Ubuntu 4.4.0-21.37-generic 4.4.6 Uname: Linux 4.4.0-21-generic x86_64 ApportVersion: 2.20.1-0ubuntu2 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC1: ubuntu-mate 1718 F.... pulseaudio /dev/snd/controlC0: ubuntu-mate 1718 F.... pulseaudio 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_DIR=<set> 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.:bvrA10:bd11/04/2015:svnDellInc.:pnLatitude3340:pvr00:rvnDellInc.:rn:rvr:cvnDellInc.:ct9:cvr: dmi.product.name: Latitude 3340 dmi.product.version: 00 dmi.sys.vendor: Dell Inc. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/1580394/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
