Public bug reported: If the directory /var/lib/lightdm/.config/pulse exists, then whenever the screen goes blank, the sound volume changes, mutes, or takes on some other random parameters specified by this file. It does not reset on unlocking the screen. This is an extraordinarily dumb behaviour which can be temporarily remedied by deleting that directory, or swapping out lightdm for xscreensaver.
Please make sure that lightdm cannot write a pulse config file, or that consolekit or whatever for pulseaudio does not use system users as sources for parameters, and so forth. ProblemType: Bug DistroRelease: Ubuntu 16.04 Package: lightdm 1.18.3-0ubuntu1.1 ProcVersionSignature: Ubuntu 4.4.0-75.96-generic 4.4.59 Uname: Linux 4.4.0-75-generic x86_64 ApportVersion: 2.20.1-0ubuntu2.5 Architecture: amd64 CurrentDesktop: XFCE Date: Tue May 2 11:23:46 2017 InstallationDate: Installed on 2016-10-09 (204 days ago) InstallationMedia: Xubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160719) SourcePackage: lightdm UpgradeStatus: No upgrade log present (probably fresh install) ** Affects: lightdm (Ubuntu) Importance: Undecided Status: New ** Tags: amd64 apport-bug xenial -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1687722 Title: lightdm should not have a pulseaudio config To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/lightdm/+bug/1687722/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs