David and I have discussed this, here are the findings : The bug arises from an issue with pulse whereby the supported profile list of a given device changes at runtime so for example (and also specific to this case for this bug) a device which supported a surround profile at startup for some reason during the lifetime of that pulse instance does not support surround any more. But there is no signal or notifications from pulse to say that this profile is no longer supported on this device. Therefore when the user goes to swap to the surround profile, the new sink that should be created by a successfully profile swap does not. And correctly the UI swaps back to the 'default' sink/output.
The UI though should notifiy the user that there is a problem with this device. -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to gnome-control-center in Ubuntu. https://bugs.launchpad.net/bugs/961002 Title: [soundnua] HDMI output is not updated when selected Status in “gnome-control-center” package in Ubuntu: In Progress Bug description: 1) I opened sound settings. 2) I attached and activated a secondary HDMI monitor. 3) I selected the HDMI output in sound settings and clicked "test sound", it was working correctly. 4) I then changed profile for the HDMI output from stereo to 5.1. That's when, I believe, things went wrong. At that point, the selection was moved automatically from the HDMI output to the analog output. When I now reselect the HDMI output, the HDMI output is selected in the left pane, but the right pane UI is not updated - the profile box still says "Analog stereo duplex" and clicking "Test sound" it says "Speaker testing for Analog output". ProblemType: Bug DistroRelease: Ubuntu 12.04 Package: gnome-control-center 1:3.3.92-0ubuntu2 ProcVersionSignature: Ubuntu 3.2.0-19.30-generic 3.2.11 Uname: Linux 3.2.0-19-generic x86_64 NonfreeKernelModules: nvidia ApportVersion: 1.94.1-0ubuntu2 Architecture: amd64 Date: Wed Mar 21 10:21:33 2012 EcryptfsInUse: Yes InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Alpha amd64 (20120118) ProcEnviron: TERM=xterm LANG=en_US.UTF-8 SHELL=/bin/bash SourcePackage: gnome-control-center UpgradeStatus: No upgrade log present (probably fresh install) usr_lib_gnome-control-center: activity-log-manager-control-center 0.9.3-0ubuntu1 deja-dup 21.90-0ubuntu1 gnome-bluetooth 3.2.2-0ubuntu3 indicator-datetime 0.3.91-0ubuntu1 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-control-center/+bug/961002/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : [email protected] Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
