I have noticed this also. After testing it seems to be a race condition.
I can only reproduce it when headphones are unplugged (not plugged in).
Essentially what is happening is that the headphone port becomes
unavailable therefore the backend goes to remove that output which
results in the UI moving to the next available port. Meanwhile the
speaker port becomes available but at that stage the damage is done as
the UI thinks the other device should be default. One potential solution
would be for the backend to always guarantee that the port which has
just become available to always send it's signal first ahead of the
signal which will remove the unavailable port.
** Changed in: gnome-control-center (Ubuntu)
Status: New => Triaged
** Changed in: gnome-control-center (Ubuntu)
Importance: Undecided => Low
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https://bugs.launchpad.net/bugs/989893
Title:
[soundnua] Audio doesn't correctly switch when headphones are plugged
in/unplugged
Status in “gnome-control-center” package in Ubuntu:
Triaged
Bug description:
If I plug in my headphones, it switches to "Digital Output (S/PDIF)"
and I hear no sound. The bottom option in the hardware list correctly
changes to "Headphones", but it doesn't automatically choose that
option. If I manually click "Headphones" at that point, the sound
works through the headphones. If I unplug them, it also switches to
"Digital Output (S/PDIF)", and the bottom option in the hardware list
changes to "Speakers". If I manually click "Speakers", the speakers
work as expected.
ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: gnome-control-center 1:3.4.1-0ubuntu1
ProcVersionSignature: Ubuntu 3.2.0-24.37-generic 3.2.14
Uname: Linux 3.2.0-24-generic x86_64
ApportVersion: 2.0.1-0ubuntu6
Architecture: amd64
Date: Fri Apr 27 10:41:43 2012
ExecutablePath: /usr/bin/gnome-control-center
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release amd64 (20110427.1)
ProcEnviron:
PATH=(custom, no user)
LANG=en_US.UTF-8
SHELL=/bin/bash
SourcePackage: gnome-control-center
UpgradeStatus: Upgraded to precise on 2012-04-27 (0 days ago)
usr_lib_gnome-control-center:
activity-log-manager-control-center 0.9.4-0ubuntu3
deja-dup 22.0-0ubuntu2
gnome-bluetooth 3.2.2-0ubuntu5
indicator-datetime 0.3.94-0ubuntu2
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