I haven't taken a closer look yet, but I suspect that the case is that
1) when the first user plugs in headphones, the alsa kcontrol "Speaker" is muted
2) the guest account pulseaudio starts up, without any settings stored
3) the alsa card is loaded and the initial mixer settings are picked up from
alsa
4) at this point the "speaker" port is selected as it has highest priority, so
the initial state is muted, because the "Speaker" kcontrol is muted
5) later in startup, "Headphones" are selected instead, but since there are no
stored setting telling it to unmute, it stays muted.
** Changed in: pulseaudio (Ubuntu)
Status: New => Triaged
** Changed in: pulseaudio (Ubuntu)
Importance: Undecided => Medium
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https://bugs.launchpad.net/bugs/1076947
Title:
Headphone muted in new/guest account
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