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alsa: ignore jack events when the user is inactive

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See the big comment in the code for more details.

BugLink: https://bugs.freedesktop.org/show_bug.cgi?id=93259
This commit is contained in:
Tanu Kaskinen 2016-04-20 15:35:13 +03:00 • committed by Arun Raghavan
parent a19e1e5382
commit fb52a6a6e6
3 changed files with 35 additions and 0 deletions
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28
src/modules/alsa/module-alsa-card.c
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@ -369,6 +369,34 @@ static int report_jack_state(snd_mixer_elem_t *melem, unsigned int mask) {
pa_assert(u);
/* Quick and dirty fix for
* https://bugs.freedesktop.org/show_bug.cgi?id=93259
*
* Changing the jack state may cause a port change, and a port change will
* make the sink or source change the mixer settings. If there are multiple
* users having pulseaudio running, the mixer changes done by inactive
* users may mess up the volume settings for the active users, because when
* the inactive users change the mixer settings, those changes are picked
* up by the active user's pulseaudio instance and the changes are
* interpreted as if the active user changed the settings manually e.g.
* with alsamixer. Even single-user systems suffer from this, because gdm
* runs its own pulseaudio instance.
*
* Returning early here means that jack state events get ignored while the
* user is inactive. When the user becomes active again, the routing may
* not any more match the real jack state. While this is bad, this should
* nevertheless be better than messing up the volume every time headphones
* are plugged in or out.
*
* It might be better to unload the card altogether when the user becomes
* inactive and udev removes the permission to the card. That requires at
* least improving the default sink handling so that if the unloaded card
* contained the default sink, the default sink should be restored to what
* it was earlier, when the user becomes active and the card becomes
* accessible. */
if (u->card->suspend_cause & PA_SUSPEND_SESSION)
return 0;
if (mask == SND_CTL_EVENT_MASK_REMOVE)
return 0;