Bug 90373

Summary:	Noise when a short sound is played with another song playing....
Product:	PulseAudio	Reporter:	Luis Felipe Domínguez Vega <lfdominguez>
Component:	misc	Assignee:	pulseaudio-bugs
Status:	RESOLVED FIXED	QA Contact:	pulseaudio-bugs
Severity:	major
Priority:	medium	CC:	lennart, lfdominguez
Version:	unspecified
Hardware:	x86-64 (AMD64)
OS:	Linux (All)
URL:	https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=782730
Whiteboard:
i915 platform:		i915 features:

Description Luis Felipe Domínguez Vega 2015-05-08 17:47:08 UTC

Hello, well i have a Beats Audio, an Intel HD (IDT92HD91BXX) and I'm usign KDE.
When i listen some music, or viewing any movie, in general listen any kind of
sound, if another sound is played in paralell with the actual then a high noise
crash (always at high volumen, not metter that the hadware volumen is set to
low), for example, if arrive a new email, if a new message is icoming, if i
want to delete something from my filesystem throw dolphin (the sound of the
delete dialog).

This is more explained at bugtracking in debian... in there are the pulseaudio logs and configuration files....

https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=782730

Comment 1 Tanu Kaskinen 2015-05-11 09:28:31 UTC

This sounds like a problem with synchronizing hardware and software volume changes when using flat volumes. This is a problem that can't be solved perfectly. You can try to mitigate it by tweaking the deferred-volume-safety-margin-usec and deferred-volume-extra-delay-usec variables in /etc/pulse/daemon.conf. Or if you are not a fan of the flat volume feature, an easier fix is to set flat-volumes=no in daemon.conf.

Comment 2 Luis Felipe Domínguez Vega 2015-05-11 14:25:06 UTC

Uff thanks, it's works, with flat-volumes in off.... but if not all system work with flat-volumes, why is set to true by default??

Comment 3 Tanu Kaskinen 2015-05-12 15:57:59 UTC

(In reply to Luis Felipe Domínguez Vega from comment #2)
> Uff thanks, it's works, with flat-volumes in off.... but if not all system
> work with flat-volumes, why is set to true by default??

It's true by default, because Lennart (the original PulseAudio author) thought that flat volumes were a great idea, and there are still PulseAudio maintainers with that opinion. If someone submitted a patch that changed the default, that might get accepted. I haven't submitted the patch myself, because I dread the discussion that would ensue.

You could try to convince Debian to change the default. Ubuntu already disables flat volumes by default.

Use of freedesktop.org services, including Bugzilla, is subject to our Code of Conduct. How we collect and use information is described in our Privacy Policy.