[pulseaudio-tickets] [Bug 93946] Changing device profile to HDMI is reset to default after short delay

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=93946

--- Comment #19 from David Henningsson <david.henningsson at canonical.com> ---
(In reply to Mike C from comment #18)
> (In reply to David Henningsson from comment #16)
> > (In reply to Mike C from comment #14)
> > > Just adding a brief comment to the valuable previous comment #13 that Tanu
> > > made, in my case the "only" available speakers on my system are within the
> > > monitor, so falling back to analog means that gives no sound at all until
> > > the profile is switched back to HDMI. So current behaviour certainly breaks
> > > my sound support, and means that every single time I want to have sound
> > > after not using the machine for a matter of ten minutes or so I then have to
> > > go into the settings and switch profile again. That is not user friendly. 
> > 
> > It's not user friendly to have broken internal speakers (you should talk to
> > your computer manufacturer about that ;-) ). Then your computer tricks PA to
> > think that they are in fact working, and as a result PA makes bad decisions.
> > 
> > If PA 8.0 makes worse decisions for the corner case of "broken internal
> > speakers", but at the same time makes better decisions for many other
> > people, then I would prefer not to revert my patch.
> > 
> 
> The comment that I have "broken internal speakers" does not represent the
> physical situation at all. My computer is a small mini-itx motherboard with
> one of the Ivybridge series of processors, in a fanless enclosure, and does
> not have any internal speakers. So the speakers are not broken at all - they
> don't exist. 

Still, something is telling us that there is an internal speaker, so please
submit alsa-info ( https://wiki.ubuntu.com/Audio/AlsaInfo ) so we know for sure
what it is.

Second, if this is a motherboard that has a "internal speaker" header on it
which you chose not to connect when you built your HTPC, you should configure
the system accordingly, e g by disabling the internal speaker through
hda-jack-retask.

If there is not such a header, then you likely have a bug in BIOS, which we can
work around in the Linux kernel.

> The video and audio goes out from the motherboard through HDMI
> to a monitor that has its own speakers that work perfectly through the HDMI
> connector. Therefore it would not seem unreasonable that having the sound
> set in my configs to go through HDMI to the monitor is the permanent setup
> irrespective of whether the monitor goes into powersaving mode when not used
> for some period. Moving the mouse to get the monitor screen lit up again
> after the system has been left idle is normal operation and I suspect not a
> corner case!

The "corner case" refers to your phantom internal speaker.

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