[pulseaudio-discuss] [RFC] Should we set Front=0dB for the headphone path?

Colin Guthrie gmane at colin.guthr.ie
Wed Aug 31 02:40:45 PDT 2011

'Twas brillig, and David Henningsson at 31/08/11 10:05 did gyre and gimble:
> On 07/04/2011 10:19 AM, David Henningsson wrote:
>> On 2011-07-03 15:00, Colin Guthrie wrote:
>>> 'Twas brillig, and David Henningsson at 01/07/11 14:03 did gyre and
>>> gimble:
>>>> I wonder if we're better off with the attached patch. I've seen more
>>>> than one system where the volume control named "Front" is a part of
>>>> audio path for headphones. The attached patch would be somewhat of a
>>>> compromise: While we don't merge it into the path, as that would be
>>>> regressing machines where "Front" isn't a part of the audio path, it
>>>> would still enable sound on these machines. The question is if "Front"
>>>> is turning on some output it shouldn't on some machines, but I think it
>>>> wouldn't: this should (for all common systems I can think of) be fixed
>>>> through the driver's auto-mute anyway.
>>> Seems like a reasonable compromise to me, but does anyone else have any
>>> opinions on this? Or perhaps any cases where regressions could be
>>> caused?
>>> (see my latest comment on the path_set_condense() method which checks
>>> volume use for OFF which could actually get in the way here!!)
>>>> The other option would be to quirk every single machine that has this
>>>> problem to a separate udev rule -> profile-set -> path .conf file.
>>>> What do you think?
>>> Yeah I really don't like that option. If we do need some quirks here I'd
>>> much rather see them implemented in a more fine grained way than with
>>> udev rules... as it's a bit of blunt object. But ideally avoid it
>>> altogether.
>>> Col
>> Ok, here's a patch properly formatted for inclusion.
> After having seen yet another with the same problem, I have now included
> this patch in Ubuntu.

I presume you don't mean the latter option (udev quirks)?

If it's the first one, we should probably carry it upstream until a
better solution is available. I'd rather do it once in a blessed way
(even if it's a work around) than having different quirks in different
distros if possible (makes generic upstream support easier).



Colin Guthrie

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