[pulseaudio-discuss] [PATCH v2 4/5] alsa-mixer: Add "default-volume" path option

[Raymond Yau]

>>>
>>> This allows customizing the default volume on a per-path basis.
>>>
>>> The default volume for analog outputs is set to 30%, because that's
>>> less likely to be too loud than the "default default" volume, which
>>> is 100%. Digital outputs typically have another volume control down
>>> the line, so for those it makes sense to keep the default at 100%.
>>
>>
>> Gmane is down, so I can't verify that I said the same the last time, but
>> anyhow :-)
>>
>> Without having looked through the implementation details in the earlier
>> patches, I think it's probably a good idea to have default volumes per
>> port, but I don't want a default in analog-output.conf.common, because
>> at least line outs should also be 100% by default.
>
>
> Hm. This illustrates that there is more than one opinion about the
default. The problem here is that sometimes line-out is used as
headphone-out.
>
> Also "NuForce DAC-80" USB audio card that has a hardware volume control
knob, and I found out that 100% hardware and 100% usb-mixer volume on that
card is enough to overload analog inputs of a Final Sound FVSS 201/Р
receiver.
>
> So, I think that the original plan with a 30% default on all analog
outputs is better.
>
> P.S. I do not own any of hardware mentioned in this email. It was only
demonstrated to me by the salesman.

Most active speakers system have hardware volume knob when using line out ,
this mean the final output is still limited by that knob,

but most headphone/headset does not.

I think those usb headset/headphone are not suitable to set volume at 100%
by default
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