[alsa-devel] ASoC: rt5640, rt5651 jack-detect and BYT SST suspend/resume patches / status update

[Hans de Goede]

Hi,

On 14-02-18 15:51, Pierre-Louis Bossart wrote:
> 
>>>> Carlo or Pierre-Louis can one of you check using e.g.
>>>> the left + right speaker test in gnome-control-panel's
>>>> sound config-applet if that left only goes to the left
>>>> speaker and right only goes to the right speaker?
>>>>
>>>> My bytcr-rt5651 tablet has only one speaker, but I
>>>> here sound for both the left and right speaker tests
>>>> which suggests some right-to-left mixing is happening
>>>> which we don't want on devices with stereo speakers.
>>>> Could be there is some mixing happening outside of the
>>>> codec on this tablet, still it would be good to test
>>>> this.
>>>
>>> Just tested this and it works fine on my hardware.
>>
>> Great, thank you.
>>
>> Note I've seem the same magic mono mixing happening on a
>> CHT + rt5651 tablet I've also been testing on. It is weird
>> how the hardware seems to magically mix the left and
>> right channels to the mono speaker without explicitly
>> enabling that in the codec/mixer settings as one needs
>> to do for the rt5640 and rt5645. But hey if it works
>> it works :)
> 
> The rt5651 does not have a built-in amplifier, it provides a line out that is then fed into a discrete amplifier, the mixing could happen at that level too.

Yes I think that that is what is happening, thank you for your answer.

Regards,

Hans