[alsa-devel] HDMI LPE audio on Intel Compute Stick 2nd Gen (CHT)

[Pierre-Louis Bossart]

On 10/20/17 8:45 AM, Ian W MORRISON wrote:
>> I've just noticed that non of the kernels from v4.13 and up run on my
>>> Intel Compute Stick (2nd gen Cherry Trail STK1AW32SC) unit and have
>>> HDMI LPE audio working.
>>>
>>
>> I have not tested HDMI in a while but I am not aware of any issues either.
>> There were some patches recently to fix PulseAudio problems and I suppose
>> some folks used a recent kernel?
>>
>>
> It actually happened since v4.12 as now I get three HDMI LPE Audio devices
> show up with 'aplay -l' rather than just one. Only 'device 2' works so if I
> change the sink to use that device I get sound. So basically it can be
> fixed in userland however I'm seeing others with different devices also
> complaining how audio is broken and I think it is something that many users
> don't know to fix. Is it worth looking into further or just leaving it as a
> known issue?

I don't think it's a bug, it's a feature...
The jack information tells you which device is connected/active, so 
userspace has all the data needed to select the right routing.