SHR headphones not detecting

[arne anka]

there are two possible explanations:
- you have to push in the headphone plug harder to actually connect --  
hearing only in one earphone usually is a sign for that
- you needt to plug in _after_ establishing the call. not sure, how a) shr  
handles that and b) if fso did fix it -- but with debian i frequently  
experienced that the state file was switched only after establishing a  
communication, ie when calling or accepting with the headphones already  
plugged in, the state would nevertheless siwtch to handset, i had to  
unplug and replug the headphones to make the state switch correctly.