I didnt get the speaker to run!!
Its an new pi top ceed with ubuntu mate.
Pi top proto and one speaker is mounted on the magnetic rac.
I tryed to make a work around with all the methods mentioned above:
nothing works.
I think there is basic fault.
Can I reach the raspian config under ubuntu-mate?
May be there is the mistake.
Perhaps you have another idea?
Thank you.
robinie