[beertank]

#0531:
dmesg http://sprunge.us/MHFE
lsmod http://sprunge.us/hTKC
aplay -l http://sprunge.us/fLJJ
vcdbg log msg http://sprunge.us/iKDD

#0601:
dmesg http://sprunge.us/TLIh
lsmod http://sprunge.us/eGIR
aplay -l http://sprunge.us/KFIX
vcdbg log msg http://sprunge.us/jVZa

Thanks. Does copying /flash/overlays/rpi-dac.dtbo from #0531 to #0601 make it work?

Yes it does Thanks....

Same problem with #0602, same fix cures it. Will I have to keep copying #0531 rpi-dac.dtbo to keep fixing it?