no sound on dmix device but with hwplug for squeezelite

[riker1]

Hi
strangewise i do not have any sound
using the dmix alsa device.

playing is fine with hwplug

error in log:
[09:36:56.700262] mixer_init_alsa:803 attach error: No such file or directory
[09:45:58.474343] output_init_alsa:912 Initialization of mixer failed, reverting to software volume
[09:58:56.192739] output_init_alsa:912 Initialization of mixer failed, reverting to software volume

#SL_SOUNDCARD="plughw:CARD=ALSA,DEV=0"
SL_SOUNDCARD="dmix:CARD=ALSA,DEV=0"

speaker-test -c 2 -t wav -d dmix:CARD=ALSA,DEV=0 is working as well

Running Jessie on RPI

any hints ?

Thanks T