[ubuntu-studio-users] sound - ubuntu studio 15.10

[damon]

Hi
   No sound on 15.10. I had sound on 14.04
  Dell Precision 490 Workstation.
    HDA intel STAC9200
   modeprobe.d/alsa-base.conf has snd-intel8x0m index -2
   Tried adding snd-intel model=STAC9200 index=-2 no help
      ...sound hdaudioCODO autoconfig for STAC9200
      seemed happy but no sound.
     Thank's
       Damon