No sound from Sigmatel STAC9228X speakers

["Joel Carnat" <joel%carnat.net@localhost>]

Hi,

I have just installed NetBSD 7.0/amd64 on a Dell XPS M1330 and have a (weird) sound issue.

I can hear (Firefox HTML5) video sound from both headphone jacks but not from the internal speakers.
No idea what happens. Mixer works OK when headphones are plugged but not when it is unplugged.

Any ideas ?
Tia,
  Jo

PS: here's a bunch of outputs. Feel free to ask for more if required :)

xps# dmesg | grep 'hda'
hdaudio0 at pci0 dev 27 function 0: HD Audio Controller
hdaudio0: interrupting at ioapic0 pin 21
hdafg0 at hdaudio0: Sigmatel STAC9228X
hdafg0: DAC00 2ch: Speaker [Built-In], HP Out [Jack]
hdafg0: DAC01 2ch: Speaker [Jack]
hdafg0: ADC02 2ch: Mic In [Jack]
hdafg0: ADC03 2ch: Mic In [Built-In]
hdafg0: DIG04 2ch: SPDIF Out [Jack]
hdafg0: 2ch/2ch 44100Hz 48000Hz 88200Hz 96000Hz 192000Hz PCM16 PCM20 PCM24 AC3
audio0 at hdafg0: full duplex, playback, capture, mmap, independent
hdafg1 at hdaudio0: vendor 0x1095 product 0x1392
hdafg1: HDMI00 8ch: Digital Out [Jack]
hdafg1: 8ch/0ch 48000Hz PCM16*
hdafg0: unsol: tag=0
hdafg0: unsol: tag=0
hdafg0: unsol: tag=0
hdafg0: unsol: tag=0
hdafg0: unsol: tag=0
hdafg0: unsol: tag=0

xps# mixerctl -av
outputs.master=112,112 volume delta=2
outputs.master.mute=off  [ off on ]
outputs.master2=254,254 volume delta=2
outputs.master2.mute=off  [ off on ]
record.mic=0,0 volume delta=51
inputs.reclvl=0,0 volume delta=17
record.mic2=0,0 volume delta=256
record.mic2.mute=off  [ off on ]
inputs.reclvl2=0,0 volume delta=256
inputs.reclvl2.mute=off  [ off on ]
inputs.beep=255,255 volume delta=64
outputs.dacsel=DAC00,DAC01,DIG04  { DAC00 DAC01 DIG04 }
record.source=ADC02,ADC03  { ADC02 ADC03 }