[alsa-devel] No sound for several minutes after reboot

[Markus Trippelsdorf]

On 2016.08.30 at 10:04 +0200, Takashi Iwai wrote:
> On Mon, 29 Aug 2016 16:02:33 +0200,
> Markus Trippelsdorf wrote:
> > 
> > On 2016.08.29 at 14:06 +0200, Markus Trippelsdorf wrote:
> > > On 2016.08.29 at 11:32 +0200, Takashi Iwai wrote:
> > > > On Mon, 29 Aug 2016 11:20:47 +0200,
> > > > Markus Trippelsdorf wrote:
> > >  output:ALSA def-222   [003] ....   422.035002: hda_send_cmd: [0000:00:14.2:0] val=0x01570d01
> > >  output:ALSA def-222   [003] ....   422.035061: hda_get_response: [0000:00:14.2:0] val=0x00000000
> > 
> > Actually it right here that sound starts again:
> > 
> > markus at x4 hda-emu % ./a.out 0x01570d01
> > raw value = 0x01570d01
> > cid = 0, nid = 0x15, verb = 0x70d, parm = 0x01
> > raw value: verb = 0x70d, parm = 0x1
> > verbname = set_digi_cvt_1
> 
> So, the program itself sets the value.  Which sound backend are you
> using?  PulseAudio, whatever?

No backend at all. I use mpd directly on type hw:

pcm.!default {
  type hw
  card 0
  device 3
}

> Basically you need to track the verb 0x01570dXX that changes the
> digital converter parameter.
> 
> When the driver was loaded and initialized, what value does the node
> have?  Also check the raw ctl elements, too.  The value is controlled
> via "IEC958 Status" controls.  If the value at the init time is wrong,
> you may set the initial value via "iecset" program included in
> alsa-utils.

The driver is build directly into my monolithic kernel (I don't have
modules enabled at all).
At boot time I run "alsactl restore" in an init script.
alsamixer shows that S/PDIF is unmuted, but as I wrote it doesn't work
for several minutes. If I toggle the S/PDIF setting in alsamixer from
unmuted to muted to unmuted then sounds starts working.

Anyway:
 /usr/bin/hda-verb /dev/snd/hwC0D0 0x15 SET_DIGI_CONVERT_1 0x01 &> /dev/null
works fine in my init script, so the issue is solved for me.

Thanks.

-- 
Markus