[alsa-devel] Internal speakers not working on HP ProBook 455 G2

[Takashi Iwai]

At Thu, 19 Feb 2015 15:24:15 +0900,
Michel D4nzer wrote:
> 
> Hi,
> 
> 
> the built-in speakers of my HP ProBook 455 G2 are not working by
> default. I'm attaching the output of alsa-info.sh.

Is this a regression from earlier kernels?

> In pavucontrol, the speakers appear as "Speakers (unavailable)", and in
> the GNOME sound settings they don't appear at all.
> 
> 
> After some playing around with HDAAnalyzer, I discovered that enabling
> the 'OUT' widget control of pin 0x14 makes the speakers emit sound, see
> the diff below.

Interesting.  This behavior doesn't appear on the emulator, so
something else must have cleared the pin ctl.

To be sure, load snd-hda-intel module with probe_only=1,1 option.
You can check /proc/asound/card1/codec#0 to see which value is set to
the pin 0x14 by BIOS as default.  Then, enable the tracing via
  # echo 1 > /sys/kernel/debug/tracing/events/hda/enable

and configure the codec via
  # echo 1 > /sys/class/sound/hwC1D0/reconfigure

This will set up the PCM and the mixer.  Get the events from
/sys/kernel/debug/tracing/trace.  At this point.  Then check again
whether pin 0x14 is set or not.

Better to check the above without PulseAudio, i.e. do it in runlevel 3
on Linux console.

Once when the problem is confirmed (the pin control is still 0x00),
try to check the events log you got.  The bits 28-32 of the event
value indicates the codec address, the bits 20-28 the widget nid, and
the rest 20 bits the combo of verb + parameter.  So, the command
SET_PIN_WIDGET_CONTROL for the widget 0x14 should appear like
0x01470740 where 0x707 is SET_PIN_WIDGET_CONTROL verb and 0x40 is the
pin control value.


thanks,

Takashi