[HDAudio][ALC285] Native speaker support for HP Spectre x360 15-eb0xxx

[Takashi Iwai]

On Fri, 07 Aug 2020 15:05:12 +0200,
Alexander Giese wrote:
> 
> Hello alsa-devel-team,
> 
> I have a problem with the built-in speakers on the 2020 model of the
> hp-spectre. From my unexperienced point of view, the audio sinks are
> correctly identified and therefore I tried tweaking the GPIO pins with
> success.
> 
> Information from alsa-info is here:
> http://alsa-project.org/db/?f=c8ee13e52fd6b2377573a7123c2887fe4d59c917
> 
> When I use hda-verb with the following parameters 2 of 4 of my
> built-in speakers start working:
> 
> hda-verb /dev/snd/hwC0D0 0x01 SET_GPIO_DATA 0x02 (or 0x04)
> hda-verb /dev/snd/hwC0D0 0x01 SET_GPIO_DIR 0x01
> hda-verb /dev/snd/hwC0D0 0x01 SET_GPIO_MASK 0x01

So this means that GPIO pin#0 (0x01) is the amp, and it needs to be
cleared.

> In addition, my mute-mic-led on the keyboard glows when:
> 
> hda-verb /dev/snd/hwC0D0 0x01 SET_GPIO_DATA 0x01 (or 0x02)
> hda-verb /dev/snd/hwC0D0 0x01 SET_GPIO_DIR 0x04
> hda-verb /dev/snd/hwC0D0 0x01 SET_GPIO_MASK 0x04

And this means GPIO pin#2 being the mic-mute LED, inverted (0=on,
1=off).

To check the behavior, try the following:

 hda-verb /dev/snd/hwC0D0 0x01 SET_GPIO_DIR 0x01
 hda-verb /dev/snd/hwC0D0 0x01 SET_GPIO_MASK 0x01
 hda-verb /dev/snd/hwC0D0 0x01 SET_GPIO_DATA 0x00

this should enable the speaker, and the succeeding call

 hda-verb /dev/snd/hwC0D0 0x01 SET_GPIO_DATA 0x01

turns off the speaker.

Also, 

 hda-verb /dev/snd/hwC0D0 0x01 SET_GPIO_DIR 0x04
 hda-verb /dev/snd/hwC0D0 0x01 SET_GPIO_MASK 0x04
 hda-verb /dev/snd/hwC0D0 0x01 SET_GPIO_DATA 0x00

turns on the mic-mute LED, and the succeeding call

 hda-verb /dev/snd/hwC0D0 0x01 SET_GPIO_DATA 0x04

turns off the LED.

If above is the confirmed, you can manage both in a shot by

 hda-verb /dev/snd/hwC0D0 0x01 SET_GPIO_DIR 0x05
 hda-verb /dev/snd/hwC0D0 0x01 SET_GPIO_MASK 0x05
 hda-verb /dev/snd/hwC0D0 0x01 SET_GPIO_DATA 0x04

will turn on the speaker but off the LED, and

 hda-verb /dev/snd/hwC0D0 0x01 SET_GPIO_DATA 0x05

will turn on both speaker and LED.

And, doesn't the machine have the playback mute LED?  Usually it's
controlled with the GPIO, too, but this case


> Since I do not understand how the GPIO-settings are integrated and
> applied in the upstream software for corresponding models, I would
> very much appreciate any help to get this to work out of the box in
> future releases so I do not have tweak my system all the time and
> others can benefit as well.
> 
> Any suggestions on getting all 4 speakers to work or the
> mute-volume-led to glow are very much welcome alike!

The surround/bass speaker is often more difficult.  We need either the
contact to the vendor or the reverse engineering.


Takashi