On Saturday, 26. May 2018, deloptes wrote:
> wofgdkncxojef@... wrote:
> 
> will check the attachments later, but evidently amixer and amixer_c0 differ,
> which means either you capture wrong output, or pulse is not your default
> mixer.
> 
> I found this for you perhaps you double check
> 
> > Realtek ALC888
> 
> I have here linux-4.15.8 but you can look in whatever release you have
> 
> ALC88x/898/1150
> ======================
> acer-aspire-4930g
>     Acer Aspire 4930G/5930G/6530G/6930G/7730G
> acer-aspire-8930g
>     Acer Aspire 8330G/6935G
> acer-aspire
>     Acer Aspire others
> inv-dmic
>     Inverted internal mic workaround
> no-primary-hp
>     VAIO Z/VGC-LN51JGB workaround (for fixed speaker DAC)
> dual-codecs
>     ALC1220 dual codecs for Gaming mobos
> 
> [linux-4.15.8/Documentation/sound/hd-audio/models.rst]
> 
> 
> anyway, try a different model option if you have such a problem.
> Some other models may match better and give you more matching
> functionality.  If none of the available models works, send a bug
> report.  See the bug report section for details.
> 
> [linux-4.15.8/Documentation/sound/hd-audio/notes.rst]
> 
> 
> this is (was) done via adding in /etc/modprobe.d/alsa-base.conf
> 
> options snd-hda-intel model=MODEL
> 
> sudo alsa force-reload 
> 
> or reboot after
> 
> 
> 
As I have a similar problems with lenovo and dell laptops, I have played around with your solution.
The model specification does not help in my case. 
The dell laptop shows HDMI as first card (but there is no digital output...)
With the following entry in /etc/modprobe.d/alsa-base.conf

options snd-hda-intel enable=1 index=0
options snd-hda-intel enable=0 index=1

the card numbers are swapped and the vol-keys are working.
Thanks 
Stef