I have a galaxy book ion with ubuntu 20.04 and have exactly the same issue.  

I have found that I can make the headset jack work if I issue this
command :

sudo hda-verb /dev/snd/hwC0D0 0x1a SET_PIN_WIDGET_CONTROL 0x5

But it only lasts until the sound subsystem goes to sleep (i.e. no sound
to play or changing sound sources).

I have found no viable way to make the speakers work.  One forum I read
said it was likely due to the AKG Smart Amp in these new Samsung

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  Galaxy Book Ion, sof-hda-dsp detected but no soound (ubuntu 20.04)

Status in alsa-driver package in Ubuntu:

Bug description:
  Ubuntu Release : ubuntu 20.04 LTS release 20.04
  Driver : alsa-base : 1.0.25+dfsg-0ubuntu5

  On Galaxy Book Ion (model NP950XCJ-X01, from 2020)
  The audio device (AKG Stereo Speakers) is detected as : sof-hda-dsp
  Profile : Play HiFi quality music

  But I get no sound either from the speakers of headphone jack.
  Guessing a driver issue, hardware not properly detected.

  Note : Laptop was provided with windows10, sound is ok on windows (so
  it's not an hardware issue).


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