no sound on Intel Sunrise Point-LP HD Audio (rev 21) on Galaxy Book

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Hello,

Since 4 weeks, I'm trying to make the sound working on my new Galaxy Book, 
without success, and I cannot find any workaround or even documentation to 
track the problem. 

My system doesn't show any error messages, during boot nor playing a WAV file.

The only strange thing is at the boot, snd_hda_codec_realtek reports to find 0 
outputs (please see just below). 

Any help to set up the outputs of my device or tracking a bug will be _very_ 
appreciated !!!!

Thanks in advance,

Plx

##########
dmesg | grep snd
[    5.300498] snd_hda_intel 0000:00:1f.3: enabling device (0000 -> 0002)                                                                                                   
[    5.301100] snd_hda_intel 0000:00:1f.3: bound 0000:00:02.0 (ops 
i915_audio_component_bind_ops [i915])                                                                    
[    5.343916] snd_hda_codec_realtek hdaudioC0D0: autoconfig for ALC298: 
line_outs=1 (0x17/0x0/0x0/0x0/0x0) type:speaker                                                    
[    5.343918] snd_hda_codec_realtek hdaudioC0D0:    speaker_outs=0 
(0x0/0x0/0x0/0x0/0x0)                                                                                   
[    5.343919] snd_hda_codec_realtek hdaudioC0D0:    hp_outs=0 
(0x0/0x0/0x0/0x0/0x0)                                                                                        
[    5.343920] snd_hda_codec_realtek hdaudioC0D0:    mono: mono_out=0x0                                                                                                     
[    5.343921] snd_hda_codec_realtek hdaudioC0D0:    inputs:
[    5.343922] snd_hda_codec_realtek hdaudioC0D0:      Mic=0x18
[    5.343923] snd_hda_codec_realtek hdaudioC0D0:      Internal Mic=0x12


#########
inxi -Axx
Resuming in non X mode: glxinfo not found. For package install advice run: 
inxi --recommends
Audio:     Card Intel Sunrise Point-LP HD Audio driver: snd_hda_intel bus-ID: 
00:1f.3 chip-ID: 8086:9d71
           Sound: Advanced Linux Sound Architecture v: k4.14.12-1-ARCH

#########
uname -a
Linux XXXXXXX 4.14.12-1-ARCH #1 SMP PREEMPT Fri Jan 5 18:19:34 UTC 2018 
x86_64 GNU/Linux

#######
aplay -L
null
    Discard all samples (playback) or generate zero samples (capture)
default:CARD=PCH
    HDA Intel PCH, ALC298 Analog
    Default Audio Device
sysdefault:CARD=PCH
    HDA Intel PCH, ALC298 Analog
    Default Audio Device
front:CARD=PCH,DEV=0
    HDA Intel PCH, ALC298 Analog
    Front speakers
surround21:CARD=PCH,DEV=0
    HDA Intel PCH, ALC298 Analog
    2.1 Surround output to Front and Subwoofer speakers
surround40:CARD=PCH,DEV=0
    HDA Intel PCH, ALC298 Analog
    4.0 Surround output to Front and Rear speakers
surround41:CARD=PCH,DEV=0
    HDA Intel PCH, ALC298 Analog
    4.1 Surround output to Front, Rear and Subwoofer speakers
surround50:CARD=PCH,DEV=0
    HDA Intel PCH, ALC298 Analog
    5.0 Surround output to Front, Center and Rear speakers
surround51:CARD=PCH,DEV=0
    HDA Intel PCH, ALC298 Analog
    5.1 Surround output to Front, Center, Rear and Subwoofer speakers
surround71:CARD=PCH,DEV=0
    HDA Intel PCH, ALC298 Analog
    7.1 Surround output to Front, Center, Side, Rear and Woofer speakers

#########
fuser -v /dev/snd/*
                     			UTIL.      PID 		ACCÈS  	COMMANDE
/dev/snd/controlC0:	clark       482 	F.... 		kded5
                     			clark       701 	F.... 		kmix

#########
amixer -c 0
Simple mixer control 'Master',0
  Capabilities: pvolume pswitch
  Playback channels: Front Left - Front Right
  Limits: Playback 0 - 127
  Mono:
  Front Left: Playback 85 [67%] [-21.00dB] [on]
  Front Right: Playback 85 [67%] [-21.00dB] [on]
Simple mixer control 'PCM',0
  Capabilities: pvolume
  Playback channels: Front Left - Front Right
  Limits: Playback 0 - 255
  Mono:
  Front Left: Playback 255 [100%] [0.00dB]
  Front Right: Playback 255 [100%] [0.00dB]
Simple mixer control 'Mic',0
  Capabilities: pvolume pswitch
  Playback channels: Front Left - Front Right
  Limits: Playback 0 - 31
  Mono:
  Front Left: Playback 31 [100%] [12.00dB] [on]
  Front Right: Playback 31 [100%] [12.00dB] [on]
Simple mixer control 'Mic Boost',0
  Capabilities: volume
  Playback channels: Front Left - Front Right
  Capture channels: Front Left - Front Right
  Limits: 0 - 3
  Front Left: 3 [100%] [30.00dB]
  Front Right: 3 [100%] [30.00dB]
Simple mixer control 'Capture',0
  Capabilities: cvolume cswitch
  Capture channels: Front Left - Front Right
  Limits: Capture 0 - 127
  Front Left: Capture 127 [100%] [30.00dB] [on]
  Front Right: Capture 127 [100%] [30.00dB] [on]
Simple mixer control 'Internal Mic Boost',0
  Capabilities: volume
  Playback channels: Front Left - Front Right
  Capture channels: Front Left - Front Right
  Limits: 0 - 3
  Front Left: 3 [100%] [30.00dB]
  Front Right: 3 [100%] [30.00dB]
Simple mixer control 'Loopback Mixing',0
  Capabilities: enum
  Items: 'Disabled' 'Enabled'
  Item0: 'Enabled'

#######
cat /proc/asound/cards
 0 [PCH            ]: HDA-Intel - HDA Intel PCH
                      HDA Intel PCH at 0xdf638000 irq 130

#######
cat /proc/asound/devices
  2: [ 0]   : control
  3: [ 0- 0]: digital audio playback
  4: [ 0- 0]: digital audio capture
  5: [ 0- 0]: hardware dependent
 33:        : timer

#########
cat /proc/asound/pcm
00-00: ALC298 Analog : ALC298 Analog : playback 1 : capture 1




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