[alsa-devel] Realtek ALC294 Intel Sunrise Point-LP HD Audio driver - sound does not work

[Tomasz Przybył]

Hello Devs

Lots of users with Intel Sunrise Point-LP HD Audio driver (ALC294) 
(snd_hda_intel) have major issue. Not sound at all. Only crackling from 
external speakers OR silence from internal notebook speakers.
Tried fix with extra boot flags does not work at all.

Also affected Asus VivoBook R542UF

```
Machine:
   Type: Laptop System: ASUSTeK product: VivoBook 15_ASUS Laptop X542UF
   v: 1.0 serial: <filter>
   Mobo: ASUSTeK model: X542UF v: 1.0 serial: <filter>
   UEFI: American Megatrends v: X542UF.303 date: 03/15/2018
Audio:
   Device-1: Intel Sunrise Point-LP HD Audio driver: snd_hda_intel
   v: kernel bus ID: 00:1f.3
   Sound Server: ALSA Kernel: 4.19
```
```
aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: PCH [HDA Intel PCH], device 0: ALC294 Analog [ALC294 Analog]
   Subdevices: 1/1
   Subdevice #0: subdevice #0
card 0: PCH [HDA Intel PCH], device 3: HDMI 0 [HDMI 0]
   Subdevices: 1/1
   Subdevice #0: subdevice #0
card 0: PCH [HDA Intel PCH], device 7: HDMI 1 [HDMI 1]
   Subdevices: 1/1
   Subdevice #0: subdevice #0
card 0: PCH [HDA Intel PCH], device 8: HDMI 2 [HDMI 2]
   Subdevices: 1/1
   Subdevice #0: subdevice #0
card 0: PCH [HDA Intel PCH], device 9: HDMI 3 [HDMI 3]
   Subdevices: 1/1
   Subdevice #0: subdevice #0
card 0: PCH [HDA Intel PCH], device 10: HDMI 4 [HDMI 4]
   Subdevices: 1/1
   Subdevice #0: subdevice #0
```
Dmesg parts
```
[ 12.342528] snd_hda_codec_realtek hdaudioC0D0: autoconfig for ALC294: 
line_outs=1 (0x14/0x0/0x0/0x0/0x0) type:speaker
[ 12.342531] snd_hda_codec_realtek hdaudioC0D0: speaker_outs=0 
(0x0/0x0/0x0/0x0/0x0)
[ 12.342533] snd_hda_codec_realtek hdaudioC0D0: hp_outs=1 
(0x21/0x0/0x0/0x0/0x0)
[ 12.342535] snd_hda_codec_realtek hdaudioC0D0: mono: mono_out=0x0
[ 12.342536] snd_hda_codec_realtek hdaudioC0D0: inputs:
[ 12.342538] snd_hda_codec_realtek hdaudioC0D0: Mic=0x1b
```
```
[ 12.634171] input: HDA Intel PCH Headphone as 
/devices/pci0000:00/0000:00:1f.3/sound/card0/input18
[ 12.634389] input: HDA Intel PCH HDMI/DP,pcm=3 as 
/devices/pci0000:00/0000:00:1f.3/sound/card0/input19
[ 12.634563] input: HDA Intel PCH HDMI/DP,pcm=7 as 
/devices/pci0000:00/0000:00:1f.3/sound/card0/input20
[ 12.634737] input: HDA Intel PCH HDMI/DP,pcm=8 as 
/devices/pci0000:00/0000:00:1f.3/sound/card0/input21
[ 12.634905] input: HDA Intel PCH HDMI/DP,pcm=9 as 
/devices/pci0000:00/0000:00:1f.3/sound/card0/input22
[ 12.635045] input: HDA Intel PCH HDMI/DP,pcm=10 as 
/devices/pci0000:00/0000:00:1f.3/sound/card0/input23
```

Regards

Tomasz