Exactly the same problem with Samsung Notebook 9 Pro (np930mbe-k04us) which also has an ALC298.
Headphones are working with model=mono-speakers.
I attached my Realtek dump.
I'm also soliciting the arch forum for help (I'm running arch):
https://bbs.archlinux.org/viewtopic.php?pid=1897858
Exactly the same problem with Samsung Notebook 9 Pro (np930mbe-k04us) which also has an ALC298.
Headphones are working with model=mono- speakers.
I attached my Realtek dump.
I'm also soliciting the arch forum for help (I'm running arch):
https:/ /bbs.archlinux. org/viewtopic. php?pid= 1897858