I have made it working for UX391UA laptop. I am using Linux Mint 19.
What I did:
1. Follow this on how to download and compile linux kernel from sources (I use 
4.19.9)
2. check compiled kernel (reboot)
3. Apply 3 patches from here:
3.1 https://lkml.org/lkml/2018/12/7/158
3.2 https://lkml.org/lkml/2018/12/7/160
3.3 https://lkml.org/lkml/2018/12/7/159
4. Additionally specify my laptop in same file by adding one more change:
SND_PCI_QUIRK(0x1043, 0x14a1, "ASUS UX533FD", ALC294_FIXUP_ASUS_SPK),
+SND_PCI_QUIRK(0x1043, 0x10a1, "ASUS UX391UA", ALC294_FIXUP_ASUS_SPK),
5. Recompile kernel and reboot
6. Now I have sound!

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https://bugs.launchpad.net/bugs/1784485

Title:
  [ZenBook S UX391UA, Realtek ALC294, Mic, Internal] No sound at all

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