I've tried snd_hda_intel.model=alc256-asus-aio on kernel 5.3.0 as well.
Sound is not working.
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https://bugs.launchpad.net/bugs/1850439
Title:
No sound on ASUS UX534FT
To manage
I Have the same problem.
Asus ZenBook 15 UX534FAC-A8053T
Dualboot MS Windows 10 and Ubuntu 18.04.4 LTS bionic
kernel 5.3.0-28-generic
kwinfo --sound :
16: PCI 1f.3: 0403 Audio device
[Created at pci.378]
Unique ID: nS1_.9G5mT1GK4nF
SysFS ID: