Working acpi kernel options for Asus FX503VD?

On kernel version *4.15.0-sabayon*, the only way to load X is with the kernel options: acpi_osi=! acpi_osi='Windows 2009' (and acpi=off but that's radical and leaves me with no sensors). Otherwise I get unresponsive black screen and no obvious error in the X.org log. The problem with this option is that it turns off the *Elan 1200 touchpad* (not only for me, other people complain about it as well). So I'm looking for other (if possible tested) kernel options which might work on my laptop (or similar). I've tested already many permutations of different windows versions and modeset and acpi_rev_override=5 and pcie_port_pm=off, but obviously I can't cover them all so if anyone had success with this, please share.