The DSDT entries for the P2 Max are broken, but Github user PeterCxy has built a CPIO override which resolves the problem.
- Download the latest
acpi_overridefile from his releases page
- Add the
acpi_overridefile to the root of your EFI partition (aka
- Add an
initrd=/acpi_overridekernel option to your boot manager - above any other initrd entries (
- No xorg calibration config is needed