in my case, mainline kernels, including 4.15-rc8, do also not work (even with acpi=off).
However, 4.15-rc8 boots when adding (in grub) the 5 (!) options (all seem to be necessary) acpi=off noapic nolapic irqpoll pnpbios=off (the first 3 options are not sufficient; the last two options alone also not sufficient...).
ad #16:
in my case, mainline kernels, including 4.15-rc8, do also not work (even with acpi=off).
However, 4.15-rc8 boots when adding (in grub) the 5 (!) options (all seem to be necessary) acpi=off noapic nolapic irqpoll pnpbios=off (the first 3 options are not sufficient; the last two options alone also not sufficient...).