Upstream v4.7-rc2 kernel does not boot if parameter acpi is set to force on Overdrive. (acpi=off gets to the prompt) When set to force it doesn't get to the Linux boot process and stalls. Here's the BIOS info: Version 2.17.1249. Copyright (C) 2015 American Megatrends, Inc. BIOS Date: 09/03/2015 13:52:32 Ver: ROD0084E00