id summary reporter owner description type status priority milestone component version resolution keywords cc blockedby blocking platform 8085 Severe boot issues on AMD AM3+ UEFI motherboard AMD 970/SB950 kallisti5 tqh "Booting latest r43091 gcc4 image results in multiple problems on an Asus M5A97 EVO UEFI mainboard. last log message seen before lockup: {{{ ACPI Error: [RAMB] Namespace lookup failure, AE_NOT_FOUND . . usb ohci -1: smm is in control of the host controller }}} This board doesn't have a serial port built-in so logs will be difficult given the lock up is so early. Disabling APIC and ACPI gives a continuous loop of... {{{ ahci: AHCIPort::InterruptErrorHandler port 0, fCommandsActive 0x00000000, is 0x00000040, ci 0x00000000 ahci: ssts 0x00000001 ahci: sctl 0x00000301 ahci: serr 0x40800000 ahci: sact 0x00000000 ahci: Port Connect Change ahci: AHCIPort::InterruptErrorHandler port 0, fCommandsActive 0x00000000, is 0x00000040, ci 0x00000000 ahci: ssts 0x00000000 ahci: sctl 0x00000301 ahci: serr 0x40800000 ahci: sact 0x00000000 ahci: Port Connect Change }}}" bug new normal R1 Drivers/ACPI R1/Development SB950,UEFI All