From: David Laight > Sent: 11 October 2017 11:04 ... > > > On that system (XEON E5-2600) dmesg contains (retyped): > > > acpi: PNP0A08:00: _OSC: platform does not support [AER] > > > > Per the PCI Firmware spec r3.0, sec 4.5.1, on ACPI platforms, the OS > > is supposed to use _OSC to ask the firmware for permission before > > using AER. In this case, the firmware declined to grant us > > permission, so we're not supposed to do anything at all with AER. > > I read that as 'BIOS knows nothing about AER' rather than 'BIOS > refused to hand over control' - but I could be wrong. > > I'm not sure where to look to see if the actual hardware does. > I'm guessing that Intel Haswell-E should. I've four Haswell root port bridges with the AER block at offset 148. None of them have anything in the three 'root error registers'. So the firmware/bios can't be using the registers - which means the OS could use them. David
