What does ACPI NMI LINT mean? and Why it changes across kernel version?

I'd like to understand what the following lines mean [ 0.000000] ACPI: LAPIC_NMI (acpi_id[0x01] dfl dfl lint[0x0]) [ 0.000000] ACPI: NMI not connected to LINT 1! [ 0.000000] ACPI: LAPIC_NMI (acpi_id[0x02] dfl dfl lint[0x0]) [ 0.000000] ACPI: NMI not connected to LINT 1! [ 0.000000] ACPI: LAPIC_NMI (acpi_id[0x03] dfl dfl lint[0x0]) [ 0.000000] ACPI: NMI not connected to LINT 1! [ 0.000000] ACPI: LAPIC_NMI (acpi_id[0x04] dfl res lint[0x6f]) [ 0.000000] ACPI: NMI not connected to LINT 1! And why the value of the second to last line changes across the kernel version? e.g.: with kernel 4.9.3 it's [0x6f] with kernel 4.7.8 it's [0x1f] and so on