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_CSD (C-State Dependency) – Important for multi-core: coordinating package C-states.If you see repeated acpi genuineintel... lines in dmesg or syslog, it means a userspace tool (like turbostat, cpupower, or powertop) is constantly re-reading ACPI processor info. This is rare but can be fixed by updating acpid or disabling CPU hotplug debug.
[ 0.000000] ACPI: GENUINEINTEL --- Intel64 Family 6 Model 58
[ 0.000000] Intel Ivy Bridge CPU detected
[ 0.001234] acpi PNP0A08: _OSC: OS supports [ExtendedConfig ASPM ClockPM Segments MSI HPX-Type3]
[ 0.567890] intel_idle: MWAIT substates: 0x2120