https://bugzilla.novell.com/show_bug.cgi?id=432809
User jakub007@go2.pl added comment
https://bugzilla.novell.com/show_bug.cgi?id=432809#c5
--- Comment #5 from Jakub Jozwicki 2008-10-08 16:04:00 MDT ---
http://www.amd.com/us-en/assets/content_type/white_papers_and_tech_docs/4125...
2.4.3.1 C1 Enhanced State (C1E)
The C1 enhanced state (C1E) is a stop-grant state supported by the processor.
The C1E state is characterized by
the following properties:
• All cores are in the halt (C1) state.
• The ACPI-defined P_LVL3 register has been accessed.
• The IO Hub has issued a STPCLK assertion message with the appropriate
SMAF for C1E entry. Note
that [The ACPI Power State Control Registers] F3x[84:80] specify the
processor clocking and voltage
behavior in response to the C1E SMAF.
• The processor has issued a STOP_GRANT message to the IO Hub.
General requirements for C1E:
• The ACPI-defined C2 and C3 states must not be declared to the
operating system.
• The ACPI-defined P_LVL2_LAT should be greater than 100.
• The ACPI-defined P_LVL3_LAT should be greater than 1000.
• C1E should only be enabled when the platform is in ACPI power
management mode.
• C1E is not supported when CLMC is used by the IO Hub.
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