OpenSolaris

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Bug ID 6715149
Synopsis T-State support for intel based processors
State 10-Fix Delivered (Fix available in build)
Category:Subcategory kernel:pm
Keywords
Responsible Engineer Mark Haywood
Reported Against snv_91
Duplicate Of
Introduced In
Commit to Fix snv_97
Fixed In snv_97
Release Fixed solaris_nevada(snv_97) , solaris_10u7(s10u7_06) (Bug ID:2167126)
Related Bugs 6681777
Submit Date 16-June-2008
Last Update Date 28-August-2008
Description 
The CPU Power Management code should support _TPC ACPI event notification.

The _TPC method (Throttling Present Capabilities) is the ACPI control method that
dynamically indicates to OSPM the number of throttling states currently supported by the
platform.

For more information about _TPC refer the ACPI 3.0b - section 8.4.3.3

Solaris does not do any monitoring and changing of T-States similar to P-States.
It just supports the TPC notification. When the OSPM receives a _TPC event, it refers 
to the corresponding state in the _TSS object and throttles the processor to the required
level indicated by the _TPC event.
Work Around 
N/A
Comments 
N/A