[Bug 10194] New: cpufreq P-state tables can change during runtime, handle it

[Bug 10194] New: cpufreq P-state tables can change during runtime, handle it

[bugme-daemon]

http://bugzilla.kernel.org/show_bug.cgi?id=10194

           Summary: cpufreq P-state tables can change during runtime, handle
                    it
           Product: Power Management
           Version: 2.5
     KernelVersion: 2.6.25-rc4
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: cpufreq
        AssignedTo: cpufreq@www.linux.org.uk
        ReportedBy: Matt_Domsch@dell.com
                CC: wwlinuxengineering@dell.com


ACPI now allows a BIOS to change the P-state tables during runtime.  This can
happen as the result of a power cord being plugged in or out, of a thermal
alarm of some sort which BIOS catches, of a "green" power savings mode set in
BIOS, or possibly other situations.

When BIOS wants to change the tables, it issues an SCI.

acpi-cpufreq does not presently have a way to catch that SCI.  It does not
re-read the P-state tables.  And it does not inform userspace that the values
have changed.


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[Bug 10194] cpufreq P-state tables can change during runtime, handle it

[bugme-daemon]

http://bugzilla.kernel.org/show_bug.cgi?id=10194


Matt_Domsch@dell.com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|wwlinuxengineering@dell.com |linux-bugs@dell.com




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[Bug 10194] cpufreq P-state tables can change during runtime, handle it

[bugme-daemon]

http://bugzilla.kernel.org/show_bug.cgi?id=10194


Matt_Domsch@dell.com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |REJECTED
         Resolution|                            |DOCUMENTED




------- Comment #1 from Matt_Domsch@dell.com  2008-04-09 16:20 -------
this functionality is present already, I just didn't know where to find it.  
acpi_processor_ppc_has_changed() is it.  Closing.


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