[Bugme-new] [Bug 4233] New: Enable C-state even when only C1 is present

bugme-daemon at osdl.org bugme-daemon at osdl.org
Sun Feb 20 16:16:31 PST 2005


http://bugme.osdl.org/show_bug.cgi?id=4233

           Summary: Enable C-state even when only C1 is present
    Kernel Version: 2.6.11-rc
            Status: NEW
          Severity: normal
             Owner: venkatesh.pallipadi at intel.com
         Submitter: venkatesh.pallipadi at intel.com


Currently, /proc/acpi/processor/CPU*/power will not show C-state statistics 
when only C1 is supported. The patch will enable the /proc/ Cstate interfaces 
even when only C1 is supported. This should not add any performance overhead 
due to acpi_idle routine, as we don't have anything to do at the time of 
running idle routine.
Further, as Dominik pointed out, there can be a case where only C1 is enabled 
in AC power and other C-states get enabled when on battery. The patch here 
will help that case as well.

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