Here is a link to the latest draft of a PSARC one pager to add an 
optional "mode" argument that may be specified when enabling CPU power 
management to specify polling or event based CPU power management 
pursuant to some of the discussion in:

    3838 Need to disable PM framework polling when PAD is enabled

Please let me know what you think. This is slightly different than 
what's currently implemented in the pad-gate today, but some have 
expressed this as a cleaner approach (thanks to Randy for the idea).

http://www.opensolaris.org/os/project/tesla/Work/CPUPM/cpupm_extn_onepager

Thanks,
-Eric

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