AIX-based mechanism to query and set the system power mode and any related attributes

Request an AIX mechanism (such as a C API or script) to query and alter the system power mode. Currently, the only interface provided is via the ASMI, limiting accessibility to manual interaction through a Web browser, customer-supplied integration or unsupported integration.

Requirements:
- Command issued from the AIX LPAR.
- The workflow should use the most efficient path to communicate queries and alterations. (For example, a complex LPAR-HMC-FSP interaction should avoided if there's a way for the LPAR to manage the interaction more directly through the PHYP.)
- Command can always be initiated from a whole-system LPAR or a Service Partition residing on the target frame. This RFE doesn't prescribe the entitlement of other LPARs.
- Commands can be run dynamically, with no interruption or disruption to running LPARs. (This requirement is not simply that IPLs shouldn't be required. Issuing and executing the command itself should not cause any shocks, global locks, etc. on running LPARs. It is understood that CPU processing rate may gradually decrease if a lower power rate is elected.)
- Queried data is current. It should not be polling values that are updated infrequently by some external batch.
- New power mode elections take effect dynamically and transition as soon as possible.
- The AIX LPAR interface can elect any power mode, and related attributes, that would be offered by the ASMI.
- Delivery priority, in order, would be E880, E850, S824, and if possible P780+.