Patrick has shared the following presentation at the Embedded Linux Conference in Edinburgh.
Here is an outline:
Wireless Embedded platforms performances keep increasing (multi-core processors (MPU / GPU) up to 2GHz+, H/W accelerators, High-Speed RAM (LPDDR3, Wide I/O) & peripheral buses (USB3)). But power and thermal budgets remain roughly the same (mobile phone: ~5W, case temperature < 45oC, 1-day of active use). Hence, Power Management becomes the critical element.
http://www.slideshare.net/baylibre/use-case-power-management-optimization-elce-presentation