Live Q&A - Power Management on Linux: From the Hardware to the Kernel and User Space Interfaces

Really great presentation! The last line of the summary is really worth emphasizing:
"Power management is a system-wide challenge and requires a holistic approach!"
It certainly does! As well as the software, there needs to be hardware support for example to switch external regulators or devices and clocks off to reduce consumption, and the product may need heat dissipation strategies to avoid the kernel thermal management acting to throttle CPU and GPU and thus render the user experience unacceptable. It can be a very painful lesson to learn.