I wonder how this can be transitioned in. It seems to me that any driver that doesn't declare its latency requirement must be assumed to need the minimum possible latency. The result is that the last driver to be updated holds up implementing power-down. It's not as bad as it might be, as lots of drivers aren't even open much of the time, and most of us won't have the hardware they drive, but I wonder how we will know which driver is keeping our own machine from sleeping.
The problem seems similar to discovering which daemon is keeping the disk from ever spinning down.
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