[PATCH v3 0/8] PM / ACPI / i2c: Deploy runtime PM centric path for system sleep

[Lukas Wunner]

On Mon, Sep 04, 2017 at 02:17:21AM +0200, Rafael J. Wysocki wrote:
> OTOH I'm starting to think that direct_complete is only theoretically
> useful and may not be actually set very often in practice, whereas it
> adds significant complexity to the code, so I'm not sure about it any
> more.

That makes me come out of the woodwork as a direct_complete fan:

Runtime resuming a discrete GPU on a modern dual GPU laptop takes about
1.5 sec, runtime resuming Thunderbolt controllers more than 2 sec.
A discrete GPU easily consumes 10W, a Thunderbolt controller 2W.

So not having direct_complete would noticeably delay system suspend and
resume as well as reduce battery life.

Lukas