> This wouldn't work for systems with builtin hubs (not the
> root hub) and
> just doesn't seem very intuitive to me.
>
> I'm not super familiar with the steps ACPI goes through to
> suspend, but
> don't we have a warning that a suspend is about to happen and
> we can do
> things?
>
> Wouldn't this be a better time to suspend the HC?
I am not talking about suspending the HC when the system is suspended, I am
talking about suspending the HC when *the system is running* and no devices
are attached.
Why bother? Because running the HC even with nothing attached prevents ACPI
from putting the CPU into deep sleep (C3) when idle. The HC is not only
wasting power, it is causing the CPU to waste power.
We will also want to suspend the HC (even with devices attached) when the
system goes to sleep, but I was focussing on the other issue first.
I am not a USB expert -- how would builtin hubs complicate things?
Regards -- Andy
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