Re: Questions about Runtime Power Management

[Oliver Neukum]

On Tuesday 11 June 2013 07:53:10 Morales, Alejandra wrote:
> 2013/6/10 Oliver Neukum <oneukum@xxxxxxx>

> > You need to furthermore realise that there are forms of runtime PM independent
> > of the generic kernel based runtime PM (hdparm, USB LPM, ...)
> 
> 
> Thanks Oliver, that was helpful. I will try now to do my testing using USB devices as it will likely be easier.

Note:

1. for most usb devices the default for runtime PM is off (powertop will help)
2. all a device's interface drivers must support it (look at the kernel source for .supports_autosuspend = 1)
3. If you want the HCD to go to D3 you need ACPI 5.0

	HTH
		Oliver

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