linux-kernel - Re: Questions about Runtime Power Management

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Message-ID: <6962070.dqPY4e5mso@linux-5eaq.site>
Date:	Tue, 11 Jun 2013 10:21:37 +0200
From:	Oliver Neukum <oneukum@...e.de>
To:	"Morales, Alejandra" <alejandra.morales@....de>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: Questions about Runtime Power Management

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

> > 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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