From: Oliver Neukum <oneukum@suse.de>
To: "Morales, Alejandra" <alejandra.morales@tum.de>
Cc: "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: Questions about Runtime Power Management
Date: Tue, 11 Jun 2013 10:21:37 +0200 [thread overview]
Message-ID: <6962070.dqPY4e5mso@linux-5eaq.site> (raw)
In-Reply-To: <9E3F9C2076C45D4783F09B90D5BE77CE171D3B@BADWLRZ-SWMBX14.ads.mwn.de>
On Tuesday 11 June 2013 07:53:10 Morales, Alejandra wrote:
> 2013/6/10 Oliver Neukum <oneukum@suse.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
next prev parent reply other threads:[~2013-06-11 8:20 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-06-09 16:28 Questions about Runtime Power Management Morales, Alejandra
2013-06-10 8:39 ` Oliver Neukum
2013-06-11 7:53 ` Morales, Alejandra
2013-06-11 8:21 ` Oliver Neukum [this message]
2013-06-16 15:07 ` Ming Lei
2013-06-16 22:15 ` Oliver Neukum
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