Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752406Ab3FKIUS (ORCPT ); Tue, 11 Jun 2013 04:20:18 -0400 Received: from cantor2.suse.de ([195.135.220.15]:35503 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751700Ab3FKIUQ (ORCPT ); Tue, 11 Jun 2013 04:20:16 -0400 From: Oliver Neukum To: "Morales, Alejandra" Cc: "linux-kernel@vger.kernel.org" Subject: Re: Questions about Runtime Power Management Date: Tue, 11 Jun 2013 10:21:37 +0200 Message-ID: <6962070.dqPY4e5mso@linux-5eaq.site> Organization: SUSE User-Agent: KMail/4.10.3 (Linux/3.7.10-1.11-desktop; KDE/4.10.4; x86_64; ; ) In-Reply-To: <9E3F9C2076C45D4783F09B90D5BE77CE171D3B@BADWLRZ-SWMBX14.ads.mwn.de> References: <9E3F9C2076C45D4783F09B90D5BE77CE16B4E6@BADWLRZ-SWMBX13.ads.mwn.de> <8961845.QtBW1c5NsD@linux-5eaq.site> <9E3F9C2076C45D4783F09B90D5BE77CE171D3B@BADWLRZ-SWMBX14.ads.mwn.de> MIME-Version: 1.0 Content-Transfer-Encoding: 7Bit Content-Type: text/plain; charset="us-ascii" Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 884 Lines: 23 On Tuesday 11 June 2013 07:53:10 Morales, Alejandra wrote: > 2013/6/10 Oliver Neukum > > 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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/