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Date: Wed, 16 Feb 2011 09:57:35 -0500 (EST)
From: Alan Stern <stern@rowland.harvard.edu>
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To: "Rafael J. Wysocki" <rjw@sisk.pl>
cc: Linux-pm mailing list <linux-pm@lists.linux-foundation.org>,
        Kevin Hilman <khilman@ti.com>,
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        Magnus Damm <magnus.damm@gmail.com>, Len Brown <lenb@kernel.org>,
        Mark Brown <broonie@opensource.wolfsonmicro.com>
Subject: Re: [RFC][PATCH 2/2] PM: Make system-wide PM and runtime PM handle
 subsystems consistently
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On Wed, 16 Feb 2011, Rafael J. Wysocki wrote:

> Unfortunately, it doesn't work on my Acer Ferrari One.  The problem is that
> hcd_pci_suspend() fails for the EHCI controller, apparently because the root
> hub is not suspended.  Do root hubs need both class suspend and bus type
> suspend to work at the same time?

No, only the bus type suspend method is needed.  Can you provide the
dmesg log using a kernel built with CONFIG_USB_DEBUG?

Alan Stern