linux-kernel - Re: pm_op(): usb_dev_suspend+0x0/0x10 returns -2 on USB device 8087:0020

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Date:	Thu, 25 Feb 2010 18:07:45 +0100
From:	Ákos Maróy <akos@...oy.hu>
To:	Alan Stern <stern@...land.harvard.edu>
CC:	"Rafael J. Wysocki" <rjw@...k.pl>,
	Kernel development list <linux-kernel@...r.kernel.org>,
	Greg KH <gregkh@...e.de>, USB list <linux-usb@...r.kernel.org>
Subject: Re: pm_op(): usb_dev_suspend+0x0/0x10 returns -2 on USB device 8087:0020

Alan,

> By the way, I noticed above that you have xhci-hcd installed.  As far 
> as I know, that driver does not yet support system suspend.  You should 
> try unloading xhci-hcd before doing the suspend (both with and without 
> CONFIG_USB_DEBUG).

as I added xhci among the SUSPEND_MODULES for pm, I tried pm-hibernate
after a successful pm-suspend. but this doesn't work, the machine just
goes blank, and it doesn't power off. doing a power cycle boots it 'as
usual'.

how can one debug the hibernation process?


Akos

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