linux-kernel - Re: Question about failure in PCI power-state change

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Date:	Sat, 8 Sep 2012 17:50:18 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
cc:	Larry Finger <Larry.Finger@...inger.net>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	<linux-pci@...r.kernel.org>, LKML <linux-kernel@...r.kernel.org>,
	李朝明 
	<chaoming_li@...lsil.com.cn>,
	Linux PM list <linux-pm@...r.kernel.org>,
	Huang Ying <ying.huang@...el.com>
Subject: Re: Question about failure in PCI power-state change

On Sat, 8 Sep 2012, Rafael J. Wysocki wrote:

> On Saturday, September 08, 2012, Bjorn Helgaas wrote:
> > +cc Rafael, Huang, linux-pm
> > 
> > On Fri, Sep 7, 2012 at 3:44 PM, Larry Finger <Larry.Finger@...inger.net> wrote:
> > > Hi,
> > >
> > > On occasion when I unload and reload driver rtl8192ce, I get the message
> > >
> > > "Refused to change power state, currently in D3"
> > >
> > > I added additional info to the printk and discovered that it was trying to
> > > change to state D0. The problem seems to occur when I have made a
> > > connection, unloaded the driver, and reloaded it. If I do not make a
> > > connection before unloading, then the problem is a lot less likely.
> > >
> > > This is with kernel 3.6-rc4 from wireless-testing. A Google search shows
> > > that the problem is usually due to suspend/resume difficulties, but this
> > > machine has not been suspended.
> > >
> > > I would appreciate any help that you might give in solving this issue.
> 
> I think writing "on" to the /sys/devices/.../power/control attribute of the device
> in question would help.

Are you suggesting that this particular wireless adapter is unable to 
return to D0 from D3?

Larry, what happens if you try the suspend & resume your system while 
there's a connection?  Does a similar error occur during the resume?

Alan Stern

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