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

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Message-Id: <201209082229.01465.rjw@sisk.pl>
Date:	Sat, 8 Sep 2012 22:29:01 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Larry Finger <Larry.Finger@...inger.net>
Cc:	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 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.

Thanks,
Rafael
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