linux-kernel - Re: Suspend and resume on ASUS Laptops

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Message-Id: <201112042057.11175.rjw@sisk.pl>
Date:	Sun, 4 Dec 2011 20:57:10 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Alan Stern <stern@...land.harvard.edu>
Cc:	Michal Jaegermann <michal@...pspace.math.ualberta.ca>,
	Steven Rostedt <rostedt@...dmis.org>,
	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>,
	Oliver Neukum <oneukum@...e.de>, linux-pm@...r.kernel.org,
	LKML <linux-kernel@...r.kernel.org>,
	Len Brown <len.brown@...el.com>, Pavel Machek <pavel@....cz>,
	"Greg Kroah-Hartman" <gregkh@...e.de>
Subject: Re: Suspend and resume on ASUS Laptops

On Sunday, December 04, 2011, Alan Stern wrote:
> On Sat, 3 Dec 2011, Michal Jaegermann wrote:
> 
> > On Sat, Dec 03, 2011 at 10:19:27AM -0500, Alan Stern wrote:
> > > On Fri, 2 Dec 2011, Michal Jaegermann wrote:
> > > > 
> > > > On my ASUS K52Jc these controllers are also reported "disabled".  This
> > > 
> > > What exactly do you mean by that?
> > 
> > I mean that you asked Steven about a content of
> > /sys/bus/pci/devices/0000\:00\:1[ad].0/power/wakeup
> > On my ASUS K52Jc these ids also happen to belong to ehci_hcd devices
> > (both "Intel Corporation 5 Series/3400 Series Chipset USB2 Enhanced Host
> > Controller") and both 'wakeup' files show "disabled" too.
> 
> Oh, sorry -- I didn't realize you meant the power/wakeup file contained 
> "disabled".  It sounded like you were saying that the controllers were 
> somehow disabled.
> 
> > With that above I have to do all these manipulations with unbinding
> > and binding drivers and removing inserting modules or a laptop will hang
> > after a suspend.  Now with a recent kernel I need additionally put
> > wireless driver modules on a "special handling" list or I will loose
> > such connection (no hang here, just a dead driver).
> > 
> > All of this looks like pretty consistent, from what one can find on the
> > net, across various models of ASUS laptops.
> 
> Yes, apparently ASUS's recent chipsets or firmware has a problem with
> suspend and resume.  On the other hand, I'm writing this on an ASUS
> UL20A laptop, which suspends and resumes with no difficulty.

I wonder, though, who figured out what quirk to use before suspend on those
particular machines and on what basis (some information from the vendor or
what?).

Thanks,
Rafael
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