[linux-pm] ehci_hcd related S3 lockup on ASUS laptops, again

Alan Stern stern at rowland.harvard.edu
Sat Apr 21 17:26:44 UTC 2012

On Sat, 21 Apr 2012, Andrey Rahmatullin wrote:

> On Fri, Apr 20, 2012 at 08:42:03PM -0400, Alan Stern wrote:
> > > > I'd like to see the dmesg log for the complete suspend/resume cycle 
> > > > (naturally you'll have to resume the system by hand after plugging in 
> > > > the USB device).  Make sure that CONFIG_USB_DEBUG is enabled.
> > > Attached.
> > 
> > It looks quite normal.  Evidently USB wakeup does _not_ work on your 
> > system when the controller isn't in D3 -- and the system crashes during 
> > suspend if the controller _is_ in D3!
> > 
> > (Does anybody know if USB wakeup works on these machines under
> > Windows?)
> Out of the box it doesn't work and "Allow this device to wake up the
> computer" checkboxes on both root hubs are unchecked and grayed out.

Ha!  It seems that nobody knows how to make it work.

> > What about runtime wakeup?  You can test it easily enough.  Write 
> > "auto" to the power/control attribute for the two controllers.  This 
> > should cause the controllers (or at least one of them) to go into 
> > runtime suspend.  Does it then wake up when you plug in a USB device?
> I wrote 'auto' to both power/control, both power/runtime_status became
> 'suspended', I plugged in a device, one of power/runtime_status became
> 'active'.

Okay, that's good.  I assume the device you plugged in then functioned

Alan Stern

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