Re: ehci_hcd related S3 lockup on ASUS laptops, again

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On Wed, 18 Apr 2012, Mark Brown wrote:

> On Wed, Apr 18, 2012 at 01:24:07PM -0400, Steven Rostedt wrote:
> 
> > Hmm, if the system is going down into suspend, what's the purpose of
> > putting the individual devices into low-power states. The entire system
> > will become a low-power state once it hits suspend, wont it?
> 
> Embedded platforms tend to rely on drivers doing this, either because
> the system suspend just suspends a portion of the system or because
> suspending the core on the system relies on the devices having being
> quiesced (or a combination of both).

Right.  One reasonable workaround might be simply to avoid putting PCI 
devices into D3 before suspend if the system uses ACPI.  But I don't 
know if that would interfere with the wakeup mechanism.

On the whole, it seems like a better idea to treat this particular 
chipset specially.

Alan Stern

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