linux-kernel - Re: [regression 3.15-rc3] Resume from s4 broken by 1f81b6d22a5980955b01e08cf27fb745dc9b686f

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Date:	Mon, 5 May 2014 12:32:22 -0700
From:	Julius Werner <jwerner@...omium.org>
To:	Ville Syrjälä <ville.syrjala@...ux.intel.com>
Cc:	Julius Werner <jwerner@...omium.org>,
	Mathias Nyman <mathias.nyman@...ux.intel.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [regression 3.15-rc3] Resume from s4 broken by 1f81b6d22a5980955b01e08cf27fb745dc9b686f

Hmmm... very odd. I unfortunately don't have a machine that can easily
do S4 at hand, but I did test this on an IVB with XHCI_RESET_ON_RESUME
in S3 (essentially the same code path), and I didn't run into any
problems.

How exactly does your machine fail on resume? Is it a kernel crash or
just a hang? Can you try getting some debug output (by setting 'echo N
> /sys/module/printk/parameters/console_suspend' and trying to catch
the crash on the screen or a serial line, or maybe through pstore)? I
really don't see much that could go wrong with this patch, so without
more info it will be hard to understand your problem.

Also, I noticed that you have two HID devices plugged in during
suspend. Does it make a difference if you have different devices (e.g.
a mass storage stick) or none at all?
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