linux-kernel - Re: Changes in sleep mode, on x86 PC

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Date:	Tue, 29 Mar 2016 16:00:09 +0200
From:	Oliver Neukum <oneukum@...e.com>
To:	"Rafael J. Wysocki" <rjw@...ysocki.net>
Cc:	Pavel Machek <pavel@....cz>,
	kernel list <linux-kernel@...r.kernel.org>, lenb@...nel.org,
	linux-acpi@...r.kernel.org,
	Linux PM list <linux-pm@...r.kernel.org>,
	Jiri Kosina <jikos@...nel.org>
Subject: Re: Changes in sleep mode, on x86 PC

On Tue, 2016-03-29 at 15:06 +0200, Rafael J. Wysocki wrote:
> On Monday, March 28, 2016 11:20:12 PM Pavel Machek wrote:
> > Hi!
> > 
> > Few releases ago, I could wake up PC from S3 sleep by hitting any
> > key. That ceased to work some time before, keyboard would just light a
> > NUM lock LED when I hit a key (4.5). Now PC seems to be sleeping (in
> > S3) with NUM lock LED on (4.6-rc0).
> > 
> > Any idea what is going on there? Does it happen for you, too? What is
> > the expected behaviour?
> >
> > Debian 8.3, with MATE desktop, I just hit the "moon" key to make it
> > sleep. Keyboard is on USB.
> 
> That's rather important.
> 
> Clearly, something in the USB HID land has changed lately.

Not necessarily. ACPI may also be the root cause.

> The expected behavior depends on whether or not the keyboard itself and the
> USB controller are both enabled to wake up.  If they are, I'd expect any
> key press to generate a wakeup event.

What does /proc/acpi/wakeup say?

	Regards
		Oliver