linux-kernel - Re: [PATCH] i8042 / PM: Allow PC keyboard to wake up from suspend-to-idle

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Date:	Mon, 09 Mar 2015 23:41:12 +0100
From:	"Rafael J. Wysocki" <rjw@...ysocki.net>
To:	Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc:	Kristen Carlson Accardi <kristen@...ux.intel.com>,
	Linux PM list <linux-pm@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-input@...r.kernel.org
Subject: Re: [PATCH] i8042 / PM: Allow PC keyboard to wake up from suspend-to-idle

On Monday, March 09, 2015 11:00:04 AM Dmitry Torokhov wrote:
> Hi Rafael,
> 
> On Mon, Mar 09, 2015 at 04:19:50PM +0100, Rafael J. Wysocki wrote:
> > From: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> > 
> > If they keyboard interrupt is registered, mark the i8042 platform
> > device as wakeup-capable and check the user space wakeup setting in
> > i8042_pm_suspend() and i8042_pm_resume() to enable or disable,
> > respectively, the keyboard interrupt to wake up the system.
> > 
> > This makes it possible to use the PC keyboard to wake up the system
> > from suspend-to-idle after writing "enabled" to the i8042 device's
> > power/wakeup sysfs attribute.
> 
> Why do we do that for KBD but not AUX port? Should we mark individual
> serio port be wakeup capable and not the whole i8042.

We can do that, but only after the port serio device has been registered.

I guess I can add code for that to i8042_register_ports().  Let me try that.

> Also, why exactly is this needed? My laptops seem to resume just fine
> from keyboard activity without this patch...

Mine don't.  At least not from suspend-to-idle ("echo freeze > /sys/power/state").

Whether or not the PC keyboard wakes them up from suspend-to-RAM depends on the
BIOS.  That only works for one of my laptops, but this patch doesn't help here.

Rafael

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