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

From: Rafael J. Wysocki
Date: Mon Mar 09 2015 - 18:17:37 EST

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@xxxxxxxxx>
> >
> > 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.


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