linux-kernel - Re: Built in PS2 keyboard in new ASUS/acer laptops can not wake up system after s2idle

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Message-ID: <1631276.bMiRmflJ7r@aspire.rjw.lan>
Date:   Mon, 06 Aug 2018 13:17:26 +0200
From:   "Rafael J. Wysocki" <rjw@...ysocki.net>
To:     Chris Chiu <chiu@...lessm.com>
Cc:     Dmitry Torokhov <dmitry.torokhov@...il.com>,
        linux-input <linux-input@...r.kernel.org>,
        linux-pm@...r.kernel.org,
        Linux Kernel <linux-kernel@...r.kernel.org>,
        Linux Upstreaming Team <linux@...lessm.com>
Subject: Re: Built in PS2 keyboard in new ASUS/acer laptops can not wake up system after s2idle

On Monday, August 6, 2018 1:07:25 PM CEST Chris Chiu wrote:
> On Mon, Aug 6, 2018 at 5:37 PM, Rafael J. Wysocki <rjw@...ysocki.net> wrote:
> > On Friday, August 3, 2018 10:04:09 AM CEST Chris Chiu wrote:
> >> Hi guys,
> >>     We have some new laptops with Intel new Intel WiskyLake CPU come
> >> in and they all have the same problem. They all have the so-called
> >> "Modern Standby" feature which is s2idle in Linux.
> >>
> >>     The problem is the built-in keyboard no longer wake up the system
> >> after it goes to s2idle. Only the power button can wake up. It's
> >> different from the other laptops with old Intel CPUs (CoffeeLake,
> >> KaybeLake...etc). We found the difference is that the EC (embedded
> >> controller) no longer signals SCI event when in s2idle.
> >>
> >>     Confirmed with ASUS EC engineer, he also admits that the EC code
> >> for signaling SCI event in modern standby has been removed on
> >> WiskyLake models. Because the built-in PS2 keyboard can still wake up
> >> the system on WisksyLake+Windows10 RS4 combination without EC
> >> intervention.
> >>
> >>     Based on this information, we suspect that maybe the built-in
> >> keyboard wakeup on Windows 10 RS4 in enabled by default (although we
> >> don't know how to prove that). It's easy to simply do
> >> 'device_set_wakeup_enable' and 'enable_irq_wake' for the i8042
> >> keyboard port to wake up the system without EC, but it's nasty.
> >>
> >>     Any suggestion about how to achieve the keyboard wake up function
> >> on these new laptops in a generic way? Thanks
> >
> > What about echoing "enabled" to the keyboard's power/wakeup file in sysfs?
> >
> 
> 'echo enabled > /sys/devices/platform/i8042/serio0/power/wakeup' can get the
> keyboard wake up the system as expected. We considered to work out a DMI
> based quirk for this. But based on the information that EC would not signal SCI
> event for WiskyLake models, we'd like to know if there's any generic solution?
> Maybe a 'udev' rule to identify WiskyLake NoteBook then enable the keyboard
> wake up?

A udev rule sounds like a good idea to me.