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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <73029405.6ZXyByzer1@aspire.rjw.lan>
Date:   Mon, 06 Aug 2018 11:37:05 +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 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?