On Mon, Oct 22, 2018 at 06:19:01AM -0400, Sasha Levin wrote:
From: Daniel Drake <drake@xxxxxxxxxxxx>
[ Upstream commit 684bec1092b6991ff2a7751e8a763898576eb5c2 ]
Previously, on typical consumer laptops, pressing a key on the keyboard
when the system is in suspend would cause it to wake up (default or
unconditional behaviour). This happens because the EC generates a SCI
interrupt in this scenario.
That is no longer true on modern laptops based on Intel WhiskeyLake,
including Acer Swift SF314-55G, Asus UX333FA, Asus UX433FN and Asus
UX533FD. We confirmed with Asus EC engineers that the "Modern Standby"
design has been modified so that the EC no longer generates a SCI
in this case; the keyboard controller itself should be used for wakeup.
In order to retain the standard behaviour of being able to use the
keyboard to wake up the system, enable serio wakeups by default on
platforms that are using s2idle.
I disagree that this should be included in stable as it does not fix a
regression on the aforementioned platforms and has a potential to alter
the behavior. The fact that the system does not wake up on keyboard is
not a showstopper, wakeup usually happens on lid open anyway.
It is hitting 4.19 LTS train and that should be enough. Please do not
pick up for earlier stables.