linux-kernel - Re: [RFC PATCH v1 0/1] ACPI: s2idle: Add /sys/power/lps0_screen

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Message-ID: <aTLfc+NT/OVUR/vZ@duo.ucw.cz>
Date: Fri, 5 Dec 2025 14:34:43 +0100
From: Pavel Machek <pavel@....cz>
To: Dmitry Osipenko <dmitry.osipenko@...labora.com>
Cc: "Rafael J. Wysocki" <rafael@...nel.org>,
	Mario Limonciello <superm1@...nel.org>,
	Robert Beckett <bob.beckett@...labora.com>,
	linux-acpi@...r.kernel.org, kernel@...labora.com,
	linux-kernel@...r.kernel.org,
	Sebastian Reichel <sebastian.reichel@...labora.com>,
	Xaver Hugl <xaver.hugl@...il.com>,
	Richard Hughes <richard@...hsie.com>,
	William Jon McCann <mccann@....edu>,
	"Jaap A . Haitsma" <jaap@...tsma.org>,
	Benjamin Canou <bookeldor@...il.com>,
	Bastien Nocera <hadess@...ess.net>,
	systemd-devel@...ts.freedesktop.org,
	Lennart Poettering <lennart@...ttering.net>,
	Antheas Kapenekakis <lkml@...heas.dev>
Subject: Re: [RFC PATCH v1 0/1] ACPI: s2idle: Add /sys/power/lps0_screen_off

Hi!

> Introduce the `/sys/power/lps0_screen_off` sysfs interface, enabling
> userspace control over ACPI LPS0 Display Off/On notifications [1].
> 
> These notifications are a part of a Modern Standby [2]. The Display Off
> notification signals the firmware when all displays (physical and remote)
> are off, allowing it to enter lower power states that makes device pretend
> it has been suspended while the system remains operational.

What is "remote" display? Remote desktop? ssh connection?

This needs better name. If it enables powersaving in exchange for
100msec latency, for example, it should say that. I'm pretty sure it
will be useful elsewhere, and all the world is not ACPI.

BR,
								Pavel

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