Patch for xcb-proto and a test program are applied.
The test program can be compiled by gcc -o dpmsnotify dpmsnotify.c -lxcb
-lxcb-dpms
>From 00f7947121181fc98cb09e4b86e14bd4738958d0 Mon Sep 17 00:00:00 2001
From: Alexander Volkov
Date: Mon, 1 Oct 2018 19:41:18 +0300
Subject: [PATCH] dpms: Add D
From: Alexander Volkov
It was introduced in DPMS 1.2 (xorgproto).
This allows applications to respond to changes of power level
of a monitor, e.g. an application may stop rendering and related
calculations when the monitor is off.
Related bug: https://bugs.freedesktop.org/57120
v2: send as gene
