From 896562580fe65913832e01674544b48e377d6339 Mon Sep 17 00:00:00 2001
From: Marc Ferland <marc.ferland@sonatest.com>
Date: Wed, 5 Nov 2025 10:10:09 -0500
Subject: [PATCH] kwin: allow kwin to set real-time thread priotiry

KWin supports setting RT thread priorities to improve rendering and
input processing speed when the system is under load for example. It
should also result in a smoother experience in general.

As an added bonus, we also get rid of this warning:

kwin_wayland_wrapper[1016]: Failed to gain real time thread priority (See CAP_SYS_NICE in the capabilities(7) man page). error: Operation not permitted

See: https://blog.martin-graesslin.com/blog/2017/09/kwinwayland-goes-real-time/

Signed-off-by: Marc Ferland <marc.ferland@sonatest.com>
---
 recipes-plasma/kwin.inc | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/recipes-plasma/kwin.inc b/recipes-plasma/kwin.inc
index db01469..6423592 100644
--- a/recipes-plasma/kwin.inc
+++ b/recipes-plasma/kwin.inc
@@ -36,6 +36,7 @@ DEPENDS:class-target = " \
     kxmlgui \
     lcms \
     libdisplay-info \
+    libcap \
     libei \
     libinput \
     libplasma \
@@ -88,6 +89,11 @@ do_install:append() {
     install -m 644 ${UNPACKDIR}/kwinrc ${D}/${sysconfdir}/xdg/kwinrc
 }
 
+pkg_postinst:${PN} () {
+	setcap cap_sys_nice+ep "$D/${bindir}/kwin_wayland"
+}
+PACKAGE_WRITE_DEPS += "libcap-native"
+
 FILES_SOLIBSDEV = ""
 FILES:${PN} += " \
     ${datadir}/config.kcfg/*.kcfg \