unused patch

0001-platforms-X11-Disable-VSync-for-QtQuick-Windows.patch

@@ -1,81 +0,0 @@
-From 0124b1ef191fcafe0d0f89287be66b36833586e6 Mon Sep 17 00:00:00 2001
-From: Erik Kurzinger <ekurzinger@nvidia.com>
-Date: Wed, 19 Jun 2019 07:56:42 -0700
-Subject: [PATCH] [platforms/X11] Disable VSync for QtQuick Windows
-
-Summary:
-QtQuick windows created by KWin currently use the default swap interval
-of 1, meaning buffer swaps will block until vblank. However, this
-results in a problematic interaction on hybrid graphics systems running
-the proprietary NVIDIA driver.  VSync on such setups relies on a system
-called "PRIME synchronization", where the xf86-video-modesetting driver
-controlling the display will signal the NVIDIA driver when vblank has
-occurred. The issue is that it will only do so if there has been damage
-to the screen.
-
-So, when KWin creates a QtQuick window, compositing will stop waiting on
-the window to render, therefore no damage to the screen will occur. But
-this means that no vblank notifications will be delivered to the NVIDIA
-driver, so the glXSwapBuffers call by the QtQuick window will block
-perpetually. The end result is a freeze of the desktop.
-
-To get around this, we can simply disable vsync for QtQuick windows by
-setting the swap interval for the default QSurfaceFormat to 0. Since
-they are redirected, this shouldn't cause any tearing.
-
-BUG: 406180
-FIXED-IN: 5.16.2
-
-Test Plan:
-Using the proprietary NVIDIA driver on a hybrid graphics system, with
-PRIME synchronization enabled (see
-https://devtalk.nvidia.com/default/topic/957814/linux/prime-and-prime-synchronization/),
-perform any action causing a QtQuick window to be created by KWin, for
-example, triggering the application switcher dialogue with alt + tab.
-
-Ensure the desktop does not temporarily freeze.
-
-Note, this required a Qt build that includes commit
-https://code.qt.io/cgit/qt/qtbase.git/commit/?id=0c1831178540462da31fd7a4b6d2e446bc84498b
-resolving a bug that prevented the changing the swap interval.
-
-Reviewers: #kwin, davidedmundson, zzag
-
-Reviewed By: #kwin, davidedmundson, zzag
-
-Subscribers: zzag, romangg, alexeymin, kwin
-
-Tags: #kwin
-
-Differential Revision: https://phabricator.kde.org/D21808
----
- main_x11.cpp | 6 ++++++
- 1 file changed, 6 insertions(+)
-
-diff --git a/main_x11.cpp b/main_x11.cpp
-index c83b8240b..1219337b6 100644
---- a/main_x11.cpp
-+++ b/main_x11.cpp
-@@ -43,6 +43,7 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
- #include <QFile>
- #include <QLabel>
- #include <QPushButton>
-+#include <QSurfaceFormat>
- #include <QVBoxLayout>
- #include <QX11Info>
- 
-@@ -417,6 +418,11 @@ KWIN_EXPORT int kdemain(int argc, char * argv[])
-     KWin::Application::createAboutData();
-     KQuickAddons::QtQuickSettings::init();
- 
-+    // disables vsync for any QtQuick windows we create (BUG 406180)
-+    QSurfaceFormat format = QSurfaceFormat::defaultFormat();
-+    format.setSwapInterval(0);
-+    QSurfaceFormat::setDefaultFormat(format);
-+
-     QCommandLineOption replaceOption(QStringLiteral("replace"), i18n("Replace already-running ICCCM2.0-compliant window manager"));
- 
-     QCommandLineParser parser;
--- 
-2.21.0
-