xwayland: Disable the MIT-SCREEN-SAVER extension when rootless

Xwayland is just a Wayland client, no X11 screensaver should be
expected to work reliably on Xwayland when running rootless because
Xwayland cannot grab the input devices so it has no way to actually
lock the screen managed by the Wayland compositor.

Turn off the screensaver on Xwayland when running rootless by setting
the screensaver timeout and interval and their default values to zero
and disable the MIT-SCREEN-SAVER extension.

Closes: https://gitlab.freedesktop.org/xorg/xserver/-/issues/1051
Signed-off-by: Olivier Fourdan <ofourdan@redhat.com>
Reviewed-by: Michel Dänzer <mdaenzer@redhat.com>
Reviewed-by: Peter Hutterer <peter.hutterer@who-t.net>

1 files changed, 13 insertions, 0 deletions

diff --git a/hw/xwayland/xwayland-screen.c b/hw/xwayland/xwayland-screen.c
index d248a3901..92643c0ed 100644
--- a/hw/xwayland/xwayland-screen.c
+++ b/hw/xwayland/xwayland-screen.c
@@ -575,6 +575,19 @@ xwl_screen_init(ScreenPtr pScreen, int argc, char **argv)
     for (i = 1; i < argc; i++) {
         if (strcmp(argv[i], "-rootless") == 0) {
             xwl_screen->rootless = 1;
+
+            /* Disable the XSS extension on Xwayland rootless.
+             *
+             * Xwayland is just a Wayland client, no X11 screensaver
+             * should be expected to work reliably on Xwayland rootless.
+             */
+#ifdef SCREENSAVER
+            noScreenSaverExtension = TRUE;
+#endif
+            ScreenSaverTime = 0;
+            ScreenSaverInterval = 0;
+            defaultScreenSaverTime = 0;
+            defaultScreenSaverInterval = 0;
         }
         else if (strcmp(argv[i], "-shm") == 0) {
             xwl_screen->glamor = 0;