Comment 5 for bug 420308

Updated version:

#include <X11/extensions/Xcomposite.h>
#include <gdk/gdk.h>
#include <gdk/gdkx.h>

// gcc -g intel.c -o intel-test `pkg-config --cflags gtk+-2.0 gdk-2.0` `pkg-config --libs gtk+-2.0 gdk-2.0`

int main(int argc, char *argv[])
{
    gdk_init(&argc, &argv);

    while(1)
    {
        GdkScreen *default_gdk_screen = gdk_screen_get_default();

        if (!default_gdk_screen)
            return 0;

        printf("%s\n", gdk_x11_screen_get_window_manager_name(default_gdk_screen));

        gtk_main_iteration_do (FALSE);
    }
}

It seems that "gdk_x11_screen_get_window_manager_name" actually works, but takes too long to switch and the 8s timeout kicks in. I've also installed 1:2.26.0-1ubuntu4 and it is the first version that shows this behaviour.