Disable all but one X outputs

Sugar cannot deal properly with multiple outputs.

3 files changed, 52 insertions, 1 deletions

diff --git a/scripts/check-system b/scripts/check-system
index e904e7c..e57bba3 100755
--- a/scripts/check-system
+++ b/scripts/check-system
@@ -80,6 +80,12 @@ libs = [{ "name": "python2",
         { "name": "pycairo",
           "packages": { "fedora": "pycairo-devel",
                         "ubuntu": "python-cairo-dev" } },
+        { "name": "xrandr", # list-displays
+          "packages": { "fedora": "libXrandr-devel",
+                        "ubuntu": "libxrandr-dev" } },
+        { "name": "x11", # list-displays
+          "packages": { "fedora": "libX11-devel",
+                        "ubuntu": "libx11-dev" } },
         { "name": "icon-naming-utils",
           "packages": { "fedora": "icon-naming-utils",
                         "ubuntu": "icon-naming-utils" } }]
diff --git a/scripts/list-outputs.c b/scripts/list-outputs.c
new file mode 100644
index 0000000..f2c3f0b
--- /dev/null
+++ b/scripts/list-outputs.c
@@ -0,0 +1,31 @@
+#include <stdio.h>
+#include <X11/extensions/Xrandr.h>
+
+int main(int argc, char **argv)
+{
+    Display *dpy = XOpenDisplay(NULL);
+    XRRScreenResources *rr;
+    XRROutputInfo *output;
+    int i;
+
+    XSynchronize(dpy, 1);
+
+    rr = XRRGetScreenResources(dpy, DefaultRootWindow(dpy));
+
+    for (i = 0; i < rr->noutput; i++) {
+	    output = XRRGetOutputInfo(dpy, rr, rr->outputs[i]);
+
+        if (output->connection == RR_Connected) {
+            printf("%s\n", output->name);
+        }
+
+        XRRFreeOutputInfo(output);
+    }
+
+    XRRFreeScreenResources(rr);
+
+    XSync(dpy, 1);
+    XCloseDisplay(dpy);
+
+    return 0;
+}
diff --git a/scripts/xinitrc b/scripts/xinitrc
index 23dce95..90927bf 100644
--- a/scripts/xinitrc
+++ b/scripts/xinitrc
@@ -5,6 +5,20 @@ unset GNOME_KEYRING_PID
 
 SCRIPTS_DIR=`dirname "$0"`
 ROOT_DIR=`dirname "$SCRIPTS_DIR"`
-RUN_COMMAND="dbus-launch --exit-with-session sugar"
 
+# Sugar doesn't handle multiple outputs properly. To avoid issues we keep the
+# first output in the list returned by xrandr and turn off everything else.
+
+OUTPUTS=`scripts/list-outputs`
+
+for output in $OUTPUTS
+do
+   if [ -z "$FIRST_OUTPUT" ]; then
+       FIRST_OUTPUT=$output
+   else
+       xrandr --output $output --off
+   fi
+done
+
+RUN_COMMAND="dbus-launch --exit-with-session sugar"
 $ROOT_DIR/build/bin/jhbuild -f $ROOT_DIR/scripts/jhbuildrc run $RUN_COMMAND