fix bug when hotplugging a monitor causes oops

0001-config-udev-ignore-change-on-drm-devices.patch

@@ -0,0 +1,41 @@
+From 6d9beff6ce231527dfd59e896c6cf3730555121a Mon Sep 17 00:00:00 2001
+From: Dave Airlie <airlied@gmail.com>
+Date: Thu, 13 Sep 2012 18:44:06 +1000
+Subject: [PATCH] config/udev: ignore change on drm devices
+
+for input devices we handle change like remove/add, but for
+drm devices we get change events when we hotplug outputs,
+so lets just ignore change at this level, and let the drivers
+handle it. We may in the future want to route driver udev
+from here instead.
+
+Reported-by: Timo Aaltonen <timo.aaltonen@canonical.com>
+Signed-off-by: Dave Airlie <airlied@redhat.com>
+---
+ config/udev.c |    8 +++++++-
+ 1 file changed, 7 insertions(+), 1 deletion(-)
+
+diff --git a/config/udev.c b/config/udev.c
+index c2d00bb..454838f 100644
+--- a/config/udev.c
++++ b/config/udev.c
+@@ -300,9 +300,15 @@ wakeup_handler(pointer data, int err, pointer read_mask)
+             return;
+         action = udev_device_get_action(udev_device);
+         if (action) {
+-            if (!strcmp(action, "add") || !strcmp(action, "change")) {
++            if (!strcmp(action, "add")) {
+                 device_removed(udev_device);
+                 device_added(udev_device);
++            } else if (!strcmp(action, "change")) {
++                /* ignore change for the drm devices */
++                if (strcmp(udev_device_get_subsystem(udev_device), "drm")) {
++                    device_removed(udev_device);
++                    device_added(udev_device);
++                }
+             }
+             else if (!strcmp(action, "remove"))
+                 device_removed(udev_device);
+-- 
+1.7.10.2
+