drm/i915: generate a KMS uevent at lid open/close time

With all the other lid pieces in place, it's easy to generate a uevent
for the LVDS connector just like we do for other outputs.  Should make
lid open/close fit in with the rest of a userland based output
reconfiguration scheme.
Signed-off-by: NJesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: NEric Anholt <eric@anholt.net>

drivers/gpu/drm/i915/intel_lvds.c

@@ -649,6 +649,8 @@ static int intel_lid_notify(struct notifier_block *nb, unsigned long val,
 	if (acpi_lid_open())
 		drm_helper_resume_force_mode(dev);
 
+	drm_sysfs_hotplug_event(dev_priv->dev);
+
 	return NOTIFY_OK;
 }