diff --git a/schange.c b/schange.c
index 869f4c7..08e67a4 100644
--- a/schange.c
+++ b/schange.c
@@ -1,9 +1,11 @@
 /*
-	schange.c : run command on screen change events from RandR.
-	(C)2015 Marisa Kirisame, UnSX Team. For personal use mostly.
+	schange.c : run command on crtc and output change events from RandR.
+	(C)2015-2017 Marisa Kirisame, UnSX Team. For personal use mostly.
 	Released under the GNU GPLv3 (or any later version).
 	Please refer to <https://gnu.org/licenses/gpl.txt> for license terms.
 */
+#include <stdio.h>
+#include <string.h>
 #include <stdlib.h>
 #include <unistd.h>
 #include <sys/wait.h>
@@ -11,30 +13,91 @@
 #include <xcb/xcb_event.h>
 #include <xcb/randr.h>
 
+const xcb_query_extension_reply_t *r;
 xcb_connection_t *c;
 xcb_screen_t *s;
 
-char **cmdline;
+char *handler = 0;
 
 void handle_event( xcb_generic_event_t *e )
 {
-	const xcb_query_extension_reply_t *r;
-	r = xcb_get_extension_data(c,&xcb_randr_id);
 	if ( (e->response_type&0x7f) != (r->first_event+XCB_RANDR_NOTIFY) )
 		return;
-	/* fork and exec command */
+	xcb_randr_notify_data_t d = ((xcb_randr_notify_event_t*)e)->u;
+	char* hargs[8];
+	hargs[0] = handler;
+	char geom[64];
+	char oname[32];
+	int rot, len;
+	char *nm;
+	switch ( ((xcb_randr_notify_event_t*)e)->subCode )
+	{
+	case 0:
+		rot = d.cc.rotation&0xf;
+		hargs[1] = "cc";
+		hargs[2] = (rot==1)?"0":(rot==2)?"90":(rot==4)?"180":"270";
+		hargs[3] = (d.cc.rotation&0x10)?(d.cc.rotation&0x20)?"xy":"x"
+			:(d.cc.rotation&0x20)?"y":"none";
+		snprintf(geom,64,"%ux%u%+d%+d",d.cc.width,d.cc.height,d.cc.x,
+			d.cc.y);
+		hargs[4] = geom;
+		hargs[5] = 0;
+		printf("schange: crtc change\n rotation: %s\n"
+			" reflection: %s\n geometry: %s\n",hargs[2],hargs[3],
+			hargs[4]);
+		break;
+	case 1:
+		hargs[1] = "oc";
+		xcb_randr_get_output_info_cookie_t ck;
+		ck = xcb_randr_get_output_info_unchecked(c,d.oc.output,
+			d.oc.config_timestamp);
+		xcb_randr_get_output_info_reply_t *inf;
+		inf = xcb_randr_get_output_info_reply(c,ck,0);
+		if ( !inf ) hargs[2] = "UNKNOWN";
+		else
+		{
+			len = xcb_randr_get_output_info_name_length(inf);
+			nm = (char*)xcb_randr_get_output_info_name(inf);
+			strncpy(oname,nm,len);
+			oname[len] = 0;
+			hargs[2] = oname;
+		}
+		hargs[3] = (d.oc.connection==0)?"connected"
+			:(d.oc.connection==1)?"disconnected":"unknown";
+		hargs[4] = 0;
+		printf("schange: output change\n name: %s\n"
+			" connection: %s\n",hargs[2],hargs[3]);
+		break;
+	default:
+		/* ??? */
+		printf("schange: unhandled subcode %u\n",
+			((xcb_randr_notify_event_t*)e)->subCode);
+		hargs[1] = "unknown";
+		hargs[2] = 0;
+		break;
+	}
+	/* skip everything if there's no handler registered */
+	if ( !handler ) return;
 	int pid = fork();
-	if ( !pid ) execvp(cmdline[0],cmdline);
+	if ( !pid ) execvp(hargs[0],hargs);
 	else waitpid(pid,0,0);
 }
 
 int main( int argc, char **argv )
 {
-	if ( argc < 2 ) return 1;
-	cmdline = argv+1;
+	if ( argc > 1 ) handler = argv[1];
+	else printf("schange: warning, no handler assigned.\n");
 	c = xcb_connect(0,0);
+	r = xcb_get_extension_data(c,&xcb_randr_id);
+	if ( !r->present )
+	{
+		printf("schange: no RandR extension present\n");
+		xcb_disconnect(c);
+		return 1;
+	}
 	s = xcb_setup_roots_iterator(xcb_get_setup(c)).data;
-	xcb_randr_select_input(c,s->root,XCB_RANDR_NOTIFY_MASK_CRTC_CHANGE);
+	xcb_randr_select_input(c,s->root,XCB_RANDR_NOTIFY_MASK_CRTC_CHANGE
+		|XCB_RANDR_NOTIFY_MASK_OUTPUT_CHANGE);
 	xcb_flush(c);
 	xcb_generic_event_t *e;
 	while ( (e=xcb_wait_for_event(c)) )