From 83355f418b766be94a49c51a4f2cf77362148b0e Mon Sep 17 00:00:00 2001
From: tachylatus <helgesdk@gmail.com>
Date: Thu, 4 Jul 2013 12:44:43 +0200
Subject: [PATCH] Workaround xrandr bug: "cannot find crtc for output" -
 efficient solution

xrandr will typically fail when switching outputs, if the maximum number is already enabled.
This patch will cause xrandr to be called twice:
- First invocation will only disable outputs, freeing up CRTCs
- Second invocation will only enable outputs
---
 autorandr | 23 ++++++++++++++++++++++-
 1 file changed, 22 insertions(+), 1 deletion(-)

diff --git a/autorandr b/autorandr
index e38fcad..0872536 100755
--- a/autorandr
+++ b/autorandr
@@ -174,7 +174,28 @@ config_equal() {
 }
 
 load_cfg_xrandr() {
-	sed 's!^!--!' "$1" | xargs $XRANDR
+	# sed 1: Prefix arguments with "--"
+	# sed 2: Merge arguments into one line per output
+	# sed 3: Merge into two lines, all --off outputs in the first one
+	sed 's/^/--/' "$1" | sed -e '
+		:START
+		/\n--output/{P;D}
+		s/\n/ /
+		N;bSTART' | sed -e '
+			### First line
+			/ --off/{
+				G
+				# Merge if next line contains --off
+				s/\n\([^\n]* --off\)/ \1/
+				h
+				$!d;b
+			}
+			### Last line
+			H;x
+			# Merge if previous line contains --mode
+			s/\(--mode [^\n]*\)\n/\1 /
+			h
+			$!d' | xargs -L 1 $XRANDR
 }
 
 load_cfg_disper() {
-- 
2.39.2