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

diff --git a/autorandr b/autorandr
index e38fcad575b046efb8ca0b9f1d5643b3285aaa30..08725363e1627a52bb2f2f7bcbb7162644c754c9 100755 (executable)
--- 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() {