diff --git a/test-case/multiple-pipeline.sh b/test-case/multiple-pipeline.sh
index c57d2c38..1b4ccb98 100755
--- a/test-case/multiple-pipeline.sh
+++ b/test-case/multiple-pipeline.sh
@@ -207,7 +207,8 @@ do
     sleep 1 # try not to pollute the next iteration
 
     if pgrep arecord || pgrep aplay; then
-        printf '%c' 't' | sudo tee /proc/sysrq-trigger > /dev/null
+        printf 'd' | sudo tee /proc/sysrq-trigger > /dev/null
+        printf 'w' | sudo tee /proc/sysrq-trigger > /dev/null
         sleep 1
     fi