From cb3ade51efa4131bf78f96c052e49b2a414b83e5 Mon Sep 17 00:00:00 2001
From: George Hotz <george@comma.ai>
Date: Tue, 20 Oct 2020 15:37:46 -0700
Subject: [PATCH] std::async has nodiscard in 20.04, i believe that function
 won't return until the async completes

---
 selfdrive/ui/qt/window.cc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/selfdrive/ui/qt/window.cc b/selfdrive/ui/qt/window.cc
index 37174ae74..e9dbd2189 100644
--- a/selfdrive/ui/qt/window.cc
+++ b/selfdrive/ui/qt/window.cc
@@ -107,7 +107,7 @@ void GLWindow::timerUpdate(){
   }
 #endif
 
-  std::async(std::launch::async,
+  auto f = std::async(std::launch::async,
              [brightness]{
                std::ofstream brightness_control("/sys/class/backlight/panel0-backlight/brightness");
                if (brightness_control.is_open()){