diff --git a/README.md b/README.md
index 10f16d0..1590df2 100644
--- a/README.md
+++ b/README.md
@@ -394,6 +394,7 @@ I am happy to discuss any comments and suggestions. Please feel free to contact
 
 | Version        | Date           | Comment  |
 | -------------- | -------------- | -------- |
+| 3.5.1          | 2016-09-14     | bugfix graphics info |
 | 3.5.0          | 2016-09-14     | added graphics info (controller, display) |
 | 3.4.4          | 2016-09-02     | tiny fixes system.model, getDefaultNetworkInterface |
 | 3.4.3          | 2016-09-02     | tiny bug fix fsStats, disksIO OSX |
diff --git a/lib/index.js b/lib/index.js
index 536fdfe..a05e9dc 100644
--- a/lib/index.js
+++ b/lib/index.js
@@ -81,6 +81,7 @@
 // --------------------------------
 //
 // version	date	comment
+// 3.5.1  2016-09-14  bugfix graphics info
 // 3.5.0  2016-09-14  added graphics info (controller, display)
 // 3.4.4  2016-09-02  tiny fixes system.model, getDefaultNetworkInterface
 // 3.4.3  2016-09-02  tiny bug fix fsStats, disksIO OSX
@@ -1149,7 +1150,10 @@ function graphics(callback) {
         }
         reject(error);
       }
-      let result = {};
+      let result = {
+        controllers: [],
+        displays: []
+      };
       if (_darwin) {
         let cmd = 'system_profiler SPDisplaysDataType';
         exec(cmd, function (error, stdout) {
@@ -1169,26 +1173,26 @@ function graphics(callback) {
           if (!error) {
             let lines = stdout.toString().split('\n');
             result.controllers = parseLinesLinuxControllers(lines);
-            let cmd = "xdpyinfo 2>/dev/null | grep 'depth of root window' | awk '{ print $5 }'";
+          }
+          let cmd = "xdpyinfo 2>/dev/null | grep 'depth of root window' | awk '{ print $5 }'";
+          exec(cmd, function (error, stdout) {
+            let depth = 0;
+            if (!error) {
+              let lines = stdout.toString().split('\n');
+              depth = parseInt(lines[0]) || 0;
+            }
+            let cmd = 'xrandr --verbose 2>/dev/null';
             exec(cmd, function (error, stdout) {
-              let depth = 0;
               if (!error) {
                 let lines = stdout.toString().split('\n');
-                depth = parseInt(lines[0]) || 0;
+                result.displays = parseLinesLinuxDisplays(lines, depth);
               }
-              let cmd = 'xrandr --verbose 2>/dev/null';
-              exec(cmd, function (error, stdout) {
-                if (!error) {
-                  let lines = stdout.toString().split('\n');
-                  result.displays = parseLinesLinuxDisplays(lines, depth);
-                }
-                if (callback) {
-                  callback(result)
-                }
-                resolve(result);
-              })
+              if (callback) {
+                callback(result)
+              }
+              resolve(result);
             })
-          }
+          })
         })
       }
     });