Correct logic around enabling display-only device configuration

benchmark/configure.py

@@ -22,6 +22,7 @@ def setUseRequestedDevice(context,
     # preferably non-display one.
     if requested_device == "":
         device_found = False
+        display_device = None
         # Try to enable first non-display card.
         for device in cpref.devices:
             if device.type != device_type:
@@ -29,6 +30,7 @@ def setUseRequestedDevice(context,
                 continue
             if isDisplayDevice(device):
                 device.use = False
+                display_device = device
             elif not device_found or not device_single:
                 # Enable first non-display GPU.
                 device_found = True
@@ -38,7 +40,7 @@ def setUseRequestedDevice(context,
                 device.use = False
         if not device_found:
             # Only display devices, enable first of them.
-            cpref.devices[0].use = True
+            display_device.use = True
             device_found = True
     else:
         device_found = False