monitor_reconfig: Disable LCD when using external monitor.

resolution_selector.cc

 // Copyright (c) 2010 The Chromium OS Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "monitor_reconfig/resolution_selector.h"
 
 #include "base/logging.h"
 
 namespace monitor_reconfig {
 
@@ skipping 28 matching lines @@
     return FindNearestResolutions(
         lcd_modes, external_modes,
         lcd_resolution, external_resolution, screen_resolution);
   } else {
     // If the external output is large enough that we think it's a monitor
     // (as opposed to a projector), then we just use its max resolution and
     // forget about trying to choose a screen size that'll fit on the
     // built-in display.
     if (max_external_size > kMaxProjectorPixels) {
       *external_resolution = *screen_resolution = external_modes[0].name;
-      *lcd_resolution = lcd_modes[0].name;
+      lcd_resolution->clear();
       return true;
     }
     return FindNearestResolutions(
         external_modes, lcd_modes,
         external_resolution, lcd_resolution, screen_resolution);
   }
 }
 
 bool ResolutionSelector::FindNearestResolutions(
     const vector<Mode>& larger_device_modes,
@@ skipping 22 matching lines @@
     }
   }
 
   LOG(WARNING) << "Failed to find a resolution from larger device "
                << "exceeding chosen resolution from smaller device ("
                << *smaller_resolution << ")";
   return false;
 }
 
 }  // namespace monitor_reconfig