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Ctrl-DimF1 (which has a "dimming" circle with short marks around it) or Ctrl-BrightF2work(which has a "bright" circle with longer marks around it)work on the external display. Dim and Bright, alone, work on the native display.
Ctrl-Dim or Ctrl-Brightwork on the external display. Dim and Bright, alone, work on the native display.
Ctrl-F1 (which has a "dimming" circle with short marks around it) or Ctrl-F2(which has a "bright" circle with longer marks around it)work on the external display. Dim and Bright, alone, work on the native display.