$ xrandr  
Screen 0: minimum 320 x 200, current 1366 x 768, maximum 8192 x 8192  
LVDS-1 connected 1366x768+0+0 (normal left inverted right x axis y axis) 309mm x 174mm  
 1366x768 60.0*+  
 1024x768 59.9   
 800x600 59.9   
 640x480 59.4   
 720x400 59.6   
 640x400 60.0   
 640x350 59.8   
VGA-1 disconnected (normal left inverted right x axis y axis)  
HDMI-1 disconnected (normal left inverted right x axis y axis)  
#查看輸出裝置 我的輸出是LVDS-1  
$ xrandr --output LVDS-1 --rotate right #這裡可以是 right left inverted normal  
$ xrandr --output LVDS-1 --rotate normal #這樣子改回來