Lxrandr not work

[Daniel Patón]

Hello list:

I have a minor question of the use of Lxrandr the screen configuration tool of LXDE. 

When I try to configure the screen only the LCD of my laptop is detected. 
However with xrandr I have this output:

---------------------------
% xrandr
Screen 0: minimum 320 x 200, current 1280 x 1024, maximum 3840 x 1920
VGA_1 connected 1280x1024+0+0 (normal left inverted right x axis y axis) 376mm x 301mm
   1280x1024      60.0*+   75.0     59.9  
   1152x864       75.0  
   1024x768       75.1     70.1     60.0  
   832x624        74.6  
   800x600        72.2     75.0     60.3  
   640x480        75.0     72.8     60.0  
   720x400        70.1  
PANEL connected 1280x1024+0+0 (normal left inverted right x axis y axis) 338mm x 211mm
   1280x800       60.0 +
   2560x1600Scaled   60.5  
   2048x1536      60.0  
   2048x1536Scaled   60.5  
   1920x1440      60.0  
   1856x1392      60.0  
   1792x1344      60.0  
   1920x1200Scaled   60.4  
   1920x1080Scaled   60.5  
   1600x1200      60.0  
   1600x1200Scaled   60.4  
   1680x1050Scaled   60.3  
   1400x1050      60.0  
   1400x1050Scaled   60.3  
   1440x960Scaled   60.4  
   1280x1024      60.0  
   1280x1024Scaled   60.5* 
   1280x960       60.0  
   1280x960Scaled   60.4  
   1280x854Scaled   60.4  
   1280x720Scaled   60.4  
   1152x768Scaled   60.3  
   1024x768       60.0  
   1024x768Scaled   60.4  
   800x600        60.3     56.2  
   800x600Scaled   60.3  
   768x576Scaled   60.4  
   854x480Scaled   59.8  
   720x480Scaled   59.8  
   640x480        59.9  
   640x480Scaled   60.1  
   320x240Scaled   57.6  
   320x200Scaled   55.7  
DVI-D_1 disconnected (normal left inverted right x axis y axis)
TV_7PIN_DIN disconnected (normal left inverted right x axis y axis)
---------------------------------

If I use this command:

xrandr --output PANEL --off

The LCD is disconnected. Why?

Regards,

-- 
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 Daniel Patón Domínguez
 Numerical Ecology. Ecology Unit
 Department of Plant Biology, Ecology and Earth Sciences
 Faculty of Sciences. University of Extremadura
 Avda. Elvas s/n 06071 Badajoz (Spain)
 http://unex.academia.edu/DanielPatonDominguez
 https://www.researchgate.net/profile/Daniel_Paton/
 http://sites.google.com/site/numericalecologyuex/home
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