UDOO need TV monitor to display on an other monitor

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I've got a UDOO Ultra card on my robot and also a Koolertron Monitor (https://www.amazon.fr/dp/B0714DQPJW/ref=cm_sw_r_cp_api_i_0pcfCbCYSXAXR).



The problem is that the Ubuntu 16.04 installed on the card don't output anything on the display (tested on HDMI and Display Port). If we plug the UDOO to a TV Screen, the display appears, and if we unplug the TV Screen to the Koolertron Monitor, it also works ...



Do you have an idea why the card need other monitor to start output display ?



Thank you for your help !










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    0















    I've got a UDOO Ultra card on my robot and also a Koolertron Monitor (https://www.amazon.fr/dp/B0714DQPJW/ref=cm_sw_r_cp_api_i_0pcfCbCYSXAXR).



    The problem is that the Ubuntu 16.04 installed on the card don't output anything on the display (tested on HDMI and Display Port). If we plug the UDOO to a TV Screen, the display appears, and if we unplug the TV Screen to the Koolertron Monitor, it also works ...



    Do you have an idea why the card need other monitor to start output display ?



    Thank you for your help !










    share|improve this question

























      0












      0








      0








      I've got a UDOO Ultra card on my robot and also a Koolertron Monitor (https://www.amazon.fr/dp/B0714DQPJW/ref=cm_sw_r_cp_api_i_0pcfCbCYSXAXR).



      The problem is that the Ubuntu 16.04 installed on the card don't output anything on the display (tested on HDMI and Display Port). If we plug the UDOO to a TV Screen, the display appears, and if we unplug the TV Screen to the Koolertron Monitor, it also works ...



      Do you have an idea why the card need other monitor to start output display ?



      Thank you for your help !










      share|improve this question














      I've got a UDOO Ultra card on my robot and also a Koolertron Monitor (https://www.amazon.fr/dp/B0714DQPJW/ref=cm_sw_r_cp_api_i_0pcfCbCYSXAXR).



      The problem is that the Ubuntu 16.04 installed on the card don't output anything on the display (tested on HDMI and Display Port). If we plug the UDOO to a TV Screen, the display appears, and if we unplug the TV Screen to the Koolertron Monitor, it also works ...



      Do you have an idea why the card need other monitor to start output display ?



      Thank you for your help !







      linux display hdmi






      share|improve this question













      share|improve this question











      share|improve this question




      share|improve this question










      asked Dec 18 '18 at 10:13









      user975067user975067

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