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Intel HD4000 screen lit but black if external HDMI monitor plugged during boot


chriz74
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The machine is an Asus x301a with hd4000 graphics.

 

This is what happens if I plug the external monitor and boot:

 

https://youtu.be/t73txs_eHZo

 

The PC posts to external monitor, then after DSMOS arrives and framebuffers are initialized the internal screen lights up but no image is shown, image only in the external monitor

 

This is what happens if I plug the external HDMI after post at clover menu or even when the system is loaded.

 

https://youtu.be/mbCwRfDsDLI

 

internal already lit and image is shown after DSMOS and framebuffer initialization.

 

Setting primary display to IGFX in bios doesn't change behavior.

 

Any clue?

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