HDMI shuts down camera screen - how to fix it ?

Twisterfiddler

Rebel with a because
Jan 15, 2015
7
0
60
Switzerland
www.twisterfiddler.com
When I connect HDMI cable to my 6D or 80D, the camera's screen shuts down. Is there any way to fix this by specific menu settings ? I have searched but not found.

on my Sony A7s I can indeed leave the camera's screen on while HDMI is connected.