impossible to display information on a ML with my external LCD via HDMI MARK III

[pwhy34]

ML I installed on my Mark III, I have all information on the screen Mark III, it's great.
When I connect my LCD 5 "Marshall via the HDMI port on the Mark III, I have no more information. I looked in all the documentation and I have not found anything about it. This is it normal or there is a specific setting to see information on the LCD? thank you in advance for your help
Pwhy