Solved ! :)
After multiples tests, the problem was the raspberry has CPU overload when hdmi plugged.
I’ve deduce this with this test : disable the remotecontrol module, that need a lot of CPU to works, and it was better.
So, I’ve tried to modify some parameters on /boot/config.txt, and the good one was to define manually the hdmi_group and hdmi_mode
My display is old vga screen 1680x1050 60Hz
So, according to the documentation, the good parameters is
hdmi_group=2
hdmi_mode=58
But, result was the same. So I’ve tested with reduced blanking mode
hdmi_group=2
hdmi_mode=57
And now all works great :)
Have a nice day.