Tanix TX3 Max (s905w) Problem with hdmi to vga adapter

Hi, I have some problems with a tanix TX3 max (s905w) and a hdmi to vga adapter. Emuelec works great connected to the hdmi (I first had to start it from a usb then I was able to start it also from the sd card). However if I use an hdmi to vga adapter I have no signal on monitor. The same adapter works on the device when it starts with android.