HDMI RetrOrangePi working but not Retroarch

[blazouf]

Hello.
I just received my Zeuslap portable screen. I have a problem with the HDMI output.
I applied the latest V3 update.
The HDMI script works, and i can boot to EmulationStation. 
But when I launch RetroArch, the external screen goes black but I can hear the sound of the game.
My screen went well in 720p 60hz.
Should I force the HDMI output in retroarch.cfg ? ( Video_monitor_index = '1' )
But in this case, the internal screen will no longer work when the Retroarch is in nomadic mode without an external HDMI screen.
How to do ?

EDIT : It works with others core like SuperNintendo or PCEngine, but not with Mame or FBA. So i have to investigate more..

SOLUTION: Ok, in fact, for some reasons, the FBA and MAME core had a resolution of 640 x 480. 
I think my screen can't output to this resolution. So i change it to 1280 x 720 and.. voila ! It works !

Sorry for the wrong alert..

[alexkidd]

OK, anyway, our script is set to switch back to LCD and shutdown when no HDMI is detected, so next time you power on it will land on LCD again

[blazouf]

OK.
One more question :
is it possible to update to the last version of RetroArch (1.8.6), or is it more safe to wait for futurs update of RetrOranPie ?

[alexkidd]

some Retroarch dependencies (basically EGL and GLES libraries) are blocked to avoid compatibility issues, so updating would not work .
It's safer to wait upcoming release, Retroarch 1.8.6 is already working on our tests.

[blazouf]

That's great news !

[blazouf]

In fact it's not solve..
I've change the resolution to 1280 x 720 for FBA and mame, but now i can't use the Retrostone in handeled mode for theses core.
Retroarch lauch and quit.. Same probleme as before, but reverse..

[alexkidd]

change it back to 640x480 manually until we find a better solution

[blazouf]

Okay..
But I do not understand how do the others to alternate between the two uses ?
My portable screen is brand new with USB-C and HDMI : 
https://www.aliexpress.com/snapshot/0.ht...2294424414

What settings should I put?

Here is my configuration:

All / retroarch.cfg
custom_viewport_height = "720"
custom_viewport_width = "1280"
video_fullscreen_x = "1280"
video_fullscreen_y = "720"
video_windowed_position_height = "1280"
video_windowed_position_width = "720"


Arcade / retroarch.cfg
custom_viewport_height = "480"
custom_viewport_width = "640"
video_fullscreen_x = "1280"
video_fullscreen_y = "720"
video_windowed_position_height = "640"
video_windowed_position_width = "480"

fba / retroarch.cfg
custom_viewport_height = "480"
custom_viewport_width = "640"
video_windowed_position_height = "640"
video_windowed_position_width = "480"
video_windowed_position_height = "640"
video_windowed_position_width = "480"

[alexkidd]

all widths and heights seem inverted, try fixing them
i'll have to fix the image btw :|

[blazouf]

It's normal, it's because i play in Tate mode for the Shmups (FBA and Arcade).
I've put a rotation parameter :

video_rotation = "1"
video_allow_rotate = "true"