Screen goes black after orientation changing

[eyalfish23]

I have a problem.

I got an LCD 8' screen,It supports 800x1280 resolution. And i am with Imx6 som with debian 9.5(stretch) OS. 

I did manage to bring the screen up, adding the correct resolution and parameters to fb_videomode_edid .

My problem is, I want to flip the screen to landscape mode.

I try using xrandr -o left/right but screen goes black. 

I try to add the opposite resolution 1280x800 but without success.

What can i do next?

xrandr --verbose ,shows:

DISP3 BG connected primary 800x1280+0+0 normal(normal left invert right) ...

Thank you

[Bio_TICFSL]

Hello,

Sorry we won't work with debian and x11 is not supported in current BSP, but I guess is the resolution.

Regards