Resolution problem with Recalbox 8 on a 4K Samsung

[Tormentor667]

Dear developers and users, maybe someone can help me. I am having problems with the resolution of my Recalbox 8 (on a Pi4) attached to my Samsung 4K monitor.

Instead of being stretched to the max of the screen, I get black bars on the top and bottom of the screen and Recalbox is only displayed on some kind of a 21:9 resolution instead of using my 16:9 screen. It’s not cropped but instead the becels are stretched or drawn wider.

I would like to use the full screen for Recalbox though. What can I do?

Bonus question: Where can I deactivate Becels?

Thanks kindly,
Best regards
Dan

[Alvin]

@tormentor667
Maybe this will help:

https://wiki.recalbox.com/en/tutorials/video/display-configuration/complete-video-configuration-guide

To disable Overlays (Bezels) look here:
https://wiki.recalbox.com/en/basic-usage/features/overlays

[Tormentor667]

@alvin thanks kindly for your links, but unfortunately I don't get it to work. I've tried what has been suggested in the config guide and also found the right number for my 4K display but I don't get the right result.

I've found something out though:

As you can see, the tv screen itself has a picture ratio of 16:9, the displayed part from Recalbox has a video ratio from 21:9 though. Makes sense to display the "21:9" image in the middle of the "16:9" screen - yes, but from Recalbox, the tv should get a 16:9 signal but it gets a 21:9 one (tried to change that in my Samsung menue but it always states, that the signal is 21:9 and not 16:9).

How can I force the output from Recalbox to be 16:9?

Best regards,
Dan

EDIT
I got it fixed somehow. Changing the HDMI port on my tv made it work... maybe this helps someone else as well