Same problem here
on Raspberry pi4
Everything was OK with Recalbox 7
Thanks if you have a solution

@alvin
not this week...

@Alvin
but there must be some parameters : version 7 worked... (and kodi, and different Linux pi distribution...)
I'm sorry to have updated...
And can't find version 7 back...

Woups I don't read enought the manual
If you're like me the answer is there :
https://wiki.recalbox.com/en/recalbox-8-0-faq#black-screen-issue
thanks Alvin, sorry for the time lost...
I go back to my final fantasy 7 game...

Woups I don't read enought the manual
If you're like me the answer is there :
https://wiki.recalbox.com/en/recalbox-8-0-faq#black-screen-issue
thanks Alvin, sorry for the time lost...
I go back to my final fantasy 7 game...

@Alvin
but there must be some parameters : version 7 worked... (and kodi, and different Linux pi distribution...)
I'm sorry to have updated...
And can't find version 7 back...

@alvin
not this week...

@Alvin
2. No change with another cable
3. no change
4. no change...

@alvin

1. seems a good hint
   Right HDMI port : no video
   Left HDMI port : no sound

So may be I need to get video out of Right port

I investigate but didn't find yet

Same problem here
on Raspberry pi4
Everything was OK with Recalbox 7
Thanks if you have a solution