Groovyarcade 31khz with VGA CRT + Rotated configuration

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Hello,

I'm running Groovyarcade with 31khz, under Xorg and CRT VGA monitor, everything works fine on horizontal even deformed vertical games, but when rotating most games don't sync and give a black screen.

My rig is a mini pc with Ryzen 7 and Ati Vega RX 10 with an hdmi>vga adapter (ugreen).

Maybe i'm missing something that messes with vertical resolutions ?

Cheers

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Update :

I figured out some vertical games and some don't, for example all the cave/raizing work, but not the capcom/konami, it looks like some resolutions are not supported out of the box during the hdmi/vga conversion.

I already had a similar issue on Windows and needed to use EDID emulation to get over that, how is it possible to achieve that on Groovyarcade ?

Could be something totally different but i'm looking for workarounds

Also, is it possible to hack the bios to force 480p during boot / splash screen and setup sequences ?

It seems that the resolution is too high for 480p arcade monitors

Cheers

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it turned out theproblem was with min dotclock not being set to 25.0