Hi Calamity,
thanks for your help. When you say "add this to your kernel boot line", I'm assuming,
pressing TAB in boot menu and adding to options "drm.edid_firmware=DP-1:edid/generic_15.bin"
and replacing text after video= with "DP-1:e", like in the picture.
Now gasetup can see both television and arcade monitor.
If I leave the tv connected, it loads attractmode on the tv. Selecting a game, tv goes black and pc sends signal to arcade monitor with clear picture.
If I disconnect the tv, I get garbage on the arcade monitor in attractmode, and clear picture when selecting a game like before.
Hi abispac,
if I set jumper to 15kHz only on J-Pac, I get a darker and not steady picture in gasetup menus.
Hi Mike A,
I am not sure if the power supply is the original. It came connected like that, as shown in the last picture.