@mitu Hmm, that booted up with a Super CPU bootscreen, but then just did the same as running in lr-vice (testing it with Metal Dust, which goes through the intro then gets to an options screen then just dumps you back to the C64 OS when you hit Return to start the game, whichever options you choose).
You saved me perhaps a weeks time. I would have been playing around with this, reinstalling the RetroPie image, starting from scratch, trying this that and everything. Then maybe if I was lucky I would have come up with the answer.
Thank you for saving my time and giving me the answer!
I wonder why some games are for Joystick 1 and some for Joystick 2.
I found a lot of help in this forum. I'm very happy when I can help someone else ;)
Sorry the quality is so bad. Hopefully you can see the signal blanking out as I switch between the menu and the running system. The monitor's HDMI2 input notification appears in the top-right each time this happens.
The output resolution is 1080p@60 in both the system and the menu (I tried to show this but it's hard to see the monitor's OSD).
It feels more like the SDL window(?) is being recreated as I switch between the system and the menu.
With the FKMS driver, the monitor never blanks out and switching between the running system and the menu is instant.