Trouble upgrading OpenMSX on Raspberry Pi 400

First of all, I am really curious to know what you changed in the source code and why. I would expect these things could be achieved with settings instead and if not I would like to know

There is also a setting for the menu button. In the console type: about menu. Might reveal it.

osd_menu_button is the setting you need.

These combos do not need any source code changes. You should be able to unbind them.

Starting in full screen should be a matter of setting the setting and saving settings.

Check the renderer setting, I would say, but I remember that it only reflects the setting value, not the actual renderer used (if OpenGL isn't working it falls back to software rendering). You could try SDLGL-PP specific settings, like a scale factor of 4.

@Zwarteziel: How does the pi fill the screen? Does it look good? Thanks for sharing. As soon as I receive the pi I will look into things and see if I can push the mxs to absolute limits. Perhaps stripping the linux to the absolute bare minimum will help. I have no desktop whatsoever running on the testimage just the bare x server. All these little things may help. We will see.

@Manuel: Ok will try to find out if the opengl is being used. I remember that the Pi has some very specific code requirements for the opengl to work hence the reason I will use the official raspian kernel w. modules and firmware and boot ubuntu from there. glxinfo will at least give me a hint about the availability of opengl.

yes the kernel is compiled with kms so it should be working. There is indeed a possibility to drop x completely and allow openmsx to output directly to the framebuffer. Never done something like that though.