Has anyone gotten the second HDMI output to work in the 64-bit version of Arch Linux ARM?
It works fine for me with the 32-bit distro, but when I boot the 64-bit one both monitors are set to slightly different rainbow colours, and after that point only the first screen is used. I can load Xorg and applications on the first screen, but the second one just continues to display the rainbow colours from the boot process.
I had to install the xf86-video-fbdev module before Xorg would load, but I'm not sure if this is correct. It's supposed to use hardware accelerated VC4 graphics, but I can't find anyone who has documented how they got Xorg going on the Pi4 + aarch64.
Is the second HDMI output not supported on the 64-bit distro? It said on the Arch Linux ARM install page that the 64-bit distro supports all the hardware so I'm guessing it must just be some sort of configuration option I missed. Any pointers?