Not sure, if m1n1 is the right place to report this ...

I installed Asahi Linux with the installer on a Mac Mini M1 on the internal SSD. Basically works fine with the known limitations.

However, if my external USB disk is connected (which I use for time machine backups when macOS is running), the boot process fails (see photo)

Any ideas? I would prefer to leave the usb disk connected, as it is useful when running macOS.