Hello.
I was wondering, is there is an advantage to using UAE on a Linux system using frame buffer instead of X11? (X-Amiga)
X11 isn't well suited as a backend for emulators. Tearing, delays, high cpu usage on copy operations...
I wrote a KMS backend for SDL 1.2.x months ago and got decent results without X11 (smooth scrolls on NTSC freqs, no tearing by the means of a double-buffered display), but I'd use FS-UAE for now with it's OpenGL backend.
The future is SDL 2.0 wich has nice GL_ES support, no X11 scumm needed.
Back to the topic, the linux framebuffer device / driver (/dev/fbX) is deprecated. The KMS framebuffer is the way to go nowadays. And yes, it's way better than using crufty bloated X11 backend any day of the week.