I'm using XFree 3.3.3.1 on a SparcServer 4. It has the onboard TCX and a single-slot GX card, both of which are 8-bit color framebuffers. Xsun will start on both heads and even let me send clients to display :0.1, but as soon as I send something to :0.0 it dumps core. I'm using kernel 2.0.35-15 (built from the rpms on your ftp site). Things work fine when I use either head as a separate X display. This problem only evidences itself when I try to start up Xsun in a dual-headed configuration.
Jeff, do you know of any patches to fix this issue?
We'll try to fix this in XFree86-4.0.
*** This bug has been marked as a duplicate of 2446 ***