Created attachment 138014 [details]
Log and Configuration data

This system had a 760G [Radeon 3000] and a Radeon X1550 video cards and had
worked satisfactorily for a number of years. The Radeon X1550 recently started
to show signs of age so I decided to replace it with a RV710 [Radeon HD 4350] I
have available. The only change I made was to update the kernel with firmware
blobs for the RV710 [Radeon HD 4350]. The xserver now crashes on startup and
reports:

destination is framebuffer incomplete: incomplete/missing attachment [8cd7]

The user space system is a 32bit LFS/BLFS build (kept mostly up to date) and
the kernel is 64bit currently version 4.14.25.

I am attaching some relevant configuration and log files for information. 

Is this a configuration issue on my part or a real software problem ?