I have now successfully compiled and tested the unichrome driver. There was no support for the Panel LCD on this driver either. Even compiling with --enable-experimental flag set gave me nothing more than the Openchrome driver.
Note that the project seems to have been abandoned - nothing new has been added since 2007 and the LinuxQuestions list for the project has plenty of subscribers, every one of them spam generators.
So that was not worth the effort.
Reverting back to Openchrome:
I have now done a line by line comparison between the xorg logs between the 'via' driver in Fedora 6 and the Openchrome driver in Fedora 10. It seems that there are differences but these are most likely to be due to the changes in xorg. The messages from the Via and Opennchrome drivers are very similar. Both show similar "Panel on K8M800 or PM800 is currently not supported., Using VBE to set modes to work around this." messages.
I have tried numerous varients of the xorg.conf file with the best performance comming after switching off acceleration with:
Option "NoAccel" "True"
I am now of the opinion that the Openchrome should work but simply does not, perhaps this is a problem between my hardware and the driver.
I have seen a similar problem on the Openchrome website, so I will continue reporting the results at:
Thanks for listening folks.