Alex Deucher wrote in with this announcement / request:
This is to announce the availability of a mergedfb option for theradeon driver. In mergedfb mode, there is a single framebuffer with 2linked viewports looking into it. This should enable HW-acceleratedOpenGL on both heads among other things. The code is largedly based onthe mergedfb work for the sis driver done by Thomas Winishhofer.The options for the radeon driver arethe same as those for the sis and mga mergedfb modes. Also thanks toJens Owens and Jonathan Thambidurai for planting the idea in my headthat this was possible with the radeon driver, and to all those whoadded Clone mode support to the radeon driver which made addingmergedfb support much easier.
Get the lastest diff’s and 4.3.0 binaries here:http://www.botchco.com/alex/radeon/mergedfb/final/
All the .c/.h files are available here:http://www.botchco.com/alex/radeon/mergedfb/