So I upgraded the software also (with emplode) which also have worked.

Remember that the software upgrade overwrites the kernel with the factory kernel. So if you want the hijack kernel, you need to re-install it.

I will try to get display server to see the remaining half of the display

If you have the hijack kernel installed, just use CharcoalGray99's XML interface, or write your own routine to retrieve http://your.empeg.ip.address/proc/empeg_screen.png. Displayserver has kind of been replaced by that feature hijack.