I tried 2.6.26.3-17 fedora build and found no patch for http://bugs.freedesktop.org/show_bug.cgi?id=14507. I tried git version 2.6.26.3 and it fixed!
The bug must be in our modesetting patches then.
i tried booth kernel-2.6.27.4-19.fc9 fedora build and 2.6.27.4 git version. Same issue, fedora build do not have fix, and git version works fine. I use same .config for booth kernels (make xconfig/load "/boog/config-...19") Look like here some bad patch in fedora build
Works fine under Fedora 10