https://bugs.freedesktop.org/show_bug.cgi?id=29217
--- Comment #7 from boris64 bugs.xorg@boris64.net 2010-07-22 08:55:48 PDT --- No / No.
It even doesn't seem to work after a warm reboot. I only get a test picture (as if there was no connection between monitor and graphic card) when the bios boots up.
I had to hard reset the computer to get a working second monitor again.