Two Nvidia cards, and black screen

[<han...@sa...>]

Hi!

I have 1 NVIDIA Gefore FX 5200 PCI, and one NVIDIA Gefore 6600 PCI-E 
card. I have both X servers set up correctly so that they run without 
any problem seperatly (with different keyboards and mice). Both X 
servers use the nvidia close source 6629 driver.

My problem is that whenever I try to start the second X server, while 
the first one is already running, the monitor connected to the first X 
server goes black (monitor is turned off/signal lost). The xserver 
itself however continues running, and all applications (like music from 
xmms) also continue running. There are no errors in any log files. There 
is no difference when trying to start the X servers in the opposite 
order. Starting the second X server always kills the display of the one 
already running.

I have tried to turn the monitor back on with "xset dpms dorce on 
-display :0.0", but this doesn't help.

I'm running x.org 6.8.2 with the IsloateDevice patch. I'm actually not 
running ruby anymore, but I'm using the evdev driver for the separate 
keyboards/mice (https://bugs.freedesktop.org/show_bug.cgi?id=968), so in 
a sence I'm posting to the "wrong" list, but I guess people here are the 
most experienced with these kind of setups.

The PCI card is also set as the primary graphics card in bios, otherwise 
it didn't work at all.

Thanks for any help on this!

-Hans