[Xorg] Pixmap 24/32 on dual videocard system

[Nils Breunese]

I run X.org 6.7.0-5 with two videocards (AGP nvidia and an old PCI SiS) 
in my system. I used to run XFree86 on my system and those two 
videocards worked fine. Then I switched to X.org, but ever since I don't 
seem to be able to get both cards working simultaneously in X.

I have this in my /etc/X11/xorg.conf:

Section "ServerFlags"
         Option  "Pixmap" "32"
EndSection

When the Pixmap option is set to 32 and I start X only the monitor 
attached to my nvidia card comes up. In /var/log/Xorg.0.log I find the 
following error:

(EE) SIS(1): Driver can't support depth 24 pixmap format (32)
(EE) SIS(1): **************************************************
(EE) SIS(1):                       ERROR:
(EE) SIS(1): xf86SetDepthBpp() error
(EE) SIS(1):                   END OF MESSAGE
(EE) SIS(1): **************************************************

However, when I change the Pixmap option to 24 only the monitor 
connected to my SiS card works and /var/log/Xorg.0.log reads:

(EE) NVIDIA(0): Driver can't support depth 24 pixmap format (24)

(Doesn't matter if I use the X.org nv driver or nvidia's binary release).

My question is: is there a way to get both working under X.org? Can I 
specify different pixmap values for each card? If so, how? Any other 
suggestions?

Thanks,

Nils.
-- 
"I got a funny feeling they got plastic in the afterlife" - Beck
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