[Openchrome-users] X won't start, K8M800, slackware 12

[kuzh anan]

Hello list, 
I installed the driver according the instructions on http://wiki.openchrome.org/tikiwiki/tiki-index.php?page=Compiling+the+source+code 
then I changed xorg.conf: 
Identifier  "Card0"
        Driver      "via"
        Option      "EnableAGPDMA" "On"
        Option      "ForcePanel"
        VendorName  "Unknown Vendor"
        BoardName   "Unknown Board"
        BusID       "PCI:1:0:0"
(I also tried without the Options "EnableAGPDMA" "On", "ForcePanel", and with Driver "openchrome")
But when I restart the x server there is only a black screen and nothing happens. Xorg.0.log says: 

X Window System Version 1.3.0
Release Date: 19 April 2007
X Protocol Version 11, Revision 0, Release 1.3
Build Operating System: Slackware 12.0 Slackware Linux Project
....
....
(II) LoadModule: "via"
(II) Loading /usr/lib/xorg/modules/drivers//via_drv.so
(II) Module via: vendor="X.Org Foundation"
        compiled for 1.3.0, module version = 0.2.1
        Module class: X.Org Video Driver
        ABI class: X.Org Video Driver, version 1.2
....
....
(II) VIA: driver for VIA chipsets: CLE266, KM400/KN400, K8M800,
        PM800/PM880/CN400, VM800/CN700/P4M800Pro
(II) Primary Device is: PCI 01:00:0
(EE) No devices detected.

Fatal server error:
no screens found

The vesa driver 'works', except the flickering and the inability to watch films. 
Any ideas? Thanks in advance 
Best regards 
Martin