X.Org (and XFree86 > 4.3) won't run with SiS chips, I get 
Required symbol drmSiSAgpInit from module
/usr/X11R6/lib/modules/drivers/sis_drv.o is unresolved!

Fix: Move some #ifndef __FreeBSD__ in xc/programs/Xserver/hw/xfree86/os-support/bsd/drm/xf86drmCompat.c:



+++ xc/programs/Xserver/hw/xfree86/os-support/linux/drm/xf86drmCompat.c	Thu Jul 29 18:19:13 2004

@@ -77,8 +77,8 @@

 #include "mga_drm.h"

 #include "r128_drm.h"

 #include "radeon_drm.h"

-#ifndef __FreeBSD__

 #include "sis_drm.h"

+#ifndef __FreeBSD__

 #include "i810_drm.h"

 #include "i830_drm.h"

 #endif

@@ -1012,7 +1012,6 @@

    }

 }

 

-#ifndef __FreeBSD__

 /* SiS */

 

 Bool drmSiSAgpInit(int driSubFD, int offset, int size)

@@ -1026,6 +1025,8 @@

    return 1; /* TRUE */

 }

 

+#ifndef __FreeBSD__

+

 /* I830 */

 

 Bool drmI830CleanupDma(int driSubFD)


---
With this change, DRM and XV don't work, but X starts at least. glxgears shows only a black window.--PB1Y285m3R9h88A01uGdqQl3tzidFM7DAToMre3PHhLwhRpf
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--- /tmp/xc/programs/Xserver/hw/xfree86/os-support/linux/drm/xf86drmCompat.c	Thu Mar  4 18:48:10 2004
How-To-Repeat: Set Driver to "sis", start X.