The apm driver in the SVGA server is for Alliance Promotion
graphics chipsets. The following chipsets are supported:
6422
Old chipset. The driver is still very unstable, including computer
crashes. You would prefer using XFree86 3.3.x for this chipset.
AT24
As found in Diamond Stealth Video 2500. Quite similar to AT3D.
AT25, AT3D
AT3D is found in Hercules Stingray 128/3D. Most other Voodoo
Rush based cards use the AT25 which is identical except it
doesn't have the 3D stuff in it.