The diff below might fix the corruption and/or artifacts that people
have reported seeing with the new Mesa in -current on older Intel
hardware. And older Intel hardware here means more or less everything
before Sandy Bridge.
Index: agp_i810.c
===================================================================
RCS file: /cvs/src/sys/dev/pci/agp_i810.c,v
retrieving revision 1.78
diff -u -p -r1.78 agp_i810.c
--- agp_i810.c 6 Jun 2013 16:14:26 -0000 1.78
+++ agp_i810.c 14 Nov 2013 15:49:11 -0000
@@ -754,6 +754,8 @@ agp_i810_bind_page(void *sc, bus_addr_t
physical |= GEN6_PTE_CACHE_LLC;
break;
default:
+ if (flags & BUS_DMA_GTT_NOCACHE)
+ physical |= INTEL_COHERENT;
if (flags & BUS_DMA_COHERENT)
physical |= INTEL_COHERENT;
break;
