diff -rup linux-3.17.2.orig/drivers/gpu/drm/i915/i915_reg.h linux-3.17.2/drivers/gpu/drm/i915/i915_reg.h
--- linux-3.17.2.orig/drivers/gpu/drm/i915/i915_reg.h	2014-10-30 10:43:25.000000000 -0600
+++ linux-3.17.2/drivers/gpu/drm/i915/i915_reg.h	2014-11-05 16:35:52.855994498 -0700
@@ -2272,7 +2272,7 @@ enum punit_power_well {
 #define GEN7_CXT_SIZE		0x21a8
 #define GEN7_CXT_POWER_SIZE(ctx_reg)	((ctx_reg >> 25) & 0x7f)
 #define GEN7_CXT_RING_SIZE(ctx_reg)	((ctx_reg >> 22) & 0x7)
-#define GEN7_CXT_RENDER_SIZE(ctx_reg)	((ctx_reg >> 16) & 0x3f)
+#define GEN7_CXT_RENDER_SIZE(ctx_reg)	((ctx_reg >> 14) & 0xff)
 #define GEN7_CXT_EXTENDED_SIZE(ctx_reg)	((ctx_reg >> 9) & 0x7f)
 #define GEN7_CXT_GT1_SIZE(ctx_reg)	((ctx_reg >> 6) & 0x7)
 #define GEN7_CXT_VFSTATE_SIZE(ctx_reg)	((ctx_reg >> 0) & 0x3f)