Comment 3 for bug 139767

I was asked to attach the patch to this ticket. Here we go:

diff --git a/drivers/char/agp/agp.h b/drivers/char/agp/agp.h
index 35ab1a9..8955e7f 100644
--- a/drivers/char/agp/agp.h
+++ b/drivers/char/agp/agp.h
@@ -176,7 +176,7 @@ struct agp_bridge_data {
 #define I830_GMCH_MEM_MASK 0x1
 #define I830_GMCH_MEM_64M 0x1
 #define I830_GMCH_MEM_128M 0
-#define I830_GMCH_GMS_MASK 0xF0
+#define I830_GMCH_GMS_MASK 0x70
 #define I830_GMCH_GMS_DISABLED 0x00
 #define I830_GMCH_GMS_LOCAL 0x10
 #define I830_GMCH_GMS_STOLEN_512 0x20
@@ -190,6 +190,7 @@ struct agp_bridge_data {
 #define INTEL_I830_ERRSTS 0x92

 /* Intel 855GM/852GM registers */
+#define I855_GMCH_GMS_MASK 0xF0
 #define I855_GMCH_GMS_STOLEN_0M 0x0
 #define I855_GMCH_GMS_STOLEN_1M (0x1 << 4)
 #define I855_GMCH_GMS_STOLEN_4M (0x2 << 4)
diff --git a/drivers/char/agp/intel-agp.c b/drivers/char/agp/intel-agp.c
index 2c9ca2c..c15f5d2 100644
--- a/drivers/char/agp/intel-agp.c
+++ b/drivers/char/agp/intel-agp.c
@@ -506,7 +506,7 @@ static void intel_i830_init_gtt_entries(void)
    break;
   }
  } else {
- switch (gmch_ctrl & I830_GMCH_GMS_MASK) {
+ switch (gmch_ctrl & I855_GMCH_GMS_MASK) {
   case I855_GMCH_GMS_STOLEN_1M:
    gtt_entries = MB(1) - KB(size);
    break;
--
1.5.2.5

Download URL: http://lkml.org/lkml/diff/2007/9/12/138/1

You can also pull this patch from kernel.org git, it was introduced before 2.6.23rc7 in e67aa27a6179c287983c6c525beb5320f5cd1672 - see http://www.kernel.org/pub/linux/kernel/v2.6/testing/ChangeLog-2.6.23-rc7