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

-- 
[patch] agp for i830m broken in gutsy, works in feisty 
https://bugs.launchpad.net/bugs/139767
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