diff --git a/kernel.spec b/kernel.spec
index 3beeafd73..92bfc3d93 100644
--- a/kernel.spec
+++ b/kernel.spec
@@ -657,6 +657,8 @@ Patch1819: drm-intel-big-hammer.patch
 Patch1825: drm-intel-make-lvds-work.patch
 Patch1900: linux-2.6-intel-iommu-igfx.patch
 
+Patch1920: radeon-mc-vram-map-needs-to-be-gt-pci-aperture.patch
+
 # linux1394 git patches
 Patch2200: linux-2.6-firewire-git-update.patch
 Patch2201: linux-2.6-firewire-git-pending.patch
@@ -1288,6 +1290,8 @@ ApplyOptionalPatch drm-nouveau-updates.patch
 #ApplyPatch drm-intel-make-lvds-work.patch
 ApplyPatch linux-2.6-intel-iommu-igfx.patch
 
+ApplyPatch radeon-mc-vram-map-needs-to-be-gt-pci-aperture.patch
+
 # linux1394 git patches
 #ApplyPatch linux-2.6-firewire-git-update.patch
 #ApplyOptionalPatch linux-2.6-firewire-git-pending.patch
@@ -1988,6 +1992,9 @@ fi
 #                 ||     ||
 
 %changelog
+* Wed Nov 24 2010 Kyle McMartin <kyle@redhat.com>
+- drm/radeon/kms: MC vram map needs to be >= pci aperture size (fdo#28402)
+
 * Wed Nov 24 2010 Kyle McMartin <kyle@redhat.com>
 - Fix graphics on HP 2530p (korg#23542)
 
diff --git a/radeon-mc-vram-map-needs-to-be-gt-pci-aperture.patch b/radeon-mc-vram-map-needs-to-be-gt-pci-aperture.patch
new file mode 100644
index 000000000..88fa35e2f
--- /dev/null
+++ b/radeon-mc-vram-map-needs-to-be-gt-pci-aperture.patch
@@ -0,0 +1,32 @@
+commit b7d8cce5b558e0c0aa6898c9865356481598b46d
+Author: Alex Deucher <alexdeucher@gmail.com>
+Date:   Mon Oct 25 19:44:00 2010 -0400
+
+    drm/radeon/kms: MC vram map needs to be >= pci aperture size
+    
+    The vram map in the radeon memory controller needs to be
+    >= the pci aperture size.  Fixes:
+    https://bugs.freedesktop.org/show_bug.cgi?id=28402
+    
+    The problematic cards in the above bug have 64 MB of vram,
+    but the pci aperture is 128 MB and the MC vram map was only
+    64 MB.  This can lead to hangs.
+    
+    Signed-off-by: Alex Deucher <alexdeucher@gmail.com>
+    Cc: stable@kernel.org
+    Signed-off-by: Dave Airlie <airlied@redhat.com>
+
+diff --git a/drivers/gpu/drm/radeon/r100.c b/drivers/gpu/drm/radeon/r100.c
+index 6112ac9..6d1540c 100644
+--- a/drivers/gpu/drm/radeon/r100.c
++++ b/drivers/gpu/drm/radeon/r100.c
+@@ -2270,6 +2270,9 @@ void r100_vram_init_sizes(struct radeon_device *rdev)
+ 		/* Fix for RN50, M6, M7 with 8/16/32(??) MBs of VRAM - 
+ 		 * Novell bug 204882 + along with lots of ubuntu ones
+ 		 */
++		if (rdev->mc.aper_size > config_aper_size)
++			config_aper_size = rdev->mc.aper_size;
++
+ 		if (config_aper_size > rdev->mc.real_vram_size)
+ 			rdev->mc.mc_vram_size = config_aper_size;
+ 		else