From afae8b229bd1b7e2dd8b92bdcee4dc89224bf32d Mon Sep 17 00:00:00 2001
From: Paulo Flabiano Smorigo <pfsmorigo@br.ibm.com>
Date: Tue, 11 Jun 2013 15:14:05 -0300
Subject: [PATCH] Disable GRUB video support for IBM power machines

Should fix the problem in bugzilla:
https://bugzilla.redhat.com/show_bug.cgi?id=973205
---
 grub-core/kern/ieee1275/cmain.c  | 5 ++++-
 grub-core/video/ieee1275.c       | 9 ++++++---
 include/grub/ieee1275/ieee1275.h | 2 ++
 3 files changed, 12 insertions(+), 4 deletions(-)

diff --git a/grub-core/kern/ieee1275/cmain.c b/grub-core/kern/ieee1275/cmain.c
index 3e12e6b24e1..3e14f539368 100644
--- a/grub-core/kern/ieee1275/cmain.c
+++ b/grub-core/kern/ieee1275/cmain.c
@@ -90,7 +90,10 @@ grub_ieee1275_find_options (void)
   }
 
   if (rc >= 0 && grub_strncmp (tmp, "IBM", 3) == 0)
-    grub_ieee1275_set_flag (GRUB_IEEE1275_FLAG_NO_TREE_SCANNING_FOR_DISKS);
+    {
+      grub_ieee1275_set_flag (GRUB_IEEE1275_FLAG_NO_TREE_SCANNING_FOR_DISKS);
+      grub_ieee1275_set_flag (GRUB_IEEE1275_FLAG_DISABLE_VIDEO_SUPPORT);
+    }
 
   /* Old Macs have no key repeat, newer ones have fully working one.
      The ones inbetween when repeated key generates an escaoe sequence
diff --git a/grub-core/video/ieee1275.c b/grub-core/video/ieee1275.c
index 17a3dbbb575..b8e4b3feb32 100644
--- a/grub-core/video/ieee1275.c
+++ b/grub-core/video/ieee1275.c
@@ -352,9 +352,12 @@ static struct grub_video_adapter grub_video_ieee1275_adapter =
 
 GRUB_MOD_INIT(ieee1275_fb)
 {
-  find_display ();
-  if (display)
-    grub_video_register (&grub_video_ieee1275_adapter);
+  if (! grub_ieee1275_test_flag (GRUB_IEEE1275_FLAG_DISABLE_VIDEO_SUPPORT))
+    {
+      find_display ();
+      if (display)
+        grub_video_register (&grub_video_ieee1275_adapter);
+    }
 }
 
 GRUB_MOD_FINI(ieee1275_fb)
diff --git a/include/grub/ieee1275/ieee1275.h b/include/grub/ieee1275/ieee1275.h
index 2310f33dbc2..ca08bd96681 100644
--- a/include/grub/ieee1275/ieee1275.h
+++ b/include/grub/ieee1275/ieee1275.h
@@ -146,6 +146,8 @@ enum grub_ieee1275_flag
   GRUB_IEEE1275_FLAG_BROKEN_REPEAT,
 
   GRUB_IEEE1275_FLAG_CURSORONOFF_ANSI_BROKEN,
+
+  GRUB_IEEE1275_FLAG_DISABLE_VIDEO_SUPPORT
 };
 
 extern int EXPORT_FUNC(grub_ieee1275_test_flag) (enum grub_ieee1275_flag flag);