linux-kernel - [PATCH] ignore vgacon if hardware not present

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Date:	Thu, 29 Mar 2007 17:46:48 +1000
From:	Rusty Russell <rusty@...tcorp.com.au>
To:	Andi Kleen <ak@....de>, Andrew Morton <akpm@...ux-foundation.org>
Cc:	Jeremy Fitzhardinge <jeremy@...source.com>,
	Gerd Hoffmann <kraxel@...e.de>,
	Alan <alan@...rguk.ukuu.org.uk>, Ingo Molnar <mingo@...e.hu>,
	lkml - Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: [PATCH] ignore vgacon if hardware not present

(Did this fall through the cracks?  I don't see it in -mm.  It's
standalone, and saves some silly code in lguest and presumably others).
==

Avoid trying to set up vgacon if there's no vga hardware present.

Signed-off-by: Jeremy Fitzhardinge <jeremy@...source.com>
Signed-off-by: Rusty Russell <rusty@...tcorp.com.au>
From: Gerd Hoffmann <kraxel@...e.de>
Cc: Alan <alan@...rguk.ukuu.org.uk>
Acked-by: Ingo Molnar <mingo@...e.hu>

---
 drivers/video/console/vgacon.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

===================================================================
--- a/drivers/video/console/vgacon.c
+++ b/drivers/video/console/vgacon.c
@@ -372,7 +372,8 @@ static const char *vgacon_startup(void)
 	}
 
 	/* VGA16 modes are not handled by VGACON */
-	if ((ORIG_VIDEO_MODE == 0x0D) ||	/* 320x200/4 */
+	if ((ORIG_VIDEO_MODE == 0x00) ||	/* SCREEN_INFO not initialized */
+	    (ORIG_VIDEO_MODE == 0x0D) ||	/* 320x200/4 */
 	    (ORIG_VIDEO_MODE == 0x0E) ||	/* 640x200/4 */
 	    (ORIG_VIDEO_MODE == 0x10) ||	/* 640x350/4 */
 	    (ORIG_VIDEO_MODE == 0x12) ||	/* 640x480/4 */


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