From 82069552555cf951d9ade5c1aec61dd40b0765b5 Mon Sep 17 00:00:00 2001
From: Zhang Rui <rui.zhang@intel.com>
Date: Mon, 6 Dec 2010 15:04:24 +0800
Subject: ACPI video: check cap._DDC flag before getting EDID

cap._DDC is defined but never used.
Check this flag now and don't try to get EDID for video output devices with this flag cleared.

Signed-off-by: Zhang Rui <rui.zhang@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>

diff --git a/drivers/acpi/video.c b/drivers/acpi/video.c
index 81766eb..177b4ddc 100644
--- a/drivers/acpi/video.c
+++ b/drivers/acpi/video.c
@@ -1275,6 +1275,9 @@ int acpi_video_get_edid(struct acpi_device *device, int type, int device_id,
 		if (!video_device)
 			continue;
 
+		if (!video_device->cap._DDC)
+			continue;
+
 		if (type) {
 			switch (type) {
 			case ACPI_VIDEO_DISPLAY_CRT:
-- 
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