From 720f302d241e88e6e9f2962207da1aa9a79728b7 Mon Sep 17 00:00:00 2001
From: Keith Packard <keithp@neko.keithp.com>
Date: Sat, 17 Mar 2007 20:14:05 -0700
Subject: [PATCH] Slow down DDC I2C bus using a RiseFallTime of 20us for old
 monitors.

This time value makes the bus run slowly enough for even the least reliable
of monitors. Thanks to Pavel Troller for finding the necessary change.
---
 hw/xfree86/ddc/xf86DDC.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/hw/xfree86/ddc/xf86DDC.c b/hw/xfree86/ddc/xf86DDC.c
index 0f24c520e..8080c8d2a 100644
--- a/hw/xfree86/ddc/xf86DDC.c
+++ b/hw/xfree86/ddc/xf86DDC.c
@@ -337,6 +337,12 @@ DDCRead_DDC2(int scrnIndex, I2CBusPtr pBus, int start, int len)
     unsigned char *R_Buffer;
     int i;
     
+    /*
+     * Slow down the bus so that older monitors don't 
+     * miss things.
+     */
+    pBus->RiseFallTime = 20;
+    
     if (!(dev = xf86I2CFindDev(pBus, 0x00A0))) {
 	dev = xf86CreateI2CDevRec();
 	dev->DevName = "ddc2";