x11-base/xorg-server/files/1.12.4-Skip-SetCursor-when-vtSema.patch

From 78fe797d3660790f83a2f036c3306fc2ccaeaa35 Mon Sep 17 00:00:00 2001
From: Yogish Kulkarni <yogishk@nvidia.com>
Date: Tue, 21 Oct 2014 14:13:42 +0530
Subject: [PATCH 1/1] Skip SetCursor when !vtSema.

Consider below sequence -
1) Cursor is removed : isUp will be FALSE if HW cursor is set.
2) VT switched away from X : vtSema becomes FALSE.
3) xf86CursorSetCursor is called with non-null CursorPtr :
Saves the passed in CursorPtr, fallbacks to SW cursor and invokes
spriteFuncs->SetCursor which saves the area under cursor and restores
the cursor. This sets isUp to TRUE and as vtSema is FALSE saved data
is garbage.
4) VT switched to X : vtSema becomes TRUE. xf86Cursor enable fb access
is called which will remove the SW cursor, i.e copies saved data in #3
to screen.

This results to momentary garbage data on screen. Hence when !vtSema
skip spriteFuncs->SetCursor.
---
 hw/xfree86/ramdac/xf86Cursor.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/hw/xfree86/ramdac/xf86Cursor.c b/hw/xfree86/ramdac/xf86Cursor.c
index 4a4def5..98edb88 100644
--- a/hw/xfree86/ramdac/xf86Cursor.c
+++ b/hw/xfree86/ramdac/xf86Cursor.c
@@ -333,8 +333,10 @@ xf86CursorSetCursor(DeviceIntPtr pDev, ScreenPtr pScreen, CursorPtr pCurs,
         ScreenPriv->HotX = pCurs->bits->xhot;
         ScreenPriv->HotY = pCurs->bits->yhot;
 
-        if (!infoPtr->pScrn->vtSema)
+        if (!infoPtr->pScrn->vtSema) {
             ScreenPriv->SavedCursor = pCurs;
+            return;
+        }
 
         if (infoPtr->pScrn->vtSema &&
             (ScreenPriv->ForceHWCursorCount ||
-- 
1.8.1.5