https://bugzilla.novell.com/show_bug.cgi?id=464512
User sndirsch@novell.com added comment
https://bugzilla.novell.com/show_bug.cgi?id=464512#c13
--- Comment #13 from Stefan Dirsch 2009-01-15 04:26:45 MST ---
http://blog.sayakbanerjee.com/?p=77#comment-62
xorg-server_1.5.2-2ubuntu3.diff.gz
[...]
---
xorg-server-1.5.2.orig/debian/patches/107_fedora_dont_backfill_bg_none.patch
+++ xorg-server-1.5.2/debian/patches/107_fedora_dont_backfill_bg_none.patch
@@ -0,0 +1,23 @@
+Disable backfilling of windows created with bg=none, which otherwise
+would force a framebuffer readback.
+
+Index: xorg-server-1.2.0/composite/compalloc.c
+===================================================================
+--- foo/composite/compalloc.c.orig 2007-09-18 18:16:24.000000000 -0700
++++ foo/composite/compalloc.c 2007-09-18 18:16:48.000000000 -0700
+@@ -471,6 +471,7 @@ compNewPixmap (WindowPtr pWin, int x, in
+ pPixmap->screen_x = x;
+ pPixmap->screen_y = y;
+
++#if 0
+ if (pParent->drawable.depth == pWin->drawable.depth)
+ {
+ GCPtr pGC = GetScratchGC (pWin->drawable.depth, pScreen);
+@@ -529,6 +530,7 @@ compNewPixmap (WindowPtr pWin, int x, in
+ if (pDstPicture)
+ FreePicture (pDstPicture, 0);
+ }
++#endif
+ return pPixmap;
+ }
+
We don't use such a patch. I verified that our sources don't have these lines,
which backfill windows created with bg=none, disabled.
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