Bug 64881

Summary: Background corruption when moving window on top of pidgin chat window [SNA]
Product: xorg Reporter: Clemens Eisserer <linuxhippy>
Component: Driver/intelAssignee: Chris Wilson <chris>
Status: RESOLVED DUPLICATE QA Contact: Intel GFX Bugs mailing list <intel-gfx-bugs>
Severity: normal    
Priority: medium    
Version: git   
Hardware: Other   
OS: All   
Whiteboard:
i915 platform: i915 features:
Attachments:
Description Flags
screenshot of background corruption none

Description Clemens Eisserer 2013-05-22 22:06:43 UTC 
When moving a window on top of a pidgin chat window, the chat window is corrupted.
Happens with 2.21.7-5-g87295b1 and SNA on my SNB powered notebook (Fedora 19 beta)
Comment 1 Clemens Eisserer 2013-05-22 22:07:42 UTC 
Created attachment 79684 [details]
screenshot of background corruption
Comment 2 Clemens Eisserer 2013-05-22 22:13:26 UTC 
happens also with 2.21.7, if you can not reproduce it I'll try to bisect.
Comment 3 Chris Wilson 2013-05-23 10:01:05 UTC 
The big scary change would be the introduction of cow support. To test, you can disable it with:

diff --git a/src/sna/sna_accel.c b/src/sna/sna_accel.c
index 371abb0..fc82e09 100644
--- a/src/sna/sna_accel.c
+++ b/src/sna/sna_accel.c
@@ -68,7 +68,7 @@
 #define USE_CPU_BO 1
 #define USE_USERPTR_UPLOADS 1
 #define USE_USERPTR_DOWNLOADS 1
-#define USE_COW 1
+#define USE_COW 0
 
 #define MIGRATE_ALL 0
 #define DBG_NO_CPU_UPLOAD 0

*** This bug has been marked as a duplicate of bug 64841 ***

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