|Summary:||[Pineview GM] [UXA] display corruption when rendering dynamic HTML|
|Product:||xorg||Reporter:||Thierry Reding <thierry.reding>|
|Component:||Driver/intel||Assignee:||Chris Wilson <chris>|
|Status:||RESOLVED FIXED||QA Contact:||Xorg Project Team <xorg-team>|
|i915 platform:||i915 features:|
Description Thierry Reding 2012-03-15 04:05:39 UTC
Created attachment 58491 [details] Xorg log I've been seeing display corruption under some circumstances for some time now. The issue can be easily reproduced with the attached reduced test case, although it is not as reduced as I would have liked. The test case is from a phone number dialing application. The corruption usually happens after entering or clearing some numbers. I'm attaching a screenshot of a case where the corruption is visible. I'm also attaching the output of lspci and the Xorg.log. I'm using the Linux kernel 3.1.10. While investigating, I tried several of the options listed in the X driver's manpage and noticed that the problem goes away when I put the following in a file in the xorg.conf directory: Section "Device" Driver "intel" Identifier "intel" Option "DebugFlushBatches" "true" EndSection Also it seems like the corruption cannot be reproduced when using SNA. However SNA turned out to be somewhat unstable, but that should go into a separate bug report. Thierry
Comment 1 Thierry Reding 2012-03-15 04:06:16 UTC
Created attachment 58492 [details] output of lspci -vv
Comment 2 Thierry Reding 2012-03-15 04:10:18 UTC
Created attachment 58493 [details] reduced testcase With this test-case I can reproduce the issue easily using the GtkLauncher from WebKitGtk 1.7.5.
Comment 3 Thierry Reding 2012-03-15 04:11:03 UTC
Created attachment 58494 [details] screenshot of the corruption
Comment 4 Chris Wilson 2012-03-15 04:19:15 UTC
The corruption is the line join the baseline of the "2222" and the rainbow line inside the textbox, right?
Comment 5 Thierry Reding 2012-03-15 04:29:38 UTC
(In reply to comment #4) > The corruption is the line join the baseline of the "2222" and the rainbow line > inside the textbox, right? Yes. Although the corruption can be different. I've seen problems where there's only the rainbow line, and the line width varies. Sometimes, though much less often, it can also happen that the frame around the textbox gets "displaced" downwards by some pixels, such that the top of the frame is doubled. If it helps I can try to get a screenshot of that particular case. Thierry
Comment 6 Chris Wilson 2012-03-15 04:34:10 UTC
In http://cgit.freedesktop.org/~ickle/xf86-video-intel/log/?h=uxa I've put some patches to dumb down UXA slightly. Can you apply those and see if the removal of the extra layer of caching prevents this corruption?
Comment 7 Thierry Reding 2012-03-15 05:04:35 UTC
(In reply to comment #6) > In http://cgit.freedesktop.org/~ickle/xf86-video-intel/log/?h=uxa I've put some > patches to dumb down UXA slightly. Can you apply those and see if the removal > of the extra layer of caching prevents this corruption? I checked out your uxa branch, rebuilt the driver and ran my tests again and I can no longer reproduce the corruption. I've even tested the original setup from which I reduced the test-case and I no longer see the corruption there either. One thing though: I had to remove the src/legacy directory from the driver build because it didn't compile.
Comment 8 Thierry Reding 2012-03-15 05:12:56 UTC
(In reply to comment #7) > One thing though: I had to remove the src/legacy directory from the driver > build because it didn't compile. I just remembered that this is an issue with the driver's build system in the cross-compilation setup that I have. I sent a patch for that some time ago but I think it must have gone unnoticed. I'll attach it here again for reference.
Comment 9 Thierry Reding 2012-03-15 05:16:53 UTC
Created attachment 58502 [details] [review] configure: Keep passed-in CFLAGS for DRI tests Note that this patch doesn't fix the original bug in this report but is rather a build fix for cross-compilation setups.
Comment 10 Chris Wilson 2012-03-15 05:46:33 UTC
Applied the branch and your build fix, thanks. commit 0e2fbb6a1c1ad6b0971d07a91a790b0b3236dad3 Merge: 64ccc66 84d7a82 Author: Chris Wilson <email@example.com> Date: Thu Mar 15 12:43:47 2012 +0000 uxa: Merge 'remove complicated second level caching' Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=47345 Signed-off-by: Chris Wilson <firstname.lastname@example.org> Don't forget to create a bug report for the SNA instability!