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Description of problem: Under some circumstances, X fails to redraw correctly, corrupting windows on the screen that have been exposed. The corruption shows itself as areas of underlying windows or backdrop showing through. I have a testcase now that shows the problem happening on my laptop running Gnome and my desktop running KDE. The testcase is a simple Xlib/Xrender program from comment 11 of: https://bugs.freedesktop.org/show_bug.cgi?id=22566 My laptop and my desktop both have Radeon chipset graphics cards and are both running the radeon driver. 01:00.0 VGA compatible controller: ATI Technologies Inc M22 [Mobility Radeon X300] 02:00.0 VGA compatible controller: ATI Technologies Inc Mobility Radeon HD 3600 Series Version-Release number of selected component (if applicable): Multiple. The bug has been around over a year and on previous versions of Fedora. The problem became noticeable after Fedora switched to KDE4. The version I'm reproducing it on: libXrender-0.9.6-1.fc14.x86_64 libXrender-0.9.6-1.fc14.i686 libX11-1.3.4-3.fc14.x86_64 libX11-1.3.4-3.fc14.i686 xorg-x11-server-Xorg-1.9.4-1.fc14.x86_64 xorg-x11-drv-ati-6.13.1-0.4.20100705git37b348059.fc14.x86_64 How reproducible: 100% Steps to Reproduce: 1. Grab the attached testcase program (as /tmp/holer.c). 2. Set your display size in the macros near the top of the file. 3. make holer LDLIBS="-lX11 -lXrender" 4. run for a short while. Actual results: Bleed through from stuff underlying windows that become uncovered, corrupting what you can see of the exposed windows. Expected results: The redraw should fill in the exposed regions from the uppermost remaining window. Additional info:
Created attachment 485812 [details] Before running holer This is a snapshot of my desktop before running holer
Created attachment 485813 [details] Desktop after running holer This is what my desktop looks like after running holer for a few seconds.
Created attachment 485815 [details] holer.c: the testcase The testcase, obtained from comment 11 of https://bugs.freedesktop.org/show_bug.cgi?id=22566
Created attachment 485816 [details] Desktop X server log
Created attachment 485817 [details] Desktop dmesg
Created attachment 485877 [details] Desktop X config
I've now got an NVidia card in my system and it shows the same problem with that, both with nouveau driver and NVidia's own driver. I'm now running the following packages: kernel-2.6.35.14-95.fc14.x86_64 xorg-x11-server-Xorg-1.9.5-1.fc14.x86_64 xorg-x11-drv-nouveau-0.0.16-11.20100826git065576d.fc14.x86_64 [ 73.279] (--) NOUVEAU(0): Chipset: "NVIDIA NVc3" 02:00.0 VGA compatible controller: nVidia Corporation Device 0dc4 (rev a1)
I've now upgraded to F15 and I still see it there. I'm using the following packages: kernel-2.6.40.3-0.fc15.x86_64 xorg-x11-server-Xorg-1.10.3-1.fc15.x86_64 xorg-x11-drv-nouveau-0.0.16-24.20110324git8378443.fc15.x86_64
There's a potential fix posted: http://article.gmane.org/gmane.comp.freedesktop.xorg.devel/25664
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