Created attachment 31446 [details] Screenshot of corruption in top-left corner I'm seeing corruption in the top left corner of the screen on my 9800M. It happened when I updated the xorg driver and libdrm, and I couldn't quite bisect it or even find which one caused it because the relevant commits involve a libdrm API change (commit f4c50630269df4201b89a538cbf8e11646f17d82). The age of the DRM module doesn't seem to matter. It's hard to get a screenshot of because it's transient and goes away whenever that corner gets redrawn, but I got a decent one which is attached. It shows basically all the symptoms: random black rectangles, random colors, and other parts of the screen being drawn there. For example, scrolling in firefox often causes parts of the scrollbar to be drawn there (that's what the vertical stripes in the screenshot are). I've also seen an animated image that was off the screen in firefox show up there, fully animated and zoomed in for some reason.
Never mind, it seems this only happens when using the nouveau DRI driver, which I installed system-wide for no good reason and then forgot about. It seems to work great when using the software rasterizer and XRender compositing. I'll reopen this if I see it again without the nouveau DRI driver in use.
Sorry guys, I'm reopening this as I'm still seeing the same problem, it seems not as frequently now.
Looks like this is fixed in the latest GIT, probably by all the changes that got merged in recently.
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