Bug seen in current Fedora 22 - kernel 4.0.0-1.fc22.x86_64 , xorg-x11-drv-nouveau-1.0.11-2.fc22.x86_64 , xorg-x11-server-common-1.17.1-9.fc22.x86_64 , mesa-dri-drivers-10.5.1-1.20150314.fc22.x86_64 , libdrm-2.4.59-4.fc22.x86_64 . If I view a page with a lot of vertical scroll in Firefox - say, a long article, or just a page with a lot of Disqus comments - after I scroll through quite a long way, the display of the page starts corrupting. http://www.avclub.com/article/surely-you-cant-be-serious-oral-history-airplane-218043 is a good example: it starts corrupting around the "Into The Cockpit" section. I can scroll up to any point above the 'corruption cut off' and it will display just fine...but if I scroll down below it, no matter how I do it (mouse wheel, scrollbar, keys, whatever), the rendering is corrupted. https://www.happyassassin.net/temp/nouveau_scroll_corrupt.webm is a video demonstrating the corruption. The video adapter is a 01:00.0 VGA compatible controller [0300]: NVIDIA Corporation G94 [GeForce 9600 GT] [10de:0622] (rev a1) ; Ben Skeggs has one of the same model.
Probably an issue with an X pixmap that is larger than the largest allowable texture size. X pixmaps go up to 32Kx32K, while nv50-family goes up to 4K (and nvc0 goes up to 8K). If you're proficient with X tools, can you double-check that that's the case. (Not sure how you'd do it... xwininfo gives you info on windows, not pixmaps... you could look at an xtrace of it I suppose.)
I'm afraid I'd have no idea how to do that, sorry :(
-- GitLab Migration Automatic Message -- This bug has been migrated to freedesktop.org's GitLab instance and has been closed from further activity. You can subscribe and participate further through the new bug through this link to our GitLab instance: https://gitlab.freedesktop.org/xorg/driver/xf86-video-nouveau/issues/183.
Use of freedesktop.org services, including Bugzilla, is subject to our Code of Conduct. How we collect and use information is described in our Privacy Policy.