[Nouveau] [Bug 90145] New: [NV94] Corruption on very long (vertical) pages in Firefox

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=90145

            Bug ID: 90145
           Summary: [NV94] Corruption on very long (vertical) pages in
                    Firefox
           Product: xorg
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/nouveau
          Assignee: nouveau at lists.freedesktop.org
          Reporter: adamw at happyassassin.net
        QA Contact: xorg-team at lists.x.org

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.

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