Nouveau - Apr 2015 - [Bug 90145] New: [NV94] Corruption on very long (vertical) pages in Firefox

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

--- Comment #1 from Ilia Mirkin <imirkin at alum.mit.edu> ---
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.)

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--- Comment #2 from Adam Williamson <adamw at happyassassin.net> ---
I'm afraid I'd have no idea how to do that, sorry :(

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Martin Peres <martin.peres at free.fr> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |MOVED

--- Comment #3 from Martin Peres <martin.peres at free.fr> ---
-- 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.

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